Egyptian Art

They dedicated enormous resources to Egyptian rituals and the construction of temples. Because of their beliefs, they developed an exquisite and unique form of art. Their art works centered on their gods and the preparation for eternal life after death. They created sculptures, forms of pottery, paintings and hieroglyphs to decorate burial tombs for their eternal afterlife Journey. This civilization is the most well known for their monumental sculptures, but they also created small sculptures made of stone, wood, and bronze.These were often a suture of a human body with the head of an animal (falcons). They were also known for their astonishing pottery made out of clay which held images of animals, people, and last but not least; their gods. (Above, we can observe an image of the kneeling figure/sculpture of Hatchets. This image is located in page 67 or our eBook – Art: A Brief History. The actual sculpture can be found at the Metropolitan Museum of Art in New York). The great Sphinx of Gaza is probably one of the most mysterious monuments in the world today.The Great Sphinx is located near modern-day Cairo Egypt and is a lion with a man's head, which is thought to be the head of the Pharaoh Cheapen – the fourth king of the 4th Dynasty is believed to have been the brother or son of Cheeps, but the only problem is that there is no evidence that this temple was in fact built by Pharaoh Cheapen as there are no artifacts or identifying inscriptions of any kind. This isomorphic mythological figure has its origins in sculpted figures from Old Kingdom Egypt and it was the Greeks who named it â€Å"Sphinx† which in Greek hydrology meant: female monster or strangler.The Egyptians basically told us everything about them through their art. Their art revealed to us their beliefs and ways of life. Their art also revealed to us about economical and political changes of their time and so much more. References: Stoked, Coterie (2010). Art: A Brief History – 4th Edition. Pearson Education – up 56 – 75. Http://www. Schenectady. Org/humanities/art-history/art-history-400-c-e–ancient- cultures- 1 [ancient-Egypt/a/Egyptian-art http://www. Crystalline. Com/sphincters. HTML

Math Self-efficacy

Math Self-efficacy 1 Running head: SELF-EFFICACY AND STANDARDIZED TEST PERFORMANCE Accepted for publication in the Journal of Educational Psychology. This version may slightly differ from the published version. Does Math Self-efficacy Mediate the Effect of the Perceived Classroom Environment on Standardized Math Test Performance? Lisa A. Fast University of California, Riverside James Lewis University of California, Riverside Michael J. Bryant California Institute of the Arts Kathleen A. Bocian University of California, Riverside Richard A.Cardullo University of California, Riverside Michael Rettig University of California, Riverside Kimberly A. Hammond University of California, Riverside Math Self-efficacy 2 Abstract We examined the effect of the perceived classroom environment on math self-efficacy and the effect of math self-efficacy on standardized math test performance. Upper elementary school students (n = 1163) provided self-reports of their perceived math selfefficacy and the degree to which their math classroom environment was masteryoriented, challenging, and caring. Individual student scores on the California Standards Test for Mathematics were also collected.A series of two-level models revealed that students who perceived their classroom environments as more caring, challenging, and mastery-oriented had significantly higher levels of math efficacy, and higher levels of math efficacy positively predicted math performance. Analysis of the indirect effects of classroom variables on math performance indicated a small significant mediating effect of self-efficacy. Implications for research on self-efficacy and the perceived classroom environment are discussed. Math Self-efficacy 3 Does Math Self-efficacy Mediate the Effect of the Perceived Classroom Environment on Standardized Math Test Performance?In the current high-stakes testing environment, any attribute of a student that positively influences achievement is of interest. The degree to which a studen t believes that he/she is capable of performing specific tasks, referred to as self-efficacy, is particularly relevant given that self-efficacy has been argued to have powerful effects on achievement behavior (Bandura, 1986). Those with higher self-efficacy are proposed to have higher aspirations, stronger commitments to their goals, and recover more quickly from setbacks than those lower in self-efficacy. Beliefs in one’s efficacy can vary across academic subjects (e. . reading vs. writing) and self-efficacy for mathematics has received close attention. Students with higher math self-efficacy persist longer on difficult math problems and are more accurate in math computations than those lower in math self-efficacy (Collins, 1982; Hoffman & Schraw, 2009). Math self-efficacy is also a stronger predictor of math performance than either math anxiety or previous math experience (Pajares & Miller, 1994; Pajares & Miller, 1995, respectively) and influences math performance as stron gly as overall mental ability (Pajares & Kranzler, 1995).The demonstrated importance of self-efficacy in academic achievement has provoked widespread interest in specific factors that affect a student’s self-efficacy beliefs. Bandura’s (1997) social-cognitive theory proposed that self-efficacy is most strongly affected by one’s previous performance and research largely supports this (Chen & Zimmerman, 2007). His theory also suggests that self-efficacy is affected by observing others (e. g. watching peers succeed at a task), verbal persuasion (e. g. encouragement from parents and teachers), and interpretation of physiological states (e. g.Math Self-efficacy 4 lack of anxiety may be a signal that one possesses skills). Although several studies indicate that manipulating features of learning environments along these theoretical premises has immediate and detectable effects on self-efficacy (Schunk, 1982, 1983, 1984; Schunk & Hanson, 1985), it seems possible that st udents’ perceptions of their learning environments also affect their efficacy beliefs. Ames (1992) argued that learning environments may not provide a common experience for all students and that students’ subjective interpretations of their environment determine how they respond to it.For example, a teacher might be described by an objective observer as helpful, but if a student perceives him/her as unhelpful, then the perception of unhelpfulness will guide the students’ behavior more than the teachers’ actual helpfulness. Focusing on perceptions of the classroom environment is consistent with Bandura’s (1997) theory, which suggests that self-efficacy is influenced by how an individual interprets relevant information. For example, a student might interpret a perceived unhelpful teacher as evidence that he/she lacks ability.In the current study, we focus on three aspects of the perceived classroom environment that affect self-efficacy: Mastery-orien tation, Challenge, and Caring. The degree to which students perceive their classroom environment as one that encourages mastery versus performance goals has been prominently studied (Ames, 1992; Dweck, 1986; Maehr & Nicholls, 1980, respectively). Classrooms structured around mastery goals emphasize effort and the intrinsic value of learning; students who adopt mastery goals are more likely to believe that effort leads to success (Weiner, 1979) and display positive attitudes towards learning (Ames & Archer, 1988).In contrast, classrooms structured around performance goals emphasize ability and competition Math Self-efficacy 5 between peers; students who adopt performance goals are more likely to use shallow learning strategies (Meece et al. , 1988) and avoid challenging tasks (Dweck, 1986). Although both of these classroom goal structures theoretically influence the achievement goals that students adopt, only mastery goal structures are consistently related to selfefficacy.Several st udies have found that students who perceive their classroom environment as more mastery oriented have higher academic self-efficacy (Dorman, 2001; Friedel et al. , 2007; Middleton & Midgley, 1997), whereas performance oriented classrooms have been found to be unrelated, positively related, and negatively related to self-efficacy (Friedel et al. , 2007; Wolters et al. , 1996; Schunk, 1996, respectively). Studies using path analysis have also found that self-efficacy mediates the influence of mastery-oriented classrooms on performance (Bong, 2008; Greene, Miller, Crowson, Duke, & Akey, 2004).In particular, Wolters (2004) found that mastery goal structure had a significant positive effect on students’ math grades, but when math self-efficacy was included in the model, the effect of mastery structure on course grades became nonsignificant. The degree to which a classroom environment is perceived as challenging also influences self-efficacy. A challenging environment is one in whi ch students are provided with progressively difficult tasks as their proficiency increases. Vygotsky (1978) argued that challenge is essential for intellectual development and Grolnick et al. 2002) proposed that individuals are born with a need to test their abilities and master their environment. Accordingly, evidence indicates that students enjoy learning when tasks are challenging (Zahorik, 1996). Although challenge has been most prominently discussed as an important facilitator of intrinsic motivation (e. g. Malone & Lepper, Math Self-efficacy 6 1987), some researchers suggest that it also leads to stronger beliefs in one’s academic abilities (Meyer, Turner, & Spencer, 1997; Stipek, 2001).Participating in challenging activities allows students to notice their incremental improvement in a subject, which increases feelings of self-competence. In support of this, Gentry and Owen (2004) reported that middle and high school students who perceived their classroom as challenging were more likely to have higher academic self-efficacy. Similarly, Meyer, Turner, & Spencer (1997) found that fifth and sixth-grade students who were characterized as â€Å"challenge-seekers† had higher math self-efficacy, while students who were characterized as â€Å"challenge-avoiders’ had lower math self-efficacy.Finally, the degree to which students perceive their classroom as a caring environment also has an important influence on self-efficacy. In a caring classroom (also referred to as Teacher Involvement: Newman, 2002; Personalization: Frasier & Fisher, 1982), the teacher expresses personal interest in students, provides emotional support, and generally creates a comfortable atmosphere. Murdock and Miller (2003) suggest that students who perceive their teachers as caring are more likely to view themselves as academically capable and set higher educational goals for themselves.Positive relationships between students and teachers provide a critical development al resource for children; students are more likely to seek help when they need it and develop a wide range of competencies when they feel emotionally supported by their teachers (Crosnoe, Johnson, & Elder, 2004; Pianta, Hamre, & Stuhlman, 2003). Accordingly, evidence suggests that students who perceive their teachers as more caring have significantly higher academic self-efficacy (Murdock & Miller, 200; Patrick et al. , 2007). Pianta et al. (2008) also found that fifth-grade students had higher performance on math tests whenMath Self-efficacy 7 their classrooms were rated higher in emotional support. In addition, the effect of emotional support on math achievement was larger than the effect of quantity of math instruction. The authors noted that, â€Å"this is especially interesting because math is perhaps not a subject where teacher-student relations are as much a focus,† (Pianta et al. , 2008, p. 389). In summary, math self-efficacy appears to play an important role in math achievement and mediates the influence of mastery-oriented classroom environments on math achievement.Global academic self-efficacy also seems to be positively affected by caring and challenging classroom environments. However, several issues remain unclear. Little is known either about the influence of caring and challenging classroom environments specifically on math self-efficacy or whether math self-efficacy mediates the influence of challenging and caring classroom environments on math achievement. Further, virtually nothing is known about the relationships between math self-efficacy, perceived classroom environment, and achievement in the context of standardized math test performance.These are important gaps in the literature in light of the No Child Left Behind (NCLB) Act of 2002 that requires all students to take standardized math tests annually in grades 3 through 8 and once during high school. Scores on these tests are increasingly being used for â€Å"high-stakes† purposes that affect both students and teachers. According to the National Center for Fair and Open Testing (2007), standardized test scores of fourth, fifth, and sixth graders can be used for the following purposes in California: to place students into instructional groups (e. . remedial or special education programs), determine school eligibility for federal funding, make decisions about whether principals, Math Self-efficacy 8 teachers, and staff are offered continued employment, and determine whether or not teachers get bonuses. Several researchers have argued that the implementation of NCLB has led to a focus on testing and evaluation that permeates the school environment (Meece, Anderman, & Anderman, 2006; Ryan et al. , 2007). It is important to examine how student motivation (e. g. elf-efficacy) and classroom environments are related to one another in this legislated performance-oriented environment. In the current study, we predicted that math self-efficacy mediates the inf luence the perceived of classroom environment on standardized math test performance (Figure 1). Specifically, we predict that students’ perceptions of the degree to which their classroom environment is mastery-oriented, challenging, and caring has a direct and positive influence on math self-efficacy, and math self-efficacy has a direct and positive effect on student performance on standardized math tests.Each of these three aspects of the classroom environment will positively affect self-efficacy for the following reasons. Mastery-orientation will have a positive influence on math self-efficacy because environments that encourage students to take pride in their effort and value learning for its own sake, rather than simply emphasize the importance of good grades, will allow students to feel more confident in their ability.Challenge will also be associated with higher math self-efficacy because being afforded the opportunity to progressively master tasks that are slightly bey ond one’s current capacity allows a student to observe his/her own progress and gradually increase beliefs in his/her ability. Finally, caring will have a positive influence on math self-efficacy because Bandura (1993) argued that affective processes affect self-efficacy. In particular, environments that arouse anxiety and other negative emotions have a negative affect on efficacy beliefs (Usher, 2009).We Math Self-efficacy 9 hypothesize that environments in which teachers take a personal interest in and emotionally support students are less likely to arouse negative emotions than environments in which teachers are impersonal and emotionally disconnected, and therefore caring environments will positively affect self-efficacy. Methods Participants The 1,163 participants in our study were fourth, fifth, and sixth graders who attended elementary school in an inland southern California suburban school district during the 2005-06 and 2006-07 academic years.The schools were located in low to middle income neighborhoods, with 59% (n = 682) of our participants receiving free and/or reduced lunch. Participants came from 88 separate classrooms. The mean cluster size was 13. 22 (SD = 5. 95) and ranged from 2 to 25 students per classroom. The majority of our sample consisted of Latino/a (62%) and Caucasian (31%) students and other ethnic groups included African American (4%), Asian (1%), Pacific Islander (

Abnormally Normal

All the college help websites say that the trick to a butt-kicking college essay is to be yourself. And yet, the whole point is to impress whosever reading it, because the overall goal is to stand out. I’ve been reading different samples, just trying to get a spark of inspiration (don’t worry, no plagiarism was involved), but to be honest, I can’t relate any of these â€Å"top-rated college essays† to my own life. I’ve never had a friend killed by a drunk driver, or a parent devoured by some horrific disease. I am not a Guitar Hero champion or a red headed, left-handed sextuplet. I am, for all intents and purposes, normal. Strange though†¦I never thought I would be saying that. A true Barbie fanatic as a child, my idea of normal was the â€Å"Pleasantville† household: a squeaky clean suburban house, 2 kids, a cat, high school sweetheart parents, a doctor/lawyer father and a stay-at-home mom of course. Growing up in an Ivy-league collegetown, there was certainly a lot of this around, which definitely colored my perception. But basically, I had the opposite of this. My house was, and still is, a hundred-year old death trap; there is a surplus of holes in the ceiling and in the walls, exposed electrical wiring, creaking with every step, and no railing on the stairs. My only siblings are my four dogs, which are really more like shedding babies; they cry, pee and poop all over the house, and occasionally bite, but you love them anyways. And then there’s my parents†¦I won’t say too much because I don’t want to embarrass them, but let’s just say they’re not the Barbie and Ken couple previously described. It was truly traumatic in my eleven-year old eyes; in my â€Å"the world revolves around me† phase, I thought I was the weirdo of the town. In my mind I was just the girl who wouldn’t invite anybody over or the girl with the dad who looks like Jack Skeleton (completely self-afflicted, by the way). Now as I am trying to write an interesting college admissions essay, and I read samples about watching somebody die, and am denied certain scholarships because I have never been a golf caddy, I, for the first time, realize how utterly â€Å"normal† I am. Maybe I live in less-desirable home, but we can afford to take amazing trips to Germany to visit family. Maybe I don’t have a litter box trained cat or a little sister, but I have four energetic fluff-balls that will always comfort me when I’m sad. Maybe I don’t have a mom who will make me a 4 star breakfast in the morning, but at the end of the day, I know that I have two loving parents that will help me proof read this essay and will continue to support me.

Does Government secure or inhibit liberty Essay

Does Government secure or inhibit liberty - Essay Example Liberty looks at the right of the mother who exercised her right to abortion but did not take into consideration the baby’s right to life. The utilitarian approach looks at non-abortion as not being cost-effective on the part of the State and taxpayers in general, by the provision of health care and being wards of the State, respectively for the mother and would be child. Richard Garlikov, in his article â€Å"the Abortion Debate† stated that â€Å"Many states allow abortion in cases of rape, incest, or danger to the life or health of the pregnant woman. Normally no rationale is given for that because, apparently many people think none is needed or that the rationales are obvious.   I prefer to spell out the rationales in those cases, however, because I think they are important to understand in their own right, and because I think they also have consequences for other cases†. In 1973 the Roe v. Wade decision proved this by recognizing abortion as a fundamental constitutional right and made it legal in all states. The law now permits abortion at the request of the women without any restrictions in the first trimester and some restrictions in the second trimester to protect women's health. ... How can we allow people the right to do everything that leads to contraception, but not allow abortion? Accidents do happen. Most cases of abortions are due to unplanned pregnancies. In the case of rape, women most likely do not want the child. Banning abortion would force these women to live with burden of an unwanted child. Even if one were to pose the argument that the child could be put up for adoption, there is still the state of mind of the mother to consider. The mother will most likely live with a guilty conscious and the memory of bearing a bastard child. Simply, because she was denied the liberty of ridding herself of an unborn entity. Also, in exploring cases of teenagers, young adults are now having sex with no serious thinking into the consequences of them becoming pregnant. Denying her the right to abortion the child's life may inexplicably ruin her future. She    most likely will have a traumatic pregnancy simply because she is too young to have a rational notion of parenthood as well as the possibility of her not having a higher education. Women should have the right to their bodies, and they should have a choice whether or not to have an abortion. Garlikov also posited that â€Å"each embryo is a particular individual that has the potential to become, in a relatively short time, a particular person. Conception is a rather miraculous, complex event and it seems that, at the very least, unnecessary, unjustified abortion is in some sense insensitively wasteful, and unappreciative of the event and of the value of each particular individual character that is already, by virtue of conception, partly along the path to becoming a particular person. Life, because it can be good, is not

General Electric Case Study Example | Topics and Well Written Essays - 2750 words

General Electric - Case Study Example One such company is Sanyo Epson. ISO 14031 is used globally to evaluate organisations in the "manufacturing, health services, transportation, electric utility and municipal sectors in order to evaluate environmental performance (EPE), provide a basis for performance benchmarking, demonstrate compliance to regulations and increase operational efficiency" (ISO 14031, par. 1) It assists organisations to obtain ISO 14001 certification. Other companies, for instance, General Electric, have focused their efforts mostly inward, with the integration of high-tech programs to track their progress. In today's business environment, performance measurement relates to all aspects of business from leadership to management to employees to customers. It is a method by which company output, brand recognition, cooperation and interaction with other companies are measured. Because GE has expanded its product line to include almost every area of manufacturing, a successful environmental management progra m must be able to cover every phase of their business, from supply chain to operations to marketing. GE has the broadest array of infrastructure products, services and financing in the world, "from Energy to Aviation to Transportation to Water to Oil & Gas" (General Electric 2006, p.

How global warming affects sea levels Research Paper

How global warming affects sea levels - Research Paper Example Essentially, the greenhouse effect functions in the following manner. When sunlight pierces the atmosphere and hits the earth’s surface, not all of the sun’s solar energy is absorbed. Approximately a third of it is reflected back into space. Specific atmospheric gases serve in much the same way as does the glass of a greenhouse, thus the terminology. These gases allow sunlight to penetrate then trap some of the solar energy which heats the earth (Breuer, 1980). It is a delicate balance and because these greenhouse gases have been artificially augmented by man-made sources, more build up in the atmosphere has occurred thus trapping more of the sun’s energy and reflecting less back in to space. This occurrence is causing the earth to warm. The rising levels of carbon dioxide (CO2) in the atmosphere are becoming increasingly disconcerting. â€Å"The concentrations of CO2 in the air around 1860 before the effects of industrialization were felt, is assumed to have been about 290 parts per million (ppm). In the hundred years and more since then, the concentration has increased by about 10 percent.† (Breuer, 1980, p. 67). Eighty percent of the world’s population accounts for just 35 percent of CO2 emissions while the United States and Soviet Union combined are responsible for generating half. Worldwide, â€Å"carbon dioxide emissions are increasing by four percent a year.† (Miller, 1990, p. 450). Motor vehicles are a major cause of air pollution as is fuel burned for the heating of homes and powering industry along with the toxins emitted from stacks at coal-burning power plants. â€Å"Vehicles produce high levels of carbon monoxides (CO) and a major source of hydrocarbons (HC) and nitrogen oxides (NO x), whereas, fuel combustion in stationary sources is the dominant source of sulfur dioxide (SO2)† (Breuer, 1980, p. 70). If the balance between the CO2 levels in the ocean and atmosphere is disturbed by interjecting increasing

Western civilization Essay Example | Topics and Well Written Essays - 500 words - 9

Western civilization - Essay Example al sources such as Exodus, Homer’s Odyssey and Herodotus represent a distinctively â€Å"western† perspective not just by having elements which resemble western total way of life, but by actually having generated and shaped western political, social and economic way of life. According to Fanfan (2007), one of the indicators of Homer’s Odyssey being a reflection of western perspective is seen in Agamemnon’s act of assembling his Greek army to invade other kingdoms such as Thessaly, the Messenians, the Arcadians, the Opeians and the Greeks. To Agamemnon the king of Mycenae, his kingdom was to spread through military conquests and treaties. This is in line with the western perspective of international politics and seeking state interests which is deeply hegemonic in nature. The hegemonic nature of the western world is exemplified by the occupation of America by the settlers, once Christopher Columbus discovered it in 1492, the Scramble and Partition for Africa, colonialism, World War I and II. All these were attempts to perpetuate the strength and interests of a state or a nation-state. The same has not changed even presently, since western countries still use neocolonialism to economically and socio-politically subjugate developing

Critically analyze the importance of the factors that managers must Essay

Critically analyze the importance of the factors that managers must consider in - Essay Example In today’s business contexts, organizations and their environments are becoming more complex and changes occur rapidly and therefore managers are to consider all marketing related factors and its critical significance to the forecasting as well. A good forecasting must be consistent with other parts of the business (Keat and Young, 2009, p 143). For example, when a manger forecast 25 % increase in sales, it must ensure that there are sufficient facilities, labor forces and raw materials to meet this target. The demand forecast must be based on ‘past knowledge’ because forecasting is a process of foreseeing the future from the past performances. Even though in certain cases past results are not so important as in the case of new product development, past knowledge contribute much to the successful demand forecasting ((Keat and Young, 2009, p 143). A manager conducting forecast must be able to consider the economic and political environment and the probable changes because the these factors can cause major changes in the way the business is to be carried out. An effective forecast must be timely as well because if the results are too late, the managerial action also will be late that will lead to business failure (Keat and Young, 2009, p

American Policing Essay Example | Topics and Well Written Essays - 500 words

American Policing - Essay Example was characterized by crime control, efficient organization, professional remoteness from the community, hiring of competent and qualified personnel in curbing police inefficiency, and it stressed on preventive rapid and motorized response to crime. Police officers standardized and routinized police work, officers were mandated to enforce law and make arrests whenever they could. Further, when specific problems arose, special police units such as tactical or juvenile were established to deal with the issues rather than giving problems to patrol officers (Cole & Smith, 2004). These characteristics squared with those principles suggested by Robert Peel in that, they emphasized on the importance of preventing crime and disorder in society. In addition, during the professional era of policing, the stressed on the need of public approval to be efficient and effective which are in agreement with Robert’s tenets of policing. In addition, if the police used force in enforcing law and order, the degree of cooperation with the public declines. In addition, the police must obtain the willing cooperation of the people to respect and obey the law in order to get respect of the public. Further, the police are allowed to apply force only after using all other means to get compliance from law breakers. Lastly, the police just like other members of the public too belong to the public who are discharging their service to secure the welfare of the society or public (Cole & Smith, 2004). Community oriented policing was created as a result of increase in crime. The community oriented policing brings government officials, community, professionals and neighborhood together to trace and solve problems within community and partner together to solve these problems. The concept of community policing was created to reunite the community by reducing crime and fear in society. The interaction between the police and the community can help reduce fear and crime in society. Community policing

The Only Imperial Power in Asia Essay Example for Free

The Only Imperial Power in Asia Essay In the nineteenth century, China, Korea, and Japan, as well as other Asian nations faced European imperialism. However, only Japan transformed its traditional society and became the only country in Asia that had colony outside. In my point of view, the Japanese success is depending on determination of the government and the strength of it reform. So what makes Japan have the determination to reform the whole traditional society entirely? Opium War: In 1840, Britain started the Opium War in China. Because of corruption of the Chinese government and Advanced British army, in the end of the war, China was defeated. Japan shocked. China, a wealth and strong empire, an advanced country Japan learned from for thousand years, failed in a war with a real empire. Japanese contemplated and hesitated. What they should do when they have to face those strong enemies. I think that one of the reason why the Black Ships arrived in Japan in 1853 and forced Japanese to accept them, and Japan did so, even with welcoming attitudes. Besides, at that time, Japan didn’t have ability to defeat those aggressors. More and more western countries came to Japan with new technologies, new products and new work system, etc. Japan is closed for too long time. After saw all those achievements from Industry Revolution by Japanese’s own eyes, they found the distance between themselves and advanced western countries. All those new things cause the fail of Tokugawa Bakufu. Meiji Restoration started. Government during Meiji Restoration: In April 6 1868, the Oath in Five Articles was published and became the basic guiding principle of the government. Meiji period began. The new government of Japan applied a lot of policy during that time. They changed the traditional society structure. Samurai was no more the lords. Businessman had more attention than before. Government also support a lot industry to get start, the earlier one is filature. In 1882, Japan Central Bank was set. Under the slogan of â€Å"Enrich the Country, strengthen the military†, in 1871, the new government set Iwakura Diplomatic Delegation to visit 12 countries in the Europe and America for almost 2 years. There were 49 government officials in the team, almost half number of the all officials in Japan government. To pay the expense of this trip, the new government used 2% of its GDP of that year. I think that this is part of the reason why Japan reformed its whole society system entirely and learned it from western countries. On the other side, 58 years after Opium War, China also had a restoration, called The Reform Movement. It was supported by the Emperor Kuang Hus, but it didn’t get support from the government officials, even not from his mother, Empress Tzu Hsi who had real power of China. Most changes and policy applied in China were surface work, didn’t change from the basic principle like what Japan did. The most obvious difference of it was that in 1890, The Constitution of the Empire of Japan was published. All those caused the failure of reformation in China. People in the Meiji Restoration: Shibusawa Eiichi, was a Japanese industrialist, founded more than 500 hundreds of modern corporations in Japan, He was a member of Tokugawa Akitake’s Delegation to the Paris World Exposition. In this trip, he observed modern European societies and culture for the first time. When he visited Belgium, the king told him the importance of steel industry and hoped Japan can buy from Belgium. Shibusawa Eiichi was so surprised; he said that a king is to sell his country’s product even when meeting guests from other place. He realized the importance of industrial of a country. Therefore, he decided to stay in European for studying. He came back to Japan in 1868 with his new thought, and got a job in economic department of Meiji government. He became a driving force in the building of a modern Japan as head of the Kaisei Kakari, or office of the Ministry of Finance in charge of reform. Okubo Toshimichi is regarded as one of the main founders of modern Japan. During Meiji Restoration, he was a Finance Minister, enacted a Land Tax Reform, and prohibited samurai from wearing swords in public, even though he was one of them. We can see his determination of changing Japan from very basic. The greatest achievement of him was the establishment of modern governmental structures. For a time he was the most powerful man in Japan. On 14 May 1878, he was assassinated by samurai. Summary: In my opinion, Japan became the only imperial power in Asia during nineteenth century, because the way it reformed. Japan’s restoration was not only applied on industry like China, but also on government system and society structure. The development on its society structure and police system helped Japan have much faster progress in industry than any other countries at that time.

Silver-graphene Oxide Composite for Optical Sensor

Silver-graphene Oxide Composite for Optical Sensor KHOSRO ZANGENEH KAMALI ORIGINAL LITERARY WORK DECLARATION FORM ABSTRACT In this work, a [emailprotected] oxide ([emailprotected]) nanocomposite-based optical sensor was developed for the detection of biomolecules such as dopamine (DA), ascorbic acid (AA), and uric acid (UA). An aqueous solution of [emailprotected] was prepared using a simple chemical reduction method, and it showed a characteristic surface plasmon resonance (SPR) band at 402 nm. The SPR features of the [emailprotected] nanocomposite were used for the detection of DA, AA, and UA. The SPR intensity-based limits of detection (LoDs) of DA, AA, and UA were 49 nM, 634 nM, and 927 nM, respectively. The SPR band position-based LoDs of DA, AA, and UA were 30 nM, 1.64 à ¯Ã‚ Ã‚ ­M, and 2.15 à ¯Ã‚ Ã‚ ­M, respectively. The present optical sensor was more sensitive to DA than to UA and AA. The interactions of the biomolecules with [emailprotected] were studied based on the density functional theory (DFT), and it was found that DA had more interaction than AA and UA. This novel [emailprotected] nan ocomposite is simple to prepare and showed excellent stability and sensitivity toward the detection of biomolecules. The similar material is used for colorimetric detection of Mercury(II) ions (Hg(II)) that is able to show existence of 100  µM Hg(II) ions in solution by naked eyes. The development of this optical sensor for Hg(II) using silver nanoparticles (Ag NPs) is based on the decrement in the localized surface plasmon resonance (LSPR) absorption of the Ag NPs and the formation of silver-mercury (AgHg) amalgam. It is observed that increasing Hg(II) ions concentration in the solution results in the decrease of LSPR intensity and decolouration of the solution. The existence of GO prevents the agglomeration of Ag NPs and enhances the stability of the nanocomposite material, enabling this material to be used in industrial and real sample applications. ABSTRAK Di sini, oksida perak @ graphene (Ag @ GO) berdasarkan nanokomposit-sensor optik telah dibangunkan untuk mengesan biomolekul seperti dopamine (DA), asid askorbik (AA), dan asid urik (UA). Larutan akueus Ag @ GO telah disediakan dengan menggunakan kaedah pengurangan kimia yang mudah, dan ia menunjukkan satu ciri plasmon permukaan resonans (SPR) band di 402 nm. Ciri-ciri SPR daripada Ag @ GO nanokomposit telah digunakan untuk mengesan DA, AA, dan UA. Had keamatan-pengesanan (LoDs) bagi SPR berdasarkan daripada DA, AA, dan UA adalah masing-masing 49 nM, 634 nM, dan 927 nM,. The band SPR berdasarkan kedudukan-LoDS daripada DA, AA, dan UA adalah masing- masing 30 nM, 1.64 uM, dan 2.15 uM. Sensor optik masa kini adalah lebih sensitif kepada DA daripada UA dan AA. Interaksi daripada biomolekul dengan Ag @ GO dikaji berdasarkan ketumpatan teori fungsional (DFT), dan didapati bahawa DA mempunyai interaksi lebih daripada AA dan UA. Novel ini Ag @ GO nanokomposit adalah mudah untuk menyediakan dan menunjukkan kestabilan yang sangat baik dan kepekaan terhadap pengesanan biomolekul.Bahan yang sama telah digunakan untuk pengesanan colorimetric ion Mercury(II), (Hg(II)) yang mampu dilihat dengan kewujudan 100 ÃŽÂ ¼M ion Hg(II) dalam larutan dengan mata kasar. Pembangunan sensor optik bagi Hg(II) menggunakan nanozarah perak (Ag NPS) adalah berdasarkan pengurangan pada penyerapan Ag NPs resonan plasmon permukaan setempat (LSPR) dan pembentukan amalgam perak-merkuri (AgHg). Dapat diperhatikan bahawa peningkatan kepekatan ion Hg(II) memberikan hasil pengurangan pada intensiti LSPR dan perubahan warna. Peningkatan jumlah ion Hg(II) pada satu tahap membawa perubahan dalam morfologi Ag NPs dan pembentukan amalgam AgHg yang mempengaruhi LSPR Ag NPS dan menjadikan perubahan warna pada [emailprotected] Kehadiran GO menghalang penggumpalan Ag NPS dan meningkatkan kestabilan bahan nanokomposit yang membolehkan bahan ini untuk digunakan dalam industri dan aplikasi sampel sebenar. ACKNOWLEDGEMENTS / DEDICATION TABLE OF CONTENTS Table of Contents SILVER-GRAPHENE OXIDE COMPOSITE FOR OPTICAL SENSOR APPLICATIONS ORIGINAL LITERARY WORK DECLARATION FORM ABSTRACT ABSTRAK ACKNOWLEDGEMENTS / DEDICATION TABLE OF CONTENTS LIST OF FIGURES LIST OF TABLES LIST OF SYMBOLS AND ABBREVIATIONS LIST OF APPENDICES CHAPTER 1: INTRODUCTION CHAPTER 2: LITRETURE REVIEW 2.1. Plasmonic band of metal Nanoparticles 2.2. Graphene Oxide 2.3. Sensor 2.3.1. Electrochemical sensor 2.3.2. Surface enhanced Raman scattering 2.3.3. Optical sensor 2.4.2 Amalgamation and LSPR CHAPTER 3: MATERIALS AND METHODS 3.1. Chemicals and Reagents 3.2. Preparation of [emailprotected] Nanocomposite 3.3. Characterization Techniques 3.4. Optical Detection of Biomolecules 3.5. Optical Detection of Hg(II) ions CHAPTER 4: RESULTS AND DESCUSSIONS 4.2. Optical Sensing of Biomolecules using [emailprotected] Nanocomposite 4.2.1. Morphological Studies of [emailprotected] after Addition of Biomolecules 4.2.2. Raman Studies of [emailprotected] Nanocomposite 4.2.3. Computational Studies 4.3. Optical sensing of Hg(II) ions 4.3.1. Optical properties of [emailprotected] nanocomposites 4.3.2. Optical sensing of Hg(II) ions by [emailprotected] nanocomposite 4.3.3. Mechanism for the Amalgamation based detection of Hg(II) ions with [emailprotected] nanocomposite 4.3.4. Characterization of [emailprotected] nanocomposite before and after addition of Hg(II) ions 4.3.5. Selectivity of [emailprotected] nanocomposite based optical sensor 4.3.6. Practical application CHAPTER 5: CONCLUSION AND DISCISSION REFERENCES Supplementary Appendix LIST OF FIGURES Figure 1: UV-vis absorption spectra of (a) AgNO3 (b) GO, and (c) [emailprotected] nanocomposite. Inset: Photograph obtained for the aqueous solution of synthesized [emailprotected] nanocomposite. Figure 2: (A) Absorption spectra obtained for [emailprotected] nanocomposite upon each addition of 100 nM DA. (B) Plot of absorption intensity vs. DA concentration. (C) Plot of Id vs. DA concentration. (D) Plot of ÃŽ »max vs. DA concentration. Figure 3: (A) Absorption spectra obtained for [emailprotected] nanocomposite upon each addition of 5  µM AA. (B) Plot of absorption intensity vs. AA concentration. (C) Plot of Id vs. AA concentration. (D) Plot of ÃŽ »max vs. AA concentration. Figure 4: (A) Absorption spectra obtained for [emailprotected] nanocomposite upon each addition of 5  µM UA. (B) Plot of absorption intensity vs. UA concentration. (C) Plot of Id vs. UA concentration. (D) Plot of ÃŽ »max vs. UA concentration. Figure 5: TEM images of (A) as-prepared [emailprotected] nanocomposite and after additions of (B) AA, (C) UA, and (D) DA. Figure 6: Raman spectra of (a) [emailprotected] and (b) [emailprotected] with 1-à ¯Ã‚ Ã‚ ­M additions of (b) DA, (c) UA, and (d) AA. Figure 7: Electron density map and energy gap of HOMO and LUMO energy levels for Ag and DA, UA, and AA adducts, respectively calculated by DFT methods. Figure 8: Absorption spectra for the (a) AgNO3, (b) GO and [emailprotected] nanocomposite. Figure 9: Absorption spectral changes observed for the [emailprotected] nanocomposite (A) before and (B) after the addition of 200  µM Hg(II) ions. Inset: The digital photographic images taken for the corresponding solution. Figure 10: (A) Absorption spectral changes observed for [emailprotected] nanocomposite upon each addition of 100 nm ÃŽ ¼M of Hg(II) ions to the solution. (B) Plot of changes in the absorption intensity maximum at ÃŽ »LSPR of [emailprotected] nanocomposite against various Hg(II) ions concentr Figure 11: (A) Schematic explain the function of GO in the detection Hg(II) ions. (a) Addition of Hg(II) ions into a solution containing [emailprotected] nanocomposite. (b) Adsorption of Hg(II) ions on the surface of GO. (c) Interaction of Hg(II) ions with Ag NPs and formation of AgHg amalgam. (B) Schematic representation for the formation of AgHg amalgam and its influence in absorption spectra of the Ag NPs present in the [emailprotected] nanoparticles. Figure 12: Overview and high magnification TEM images obtained for the [emailprotected] nanocomposite before (A andB) and after addition of 200  µM Hg(II) ions (C and D). Figure 13: X-ray diffraction patterns obtained for the [emailprotected] nanocomposite (a) before and (b) after addition of 200  µM Hg(II) ions. Figure 14: XPS spectra obtained for the AgHg amalgam particles and their corresponding (A) Ag 3d and (B) Hg 4f regions of core-level spectra. Figure 15: Cyclic voltammograms recorded in 0.1 M phosphate buffer solution with pH 7.0 at a scan rate of 50 mV s−1 for the GC electrode coated with the solution containing [emailprotected] nanocomposite (A) before and (B) after addition of 200  µM Hg(II) ions. Figure 16: Difference in percentage of Ag NPs absorbance peak reduction observed for [emailprotected] nanocomposite in the presence of 200  µM Hg(II), Na(I), K(I), Mn(II), Ni(II), Zn(II), Co(II), Cu(II), Fe(II) and Fe(III) into the individual solutions. Inset: Photograph taken after the addition of 200  µM of Hg(II) ), Na(I), K(I), Mn(II), Ni(II), Zn(II), Co(II), Cu(II), Fe(II) and Fe(III) into the individual solution. LIST OF TABLES Table 1: Analytical performances of [emailprotected] nanocomposite for the detection of DA, UA and AA in human urine sample. Table 2: Comparison of the sensing performance of some of the Ag NPs towards Hg(II) ions. Table 3: Determination of Hg(II) ions in different water samples by using [emailprotected] nanocomposite. LIST OF SYMBOLS AND ABBREVIATIONS DAdopamine UAuric acid AAascorbic acid LoD limit of Detection LSPRlocalized surface plasmon resonance SPRsurface plasmon resonance SERSsurface enhanced resonance plasmon scattering mmili  µmicro nnano Mmolar HPLChigh-performance liquid chromatography NPsnanoparticles Hg(II) ionmercury (II) ion GOgraphene oxide rGOreduced graphene oxide GCEglassy carbon electrode eVelectron volt DFTdensity functional theory HRTEMhigh resolution transmission electron microscope XRDX-ray diffraction XPSX-ray photoelectron spectroscopy FESEMfield emission scanning electron microscope a.u.arbitrary unit LIST OF APPENDICES CHAPTER 1: INTRODUCTION For several decades, silver (Ag) nanoparticles have been attracting attention because of their excellent optical and electronic properties, high catalytic activity, and biocompatibility. Hence, they are used in a wide range of applications such as catalysis 1, solar cells 2,3, and optical 4 and electrochemical sensors 5. Ag nanoparticles possess a sharp absorption in the visible region (400–500 nm), depending on the size of the nanoparticles. This absorption feature arises from the surface plasmon resonance (SPR), which is the absorption of light by the nanoparticles because of surface vibrations between atoms 6–8. This SPR feature allows Ag nanoparticles to be used in optical sensors for the detection of toxic metals 9, biomolecules 10, and organic compounds 11. The addition of any analyte to the Ag nanoparticles leads to assembled/aggregated nanoparticles. This influences the SPR absorption band and is extensively used to follow the molecular recognition processes. Dopamine (DA) is an important catecholamine that belongs to the family of excitatory chemical neurotransmitters. It plays an essential role in the functioning of the drug addiction, cardiovascular, renal, central nervous, and hormonal systems, and in Parkinson’s disease 12. Thus, it is very important to develop a simple sensor for the detection of a sub-micro-molar concentration of DA. In recent years, the detection of biomolecules such as uric acid (UA) and ascorbic acid (AA) in human fluids such as urine and serum has gained considerable attention 13. A deficiency or excess amount of UA in the body causes several diseases, including Lesch/Nyhan syndrome, hyperuricaemia, and gout 14. Cardiovascular disease and kidney damage result from an elevated UA concentration in serum 15. Analytical methods such as high-performance liquid chromatography (HPLC) 16, spectrofluorimetry 17, spectrophotometry 18, mass spectrometry 19, and electrochemical sensors 20 have been reported for the detection of these neurotransmitter molecules. However, the existing detection methods have several limitations such as the need for expensive equipment, well-trained operators, and tedious sampling and time-consuming procedures. Alternatively, an optical sensor platform is more attractive for sensing a wide range of analytes. It is cost effective, portable, has a rapid response, and can provide real-time analyses. Recently, Ramaraj and his coworker reported a silicate-Ag nanoparticle-based optical sensor for the detection of DA, UA, and AA with LODs of 5, 5, and 1 nM, respectively 9 (Figure 1). Most commonly, Ag nanoparticles are synthesized using various chemical and physical methods, which are not eco-friendly and suffer from problems that include the poor reproducibility and stability of the Ag nanoparticles due to colloidal aggregation 21. In order to overcome such limitations, considerable efforts have been made to prepare Ag nanoparticles on polymer 22, silicate sol-gel 11, and graphene nanosheets 23. Among these, Ag-graphene has a large surface area and strong van der Waals force between the graphene and Ag nanoparticles, which significantly reduces nanoparticle aggregation. In addition, the high interfacial interactions ensure the stability of the Ag nanoparticles 24. In this study, graphene oxide-supported Ag nanoparticles were prepared using a simple chemical reduction method and used in an optical sensor for the detection of biomolecules such as DA, AA, and UA (Figure 2). The present synthetic method for the for preparation of [emailprotected] nanocomposite has a dvantages over other methods 11, 21-24 such as, long term stability, high homogeneity, rapid and ease of preparation and avoids any surfactant, stabilizers. Silver nanoparticles (Ag NPs) attracted much attention due to its biocompatibility, high catalytic activity, anti-bacterial activity, electronic and optical properties 25–28. The Ag NPs possess a principal absorption band in the region of 400 nm due to the localized surface plasmon resonance (LSPR)29,30. This SPR feature of Ag NPs is aroused due to the collective oscillation of electrons on the surface of the Ag NPs that are excited by incident electromagnetic waves 31. The SPR band position and intensity mainly depend on the size, shape and refractive index 32. This SPR band of Ag NPs is more sensitive to the surrounding environment and it significantly influences the band position and intensity. Based on the changes in the LSPR band position and intensity, an optical sensor platform with Ag NPs was developed to detect the wide range of analytes, including biomolecules 33, nitroaromatics 34, phenolic compounds 35, and heavy metal ions 36. Among the investigated analytes, heavy metal ions especially Hg(II) ions are more often monitored with Ag NPs through the optical sensing method owing to its high toxicity and solubility in water37. Mercuric (Hg(II)) ions are mainly released into the atmosphere from solid waste incineration, power plants, and bumping fossil fuels38 that pollute water, soil and air 39,40. The existence of Hg(II) ions in water causes serious damage to the brain, nervous system, kidneys and endocrine system of living organisms41. Developing a system for detecting Hg(II) with high sensitivity and selectivity against other common metal ions dissolved in water is a challenge in recent years 42–47. From an environmental point of view the development of an inexpensive, simple, selective and sensitive method of detection of Hg(II) becomes highly important. There are many types of sensors invented to detect Hg(II) in the environment. Some studies reported the detection of Hg(II) ions using electrochemical methods 48,49. Although they achieved a very high limit of detection (LoD), they need to use expensive apparatus and complicated setup. For the electrochemical testing of Hg(II) sample, the fabrication of an electrode is necessary, and that is a very tedious process. In addition, the detection of Hg(II) using fluorescence spectrometry has been widely investigated 50,51. Although this method is simple and is able to detect trace amounts of Hg(II) ions in solution, it requires expensive equipment to work. In this respect, colorimetric sensors are cheaper and do not require tedious preparation methods, colorimetric sensors have the advantage that the existence of Hg(II) is easily discernible to the naked eye without being affected by other possible dissolved ions 52–59. Recently, Hg(II) ion sensing was reported with noble metals su ch as Au and Ag by utilizing the size/interparticle distance-dependent optical properties and high extinction coefficients 60–62. The interaction between surfactants and metal NPs results in changes to the refractive index of these NPs and the LSPR band 32,33. They also may electrostatically repel the analyte, preventing it from interacting with the metal NPs and reduces the sensitivity of the sensor. In this study, the Ag NPs was prepared by using a simple chemical reduction agent and stabilized on graphene oxide (GO) sheets. Subsequently, the [emailprotected] nanocomposite was used to develop a colorimetric sensor for the detection of Hg(II) with the naked eye and an optical sensor also developed based on the LSPR changes upon the addition of various Hg(II) concentrations. This significant change in the LSPR of the Ag NPs is due to change in the morphology through the formation of AgHg amalgam. Selectivity in the detection of Hg(II) in the presence of various environmentall y relevant metal ions was also studied. CHAPTER 2: LITRETURE REVIEW 2.1. Plasmonic band of metal Nanoparticles Most probably gold nanoparticles (NPs) synthesized in the 5th or 4th century BC in China and Egypt regions 63. From that time, gold NPs have been used in both medicine and aesthetic aspects. As the result of the interesting optical properties of gold NPs, they were used for changing color of glass 64, pottery and ceramics 65. Faraday got interested about the optical properties of gold NPs and reported about the range of colors of gold nanoparticles colloidal solutions from ruby red to amethyst in 1857. Then he studied the factors influencing the color of gold NPs solutions and concluded that ‘‘the mere variation in the size of particles gave rise to a variety of resultant colors’’. Other than their optical properties, many applications of metal nanoparticles have been found in biochemistry, catalysis and sensors. For instance, one of the anti-odour commercialized devices in Japan is using the technology of immobilizing gold nanoparticles in oxide matrixes as active oxidation catalysts 66. In defenitions, nanoparticles are particles composed of number of atoms, ranging from 3 to 107 67. Nanoparticles feature properties are different from atoms or bulk material due to their size. The metallic nanoparticles larger than 2 nm possess a strong and broad absorption band in the UV-visible spectrum that is called surface plasmon resonance (SPR) band. This absorbance has discovered by Gustav Mie and known as Mie resonance 67. For smaller nanoparticles, quantum effects become more prominent and LSPR disappears. All metal nanoparticles possess the mensioned optical property, but the series of Au, Ag and Cu have very intense LSPRs. Other than that, their easy synthesis methods and their robustness to environmental conditions made silver and gold NPs to widely be used in this field. The LSPR features such as position, shape and intensity are strongly depends on various factors, to mention: the changes in the interparticle distance of the NPs and , a nd the changes in the refractive index of the local surrounding environment 68. There are indeed other types of plasmonic signals, such as the surface plasmon resonance band produced by planar metallic films, in reflection or transmission, some of them being called plasmon polaritons. Though the resulting physics is extremely exciting and the recent discoveries numerous, it is out of the scope of present thesis and they will not discuss further. In recent years, many theories were adopted by both physicists and chemists in order to give a clear description of the SPR band and on the main factors impacting its position, broadness and intensity. Many works has done to overview the existing plasmon band theories 67, and explain the SPR band by Mie and effective medium theory 69. There are some researches to explain optical propertiese of NPs with arbitrary shape by Maxwell equation theory 6. The phenomenon on absorbance of certain wavelength of light observed in transmission of light through metal nanoparticles in solid or solution phase, is called localized surface plasmon resonance band (LSPR).Nanoparticles intract with incident light in certain frequency that result global scattering of it. This observation can be explained by the collective resonance of the conduction electrons of the nanoparticle, due to interaction of electrons in nanoparticles with light. The evaluation of all parameters of material, specially its dielectric constant is necessary for understanding and study this phenomena. Usually, dielectric constant of nanoparticles count same as its bulk form and confinement effects and defects induced by edges or impurities will be neglected. For this aim a study on electrostatics in bulk metal by using Maxwell equations is necessary. In formulating the dielectric constant with known parameters, the Drude model, which describes the motion of free electrons in a metal can be applied. Then the question of the nanoparticles will be addressed: the conditions for conducting electrons resonance will be determined by several means. The determination of the frequency of the absorption maximum (denoted , the frequency of the Mie resonance), the height of this maximum and the width of the peak will be the ultimate goal of the calculations. The different geometrical confinement effect of free electrons on each material caused the electronic motion for nanoparticles vary material by material. Indeed, here the nanoparticles can be seen as a cationic network in which a cloud of conducting electrons (or free electrons) moves and oscillates. Nanoparticles dimensions are very small compared to the wavelength of the UV-visible light for which the phenomenon is observed and also comparable to the mean free path of electrons. The surface plasmon band is known to the resonance of the electronic cloud with the incident wave and the mechanics of this phenomeno n can be evaluated. In the case of nanoparticles, the conditions that electron cloud can resonate needs to be calculated. For this aim, The dielectric constant of metal nanoparticles assumed to be the same as the bulk material. Some postulates then become incorrect, but in calculation we have to keep them as an approximation. For instance, the electron density in small particles (r = 0) is not uniform and the charge will accumulate in particle edges and surface. Other than that, since the size of nanoparticles is very small comparing to the wavelength of incident light, we can consider that all electrons in the nanoparticle face with the same field at the given time and the electric field is independent of position 67. This hypothesis is known as the quasi-static approximation. When the electric field incidents to the particle, it result the displacement of the electron cloud that leads to the creation of surface charges. The positive charge would be where the cloud is lacking and the negative charge would be where it is concentrated (Fig. 1). 67 The therm â€Å"surface† is justified by the electron cloud charge mentioned in previous statements. However, we have to kep in mind that all the electrons are moving together (collectively) under the influence of electromagnetic field. This collective oscillation leads to plasmon polaritons, 64 that is different with the free plasmon in the bulk metal.67 The term â€Å"plasmon† was given to the SPR phenomenon by Shopper, due to the bounded gaseous plasmon oscillations.67 The dipolar charge repartition imposes a new force on the electron cloud. The electrons undergo a restoring force which conflicts with the external electric field. Figure.‎0.1. Schematic description of electronic cloud displacements in nanoparticles under the effect of a electromagnetic wave. 2.2. Graphene Oxide Recently, chemically modified graphene (CMG) has been studied in the context of many applications, energy-related materials, such as polymer composites, ‘paper’-like materials, field-effect transistors (FET), sensors, and biomedical applications, due to its excellent electrical, mechanical, and thermal properties. 70–72 Chemical modification of graphene oxide, which is generated from graphite oxide, has been a promising route to achieve mass production of CMG platelets. Graphene oxide contains a range of reactive oxygen functional groups, which renders it a good candidate for use in the aforementioned applications (among others) through chemical functionalizations. Although graphene known a relative novel material of broad interest and potential,1,3 GO has a history that extends back many decades to some of the earliest studies involving the chemistry of graphite.4–6 The first, the British chemist B. C. Brodie was exploring the structure of graphite by investigating the reactivity of f

The Theory of Utilitarianism Essay -- essays research papers fc

THEORY--  Ã‚  Ã‚  Ã‚  Ã‚   The theory of Utilitarianism states that actions should be judged as right or wrong depending on whether they cause more happiness or unhappiness. It weighs the rightness and wrongness of an action based on consequences of that action. PRINCIPLES-- (1) CONSEQUENCE PRINCIPLE: Actions are to be judged right or wrong mainly by their own consequences. Nothing else matters. Right actions are those that have the best consequences. -No act is right in and of it self. -No act is wrong in and of it self. (2) PRINCIPLE OF UTILITY: The only thing that matters is the amount of happiness and unhappiness that is caused. Therefore the right actions are those that produce the highest ratio of happiness over unhappiness. So in judging the consequences only the wants of happiness and pain are relevant morally. (3) PRINCIPLE OF IMPARIALITY: When finding happiness and unhappiness that's caused ones own happiness is to be looked at more important then anyone else's. Every person is equally important as the next when it comes to happiness. Applying the 3 principles of Utilitarianism: (1) Utilitarian can disagree about what is right and wrong yet still be utilitarians. (2) The principle of Impartiality has its limits, so . . . (3) Personality types can be assessed in terms of their utility. EVERYDAY SCENARIO--   Ã‚  Ã‚  Ã‚  Ã‚  Utilitarian experience's conflict when considering acts of injustice that does harm to others. That this sort of...

My Writing :: Writing Composition Education Essays

My Writing When I look at myself as a writer, I never knew I could write like this. From grade school to high school I never really looked at myself as a really good writer. I doubted myself whenever a teacher said, â€Å"We are beginning another big paper.† I feared writing and never really gave my writing any thought. However, as I got into college, I knew I would be assigned numerous amounts of papers. As I walked in to the English classroom the very first day of college I was scared. I thought I wouldn’t get anywhere because I thought I couldn’t write anything. Giving much thought into the whole writing process and having many people behind me is when I knew I could write something. As my writing developed many signs of weaknesses and strengths showed through. I have many weaknesses as a writer. One weakness in particular would be that I have writer's block. I will be able to begin a paper but never really know where to go with it. When I am writing I tend to get blocked with words to say. I don’t want to not sound academic so I have to sit for a while at my computer and think of words to say. Another weakness I feel I have is that I waste time. I tend to just sit at my computer screen and feel lost. That is a waste of time for me. I need to find a way where I can just sit at my computer and write an entire paper at one time and then revise it. One other weakness I tend to have is that I never get my resources on time. I have a tendency to just get resources off line and never make a trip to the library. But now that I am in college I know I have to make many trips to the library. Aside from the weaknesses that I tend to have, there are a few strengths I am apt to be good at.

Mirror Essay -- essays research papers

In the first stanza, the "I am not cruel, only truthful" phrase reveals the mirror's personality and charter. Unlike humans a mirror cannot judge her with opinions. Sylvia Plath uses onomatopoeia to give the mirror human characteristics. On line five she writes "The eye of a little god, four-cornered" which shows that the mirror is given God-like powers over the women. It becomes almost an obsessive relationship between the mirror and the women because she looks to the mirror for comfort only to confronted with the truth about your youth wasting away. The mirror triggers conscious and unconscious memories of her life faithfully. On line thirteen it reads "I see her back, and reflect it faithfully" once again showing that truthful charter of the mirror. Regardless of the fact she hates her reflection the women becomes dependent on the mirror, and on line fifteen you can see that relationship were it says "I am important to her. She comes and goes." The phase "I am silver and exact. I have no preconceptions." Shows that a mirror is not capable of showing anything else, then what is put in front of it. The mirror shows no color and has no preference. Although the mirror revels reality the women still clings to objects that blind her from the truth. In the second stanza, the phase "Then she turn to those liars, the candles or the moon" shows that the woman is attempting to hide her flaws behind the darkness. It is very ...

Caffeine and Reaction Time Essay

1) Identify the Problem or Question How does the consumption of caffeine affect the reaction time of the nervous system? 2) Introduction Purpose of the experiment: To identify the whether or not caffeine increases or decreases the reaction time of the nervous system. In our experiment, we have decided to use all the â€Å"cases† which will test how fast a signal from our brain will be sent to our muscles in order to click the mouse when we see an object or directions on the screen. We know that the commonly used drug, caffeine, increases the heart rate, thus the increase in blood flow. The question in our experiment is, does the increase of blood flow, caused by caffeine, positively or negatively affects the reaction time that it takes to click the mouse the moment we see an approaching object. Another underlying factor we can analyze in our experiment is gender and age. Since we are using test subjects whose ages and gender vary from 16 to 50 and from male to female, we can roughly conclude whether or not age and gender affect reaction time. The reason we say roughly, is that the two factors, age and gender, are being â€Å"tested† in conjunction with the consumption of caffeine. We do not know if the consumption of caffeine and its effects vary for how old the person is and his or her gender. 3) Research and Current Ideas In past experiments, people have concluded that there is an inconsistency in results depending on the amount of caffeine consumed. Apparently, a half-cup of coffee had faster reaction times than the reaction times that were drawn when the test subject drank a full cup of coffee. The person had concluded that too much caffeine could actually impair reaction time, but the right dosage could potentially increase reaction time. 4) Predict a solution to the problem or an answer to the question Scientific Hypothesis: The consumption of 12oz of ground coffee will speed up our reaction time. Using past experiments conducted by other people, and the chemical compounds of caffeine and its affects on our body, we have drawn this hypothesis. Dependent Variable: Reaction time Independent Variable: Condition of the test subject (Caffeine) The reaction time is the dependent variable, because the results depend on the condition of our subject. The condition of the test subject is the independent variable because we are changing the state of our test subject by increasing their caffeine levels. 5) Design the experiment to be used to test your hypothesis Materials: * 4 tablespoons/24 of Maxwell house coffee blend * Computer/Internet * 4 test subject (2 16 year olds/ 2 middle aged adults, one of each gender) * Serendip software Procedure 1) Complete a control experiment by conducting the serendip experiment while you are in your natural state for each test subject. 2) The site for the serendip activity is: serendip.brynmawr.edu/bb/reaction/reaction.html 3) Make sure that each â€Å"Case† is done 10 times to ensure accuracy. 4) Click â€Å"Results Summary† and record the information given. 5) Have each test subject consume 12 oz (2 tablespoons) of the Maxwell House Coffee blend. 6) Wait five minutes before the test subject goes through the serendip reaction time activity again. 7) Repeat steps 1-3 for each test subject, except after he or she has consumed the coffee and waiting for a duration of 5 minutes before completing the serendip activity. 8) Record the results in a data table. 6) Carry out the experiment Test Type| Control Experiment| Experiment w/ Caffeine| Act | 219 +- 15 milliseconds| 194+- 11 milliseconds| Think, Act| 270 +- 32 milliseconds| 243 +- 28 milliseconds| Read, Think, Act| 394+- 74 milliseconds| 364 +- 68 milliseconds| Read, Think-Negate, Act| 383+- 102 milliseconds| 352 +- 64 milliseconds | Jazmine Ortiz, 16, Female Jazmine Ortiz, 16, Female Daniel Kim, 16, Male Daniel Kim, 16, Male Test Type| Control Experiment| Experiment w/ Caffeine| Act | 210 +- 10 milliseconds| 191+- 8 milliseconds| Think, Act| 267 +- 31 milliseconds| 236 +- 25 milliseconds| Read, Think, Act| 381+- 74 milliseconds| 344 +- 60 milliseconds| Read, Think-Negate, Act| 375+- 102 milliseconds| 342 +- 58 milliseconds | Test Type| Control Experiment| Experiment w/ Caffeine| Act | 384 +- 72 milliseconds| 298+- 38 milliseconds| Think, Act| 340 +- 62 milliseconds| 323 +- 50 milliseconds| Read, Think, Act| 422+- 124 milliseconds| 414 +- 119 milliseconds| Read, Think-Negate, Act| 398+- 102 milliseconds| 375 +- 102 milliseconds | Test Type| Control Experiment| Experiment w/ Caffeine| Act | 372 +- 70 milliseconds| 361+- 67 milliseconds| Think, Act| 321 +- 49 milliseconds| 310 +- 46 milliseconds| Read, Think, Act| 398+- 76 milliseconds| 391 +- 74 milliseconds| Read, Think-Negate, Act| 394+- 106 milliseconds| 370 +- 68 milliseconds | *The data shown are the averages of 10 trials that was calculated by the serendip program *The data shown are the averages of 10 trials that was calculated by the serendip program Keon Shim, 39, Male Keon Shim, 39, Male Mi Ok Kim, 44, Female Mi Ok Kim, 44, Female 7) Analyze the data and observations 7) Cont. Analysis: The results we received from the experiment were what we had suspected. For every test subject, the reaction times for every â€Å"Case† that were influenced by the coffee’s caffeine were quicker than the controlled reaction times. For example, Daniel Kim had a controlled â€Å"Read, Think-Negate, Act† average reaction time of 375+-102 milliseconds. When he consumed the 12 oz of coffee, his average reaction time decreased to 344+-60 milliseconds. It is quite apparent from the graphs that the average reaction time for every â€Å"case† for each test subject decreased when absorbing caffeine into their system. Test subjects also consumed the â€Å"right† amount of caffine, 160mg, which allowed the subject to shorten their reaction time, while the wrong dosage could impair it. We can also draw from the graphs the relation that the younger the test subjects are, the quicker their reaction time will be. Also, we can also conclude from the results that males tend to have a quicker reaction time than females (Daniel’s reaction times were faster than Jazmine’s, and Keon’s were faster than Mi’s). 8) State the conclusion The hypothesis was correct. The effects of caffeine shortened the reaction time in all of our test subjects. 9) Summary Paragraph The reason why we were able to correctly devise a hypothesis for the experiment was because of the prior knowledge we had of the drug, caffeine. Caffeine increases the heart rate, which allows for faster muscle contractions. Caffeine does not really affect the actual reaction of the nervous system, but rather the actual contractions of the muscles themselves. This known fact of caffeine is reflected in the experiment. It shortened the reaction time of our test subjects in every â€Å"case†. We found other factors in our experiment that may have affected the reaction time of our test subjects. A few scientists have theorized that gender can affect reaction time. They say that males tend to have a faster reaction time because males are usually involved in more physical activities, such as sports, which helps improve reaction time. That â€Å"theory† is also reflected in our results. All the male subjects had faster reaction times than their age equivalent female subjects. Finally, the last factor would be the age of the test subject. Our younger test subjects both had faster reaction times than both the older test subjects. There are many theories being circulated that once someone enters their mid-twenties, their reaction time slowly increases.

Architectural Textbook on How to Draw Perspective and to Tiles

1 BatHroom projects Bathroom-Tile Design By Lynn Hopkins W alk into a tile showroom, and you may be overwhelmed by the sheer number of colors, materials, finishes, and sizes available. The best way to keep your wits about you is to develop a strategy beforehand for the style of bathroom you plan to create. This plan will help to guide tile selection and installation. Before going to the store, think about the character of your new bath. Are you interested in a traditional bathroom with historical references, something with fixtures and finishes that remind you of an earlier time? Or are you dreaming of something more sleek and modern?Regardless of the style of bathroom you choose, designing a tile installation requires forethought. The accompanying drawings illustrate key areas to consider when developing a tile design and show how the traditional or modern character of the room might influence tile selection and layout. As part of the planning process, I recommend making detailed dr awings that show which tiles go where on both the floor and the walls. An accurate, scaled sketch of a section of wall and floor, plus any special corner conditions, makes it much easier to order, lay out, and correctly install the tile.Start by Planning the Walls There are three standard heights to consider when tiling a bathroom wall: wainscot height, shower height, and full-wall height. You may use one, two, or all three of these heights in a single bathroom, depending on the look you are trying to achieve and on your budget. Because tiled walls are more expensive than wallboard, tile often is used only where it is needed most: on the lower portion of the wall that requires water protection. This wainscot is usually between 36 in. and 42 in. tall, enough to provide a backsplash of 4 in. or so above the sink.Tile protects the walls below towel bars from wet towels, and the walls around the toilet from the spray of rambunctious kids. Tiling to wainscot height may be adequate protec tion around tubs without showers as most splashes occur below this line. In a shower area, however, all enclosure walls should be tiled high enough to protect the walls from water spray, at least 72 in. and preferably to the ceiling. 78 Details for a Traditional Bathroom 3-in. by 6-in. brick tiles 1-in. by 6-in. color band Fixtures are centered on tile layout. 1 Shower enclosure is tiled to at least 72 in.At least 4 in. 36 in. to 42 in. Bullnose tiles 2 Border tiles define limits of the room. 6-in. by 6-in. tiles 1. TURNING CORNERS Profiled edge tiles 2. INSIDE CORNERS A bathroom with traditional characteristics has plumbing fixtures that take their styling cues from an earlier era, generally the 1920s or 1930s. The tile should reinforce these historical references. Small wall tiles, such as 3 in. by 6 in. , 4 in. by 4 in. , and even smaller mosaics, were typical in the old days, in part because the adhesive available could not support tiles that were much larger and heavier than 6 in. q. Traditional styles often celebrate the edges where tile meets wall or where wall meets floor with a border or fancy molding profile. Borders run around the perimeter of the floor and/or walls, defining the limits of the room. Bathroom-Tile Design 79 Choose the Right Tile Tiles finished on only the front face are called field tiles. When installed, they are butted next to each other with grout filling the spaces in between. Wherever wall tile stops short of the ceiling, field tiles should not be installed on the top row because the raw, unfinished edge of the tiles will be exposed.For these locations, use tile with at least one finished edge. Typically, the finished edge is a rounded bullnose shape that makes an elegant transition from tile to wall surface. In bathrooms with traditional styling, this transitional edge frequently is celebrated with a decorative border that intro- duces a band of color, a pattern, a texture, or a special profile (see the drawings on p. 79). Bord ers Create a Transition Although a decorative border is a great way to handle the tile-to-wall transition, you’ll need to consider how to handle the border when the tile goes from a lower to a taller height.In a traditionally styled bath, I prefer to turn the edging and keep the border moving up, over, and down again, using mitered corners at each turn. I find that a miter creates a crisp, clean look and allows the flexi- Details for a Modern Bathroom The details in a modern room imply expansiveness and continuity. Tile frequently runs continuously from floor to ceiling or from corner to corner. Borders like those found in a traditional bath are seldom used because they would feel constrictive. Luxurious materials, such as stone, are treated simply so that nothing competes with or detracts from the beauty of the aterial itself. Modern designs often use larger tiles—8 in. by 8 in. , 6 in. by 12 in. , 12 in. by 12 in. , or 16 in. by 16 in. —because they feel more expansive. Visual interest comes from the use of multiple materials, patterns, textures, and plane changes. In this example, the height change at the shower area is emphasized with a bump-out separating the plumbing wall into two different planes. Within the shower, 12-in. by 12-in. stone tiles run floor to ceiling. The side edges of the stone tile are mitered to finish the outside corner. Outside the shower, 6-in. by 12-in. ceramic tiles are used on the walls.The running-bond pattern helps to tie the different materials together. 12-in. by 12-in. stone tiles Running-bond pattern is an easy, inexpensive way to add visual interest. Bump-out, 2 in. minimum 6-in. by 12-in. ceramic tiles 3 3. ChaNGING plaNES Room feels more expansive with large floor tiles. Inside corner marks transition from large shower tiles to smaller wall tiles. Mitered outside corner 80 Bathroom Projects bility to use border designs without a special corner tile (see the inset drawing on p. 79). Other areas that d emand careful planning are corner borders at wall intersections.If your bath has only inside corners, you will need tiles that are finished only on the face and one edge. Outside corners—those that project into the room—require tiles finished on the face, the top, and one side. If you use tile with a profile, you’ll need a special outside-corner tile. Not all tile manufacturers or lines include these special pieces. The baseboard area, at the junction of wall and floor, is another opportunity for a decorative border. If you used a color band at the top of the tiled wall, a second band of color would work well at the bottom. If not, consider a base tile that is taller than the wainscot tiles.You can choose base tiles with a profile that incorporates a radius to meet the floor tiles. cutting the tiles around the perimeter to fit. These guidelines recommend centering the pattern on either a tile or a grout line, depending on which choice results in the largest tile s around the edges of the room. This is a good place to start, but you may want to adjust your design in response to other features in the room. One of the typical ways your eye determines whether a pattern is centered is by comparing the end tiles: If the tiles on each end are equal in size, you assume the pattern is centered.However, if your eye cannot easily compare the end tiles to each other, you’ll look for other cues, such as alignment. Sometimes, especially in large rooms, it is preferable to center tiles along lines of sight or movement. By following this strategy, the tile pattern is centered on the person using the bathroom. Tiles centered on the entry door are centered on the person who walks through that door; wall tiles centered on the sink and on the mirror above are centered on the person looking in that mirror. Tiles centered on the showerhead and control valves also are centered on the person using the shower.If tile has been centered on the key sink and sho wer walls, the layout frequently is mirrored on the opposite wall. Centering tile on the sink and the shower controls may be difficult if the sink and the shower are on the same continuous wall; but this design should be possible if the distance between the centerline of the shower or tub fittings and the sink is a multiple of the tile size. Mark out the tile design before any rough plumbing work is done; then adjust fixture placements as required for the most attractive finished room.Alignment and centering of fixtures, tiles, and sightlines reinforces the organizing principles of the design. People subconsciously find that reinforcement reassuring and, consequently, attractive. Lynn Hopkins (www. lhopkinsarch. com), an architect specializing in residential design, is based in Lexington, Massachusetts. Floor Tiles Take a Cue From the Walls Floor tiles need to be more durable and slipresistant than wall tiles, so be sure to select a type intended for floor installation. The safety a nd durability characteristics of floor tiles may give them a different look than that of wall tiles.To tie the two surfaces together visually, use the same color, texture, pattern, or other design feature from the walls in the flooring. In a traditional bath, for instance, you might use a border of the same color on the walls and the floor. Another strategy is a floor patterned with a mix of small and large tiles, where the color of the small tiles matches that of the wall tile. Smaller tiles result in more grout lines, which give the floor more texture and make it less slippery. The additional grout is more susceptible to dirt and mildew, however. Center Tile Layout on Entries and FixturesMany tile-layout guidelines suggest positioning the layout on the center of the room and Bathroom-Tile Design 81 1 BatHroom projects Details from Great Bathrooms Benches, shelves, and hooks. Don’t overlook the convenience of a small bench where you can sit and shave, shelves that can hold s oap and shampoo, and some open wall space for towel hooks and bars. 82 Tile put to good use. Variations in tile size highlight architectural details, while glassblock tiles let in plenty of light. Bold and beautiful. the play of light and color in this bathroom isn’t an accident. t’s what happens when an architect plans a bathroom remodel with an artist. Details from Great Bathrooms 83 accentuate the positive. Large, rectangular porcelain tiles installed vertically draw attention to the shower’s high ceiling while the mosaic-tile floor provides plenty of traction. liven up a bland room. Blue and white mosaics splash color across the sink wall in this st. paul, minnesota, remodel. Color coordination. staying in the same color family ties together the mosaic pebble floor and the wall of sleek subway tiles. Updating a tradition.Designed to capture the calm richness of traditional japanese architecture but with a modern focus, this bathroom was created with wall and shower tiles by casalgrande padana and custom-cut slate floor tiles. 84 Bathroom Projects Balancing the budget. saving on white ceramic floor and wall tile freed up money for the aquacolored glass mosaic wall tile. let loose. a child’s bathroom is a great place to have fun with tile. this bathroom features a whimsical countertop of brightly colored tile. Use tile to differentiate. on the floor, a switch from 13-in. eramic tile to 2-in. tile (by cerim ceramiche) distinguishes the shower from the dry part of the room. on the walls, a mosaic strip (by ceramica tres estilos) adds zip. Details from Great Bathrooms 85 2 KITChen projeCTs Putting Tile to Work in the Kitchen by Lane Meehan O ur black Lab, Bogey, is a walking mud factory and sheds so much that for tile are granite, marble, and limestone, with granite being the hardest. Stone in its natural state is porous, so wherever it’s used in a kitchen, it must be sealed to resist staining and discoloration.Stone tile has color all the way through, so deep scratches won’t expose a different base color. However, a highly polished surface on a stone tile seems to accentuate even the smallest scratches. Stone can be installed on floors, countertops or backsplashes; however, it does tend to be a high-maintenance product. On the other hand, ceramic tile is made from clay rolled flat and either sun-baked or fired in a kiln. There are hundreds of different clays, each with its own characteristics that can vary the tile’s performance. Color is applied to ceramic tile in the form of baked-on glazes that also seal the tile.In the past, ceramic-tile finishes had problems standing up to heavy use and abuse, but with recent technical advances, ceramic tile now performs better than it used to. With most ceramic tile, the color is he should be bald. When it came time to choose tile for our kitchen floor, we looked for tile that would help disguise evidence of Bogey and our three active boys. We chose a tile that looks like stone but in a color and finish that could hide dirt and dog hair until I had a spare moment to run the vacuum. Our choice was based primarily on ease of maintenance, just one consideration when choosing kitchen tile.As a tile-store owner with a background in design, I field questions all the time about incorporating tile into clients’ kitchens. This chapter addresses the questions I am asked most frequently. What Types of Tile Can I Choose From? The two most basic categories of tile are stone and ceramic. Stone tile is a natural product, mined or quarried directly from the earth. The three most common stones used 86 Tile outlines and defines kitchen spaces. a tile border gives the island in this kitchen, designed by Tim Quigley of Minneapolis, its own separate visual space. The backsplash behind the stove forms a functional accent.Putting Tile to Work in the Kitchen 87 just on the surface, so deep scratches expose the clay below. Porcelain is another m anmade tile product. Porcelain is much denser than ordinary ceramic, making it harder to scratch and break. But as with stone, the shinier the surface of ceramic or porcelain, the more scratches will show. So I try not to use highgloss tiles anywhere in a kitchen except on backsplashes, areas that are less susceptible to scratching. In the past, porcelain has been more expensive than ceramic, but improvements in technology have reduced the price.Beyond the amount of gloss, tile finishes can vary greatly. Tile finishes are graded by their ability to resist wear due to traffic; a light-industrial tile has a higher durability rating than most residential-grade tiles. Industrial-rated tile is a bit more expensive, but the extra cost makes sense if your kitchen resembles a freeway. In addition to a durability rating, the Tile Council of America (see â€Å"Sources† on p. 94) gives tile a coefficient of friction (COF) rating, which indicates how slippery the surface will be underfoo t.But if the tile feels too smooth or too slick to the touch, it will probably be too slippery to use on the floor. How Do Lifestyle and Lighting Affect Choices? The first thing I ask clients about is their family, their lifestyle, and the way their kitchen is going to be used. For example, for a client who has a large family or who does a lot of entertaining, the kitchen is a busy hub with a casual atmosphere. For this kitchen, I might suggest warm-colored tile with perhaps a softer stone look. After the client’s lifestyle, I look at the type of lighting in the kitchen.If it is blessed with a great deal of natural light from windows or skylights, tumbled marble tile or tile with a matte finish will absorb light and create a softer look (see the photo on p. 90). A textured surface on the tile softens the effect even further. On the other hand, tile with a glossy finish reflects light and helps brighten areas of a kitchen that are dimly lighted or that receive little or no nat ural light. Remember that glossy tile used in a kitchen with a lot of light, either natural or artificial, requires more frequent cleaning because fingerprints and water spots tend to show up more.When choosing tile, I also look at the color and finish of the cabinets and countertops. If the counters and cabinets have a matte or satin finish, then I try to keep the same feel in the floors and the backsplash. By the same token, if the kitchen has the Tile Offers Almost Endless Options Multipurpose porcelain Ceramic wall tile with blue crackle glaze Commercial ceramic wall tile Rosso-Verona tumbled marble Handmade glazed wall tile Handmade sanded floor tile Porcelain floor tile Limestone tile Stone look-alike ceramic tile Marble floor or wall tile 88 Kitchen Projects Ceramic Tile: Porcelain vs. Nonporcelain l tiles made of clay and cured by heat are ceramic tiles. However, ceramic tile is best understood by dividing it into two product classifications: porcelain and nonporcelain. Thei r availability and look are roughly the same, but their durability is not. Thanks to a balance in the market, porcelain tiles can now be had at nearly the same price as nonporcelain products. a when the tiles are glazed. Also, when some porcelain tiles are glazed, they are no longer guaranteed to be frostproof. nonporcelain tile is easier to work with Nonporcelain tiles are made primarily of clay mixed with minerals and water.The material is then fired to solidify the tiles into a bisque form. This process creates tile that isn’t as hard as porcelain, so it can be worked more easily with basic snap cutters and nippers instead of a wet saw. In most cases, a sealer and a glaze are applied to the surface of nonporcelain tile to create color and texture before the tile receives a second firing. The glaze applied to nonporcelain tile can make it extremely durable, but never as durable as porcelain. Nonporcelain tile’s main weakness is that it has a water-absorption rate of greater than 0. %. As a result, the tile doesn’t perform nearly as well as unglazed porcelain tile in outdoor freeze/thaw environments. porcelain tile is more durable Porcelain tiles are created by mixing porcelain clay and very finely ground sand, and curing them with high heat and pressure. Porcelain tile is denser and harder than nonporcelain tile and has a lower water-absorption rate of 0. 5% or less. Porcelain’s density makes it highly resistant to physical damage, while its low absorption rate makes the tile frost resistant, allowing it to be used outdoors.Unglazed porcelain tile is sought after for its full-body characteristics, which means its color remains consistent throughout the tile. Surface scratches and damage are less noticeable as a result, a benefit that diminishes The top choice when strength matters most. although nonporcelain tiles can be quite durable, none are as resilient as porcelain. Buy what looks good. even though damage to nonporcelain tile s is more noticeable than with some porcelain tile, they can be purchased in grades that are perfectly suited for high-contact areas like kitchen counters and floors. Putting Tile to Work in the Kitchen 89Tile can act as a dimmer switch. This kitchen gets lots of light from two sides. The natural colors and matte finish of the tumbled-marble countertop and backsplash help soften the light and cut down on glare in a kitchen with a lot of windows. polished, streamlined look of many contemporary kitchens, I suggest a straightforward tile pattern with a glossy finish. Tile color can make a large contribution toward a warm or cool feel in a kitchen. The earthy tones of limestone or tumbled marble are the warmest of the tile colors, while bright whites and blues tend to be quite cool. But even cool colors can be warmed with colored grout.For example, an ivory or off-white grout color can take the cool edge off bright white. The reverse can be true if you’re trying to achieve a form al or industrial feel with gray or blue tile. A steel-gray grout helps create a crisp, cool look. A quick vacuum and an occasional mopping, and you’re off and running. If cooking and entertaining are big parts of your life, then I’d suggest tile that won’t stain if hot grease and oil or an occasional glass of wine is spilled on it. A glazed ceramic tile works best in this situation, but for an Old World look, you can use a real stone, such as limestone.If you select a stone-tile floor, be sure to treat it with a good sealer according to the manufacturer’s directions. We recommend either Miracle Sealants’ Porous Plus or One Master Marble and Stone Care’s Gold Shield (see â€Å"Sources† on p. 94) for sealing stone tile. No matter what tile you choose for your kitchen floor, the grout should also be sealed. To make the grout more impervious to spills and stains, I recommend starting with a latex-modified grout or one that is mixed with a latex additive instead of water. Once the grout has cured properly, a sealer such as Miracle Sealants’ Porous Plus will fight off most food incursions.Another grout option is epoxy, which is stain resistant and does not require sealing. But because epoxy is harder to work with for the installer, we generally use it for smaller Will My Three Boys and the Family Dog Hurt My Tile Floor? A client’s lifestyle has the biggest bearing on the choice of floor tile. If you’d rather spend time with your three growing boys than take care of your kitchen floor, I suggest tile that hides a multitude of sins (and dirt) and always seems to look nice, such as a ceramic-stone look-alike (see the photo on the facing page). 90 Kitchen Projects No time for cleaning?For busy, active families with kids and pets, consider a tile floor with a lot of color variations such as this stone look-alike. It stays better looking longer between cleanings. areas, such as countertops. With some ti le, such as limestone, epoxy grout is not recommended, so be sure to check with manufacturers’ suggestions. some sort of threshold to create a clean transition into the next room. Tile thickness can also affect doors that swing into the kitchen, as well as appliances, such as dishwashers or trash compactors, that have to fit under the countertops in a kitchen. How Does a Tile Floor Relate to Adjacent Rooms?The kitchen-floor tile should help establish a visual flow into the surrounding areas, so I ask clients about the colors and materials on the floors of the rooms that are adjoining the kitchen. For example, if the kitchen floor joins up with a dark wood floor in the dining room, consider using tile with a warm, medium color to cut down on the visual contrast between rooms. If the kitchen floor meets colored carpet in an adjacent room, keep in mind that you’ll probably change the carpet at some point, so choose a neutral tile color that will go with future carpet choi ces. Tile thickness is another consideration.Whether the kitchen floor butts up against other existing tile, hardwood floors, or carpet, the tile installer will need to install Can Tile Make My Tiny Kitchen Look Bigger? Tile layout can have a big impact on a room’s appearance. While a parallel or straight pattern can intensify the narrowness of a kitchen, a diagonal tile pattern makes a room look wider (see the sidebar on p. 93). Tile size can also affect the appearance of the room. The smaller the tile, the busier the grout–joint pattern. The simple grout–joint pattern you get with larger 10-in. to 12-in. tiles can make a small room look larger. Smaller 4-in. to 6-in. iles on a floor can have the opposite effect, creating a mosaic pattern or a cobblestone look. Clipping the corners of square tiles creates hexagons or octagons with small square spaces left between. The small tiles (called Putting Tile to Work in the Kitchen 91 dots) that fill the spaces can intr oduce a dash of color to the floor in a pattern that breaks up the simple straight lines. Irregular tile patterns such as block random (using three sizes of tile) or a pinwheel pattern can help unify a kitchen that has many entrances and exits. These patterns also work well to blend together tile that is highly varied in color.A tile border on the floor can make a kitchen look cozier by bringing the eye in or by creating a frame around the kitchen table or an island (see the photo on p. 87). slab. And with granite tile, it’s easy to add a border to accent or complement the color of the stone. One drawback to stone tile on a countertop is the edges. Although you can round over the edges, granite tile is thinner than a solid slab (3? 8 in. to 1? 2 in. compared with 11? 4 in. , normal thickness for a granite slab), so it’s tougher to get the same full-slab look. Another drawback is not being able to install an undermount sink with granite tile.Although the tight grout joi nts of granite tile create a good, smooth work surface, machine-made ceramic tile with standard grout joints makes a slightly rougher work surface. Handmade tile is usually installed with wider grout joints that are charming, but its inherently bumpy surface can be difficult to work on and can cause wine glasses and bowls to tip over (see the photos at left). The edges of a tile countertop can be addressed in various ways. Continuing the tile over the edge gives the countertop a thick look. Relief tile, such as a rope pattern, can turn countertop edges into a visual focal point.Wooden edges that match or complement cabinets are also popular. As on floors, borders on countertops can add decoration. But if it’s used in too large an area or if a lot of items are stored on the counter, a border can be lost or distracting. Tile can also be combined with other types of surfaces for a dramatic look (see the photo on p. 90). For instance, the savings from tiling most of the counterto p might leave enough money for a solid slab of granite in the sink area for an undermount sink. A stone slab or a wood surface on only the island could make a bold statement while providing a smooth surface for an informal eating area.Is Tile OK for a Kitchen Countertop? Granite-slab countertops have long been popular in high-end kitchens. Tile countertops, both ceramic and stone, have some of the same attributes as slabs, such as durability and heat resistance, but at less than half the cost, depending on the tile you choose. Granite tile can be installed with tight grout joints to give the impression of a solid Handmade tile is pretty but uneven. The irregular surface of handmade ceramic tile is a challenge to work on and can be hazardous to wine glasses.Cutting boards should always be used on tile countertops. 92 Kitchen Projects Tile Patterns at Work he right pattern can make a kitchen look wider. Floor tile installed in a straight pattern makes a narrow room seem narrower (see the left photo below) while tile in a T diagonal pattern softens the tunnel effect of a long, narrow kitchen, making it seem wider (see the right photo below). Can Tile Be Used as a Cutting Board? Although few tile or stone surfaces can stand up to a sharp kitchen knife, most hold up well under other kitchen rigors such as abuse from pots and pans.Limestone scratches easily, but those scratches can be sanded out. Surfaces such as glossy tile or highly polished granite tend to show marks more readily, and their scratches are harder to remove or cover up. Stone or ceramic tile with a matte finish tends to hide scratches and surface abrasions better. Stone tile is also porous, so it has to be sealed properly to resist staining from things such as red wine and grease. And some ceramic tiles, as well as polished stone such as granite or marble, can lose their shine when exposed to some food acids.As in floors, latex-modified grout should be used on tiled countertops along with a good coa t of grout sealer. Again, epoxy grout, which costs a little more and is a little harder to install, will make the grout impenetrable. Should the Backsplash Blend or Make a Splash? A tile backsplash is the spot where you can be really creative with tile in the kitchen (see the photos on p. 94). Because a backsplash functions to protect the wall from splashes and splatters that come from cooking and preparing food, the only prerequisite is that backsplash tile be easy to keep clean.Beyond that, the choices become mainly aesthetic. I always ask clients how much stuff they plan to keep on their countertops. Toasters, microwaves, and canisters tend to block the backsplash, and in that case, the backsplash just provides a backdrop of color and tex- Putting Tile to Work in the Kitchen 93 sources Miracle Sealants Company 800-350-1901 www. miraclesealants. com ture. I usually recommend extending the tile from the countertop all the way to the bottoms of the wall cabinets so that the backspla sh acts as a visual connection between the upper and lower cabinets.Borders usually work best above long stretches of counter that are uninterrupted by windows or appliances. And when installed three-quarters of the way up the backsplash, a border won’t get lost near the countertop or under the wall cabinets. At that height, a border will usually clear the height of the toaster or a bowl of fruit for a continuous line. If the client is thinking of having decorative tiles scattered randomly throughout the backsplash, I suggest taping playing cards to the wall at random to see if the effect works in that particular kitchen.Playing cards can also be used in a line to test the visual power of a border. Isn’t Tile Expensive? Tile varies greatly in price, and budget is a concern for the vast majority of my clients. So here’s my strategy for keeping costs down. First, use reasonably priced machinemade tile for large areas in the kitchen. Then there will be money left f or those handmade borders, small murals, or strategically placed accent tiles that will give your kitchen a rich look without breaking the bank (see the right photo below).Installation prices can vary greatly depending on the type of tile, the layout, and the conditions of the existing floors and walls. A tile installer can explain what your options are and how much each option costs. Even if you opt for a less expensive installation, always seal the tile. Sealing tile is pretty easy, so you can save a little by doing it yourself. Spend some money on a good sealer. Lane Meehan is a tile maker and designer of decorative tiles. She and her husband, Tom, own and manage Cape Cod Tileworks in Harwich, Massachusetts. orous plus One Master Marble and Stone Care 760-406-1097 www. onemastermarble. com Gold shield The Tile Council of America 864-646-8453 www. tileusa. com Tile Art and Accents he backsplash of cows in a pasture (see the left photo below) in this kitchen designed by Randy Fritz of Lakeside, Calif. , combines the art of Roger Dunham of Petaluma, Calif. , with the practicality of T ceramic tile. Random decorative tiles in a backsplash of less expensive, machine-made tile (see the right photo below) give this kitchen a colorful accent. 94 Kitchen Projects Architectural Textbook on How to Draw Perspective and to Tiles 1 BatHroom projects Bathroom-Tile Design By Lynn Hopkins W alk into a tile showroom, and you may be overwhelmed by the sheer number of colors, materials, finishes, and sizes available. The best way to keep your wits about you is to develop a strategy beforehand for the style of bathroom you plan to create. This plan will help to guide tile selection and installation. Before going to the store, think about the character of your new bath. Are you interested in a traditional bathroom with historical references, something with fixtures and finishes that remind you of an earlier time? Or are you dreaming of something more sleek and modern?Regardless of the style of bathroom you choose, designing a tile installation requires forethought. The accompanying drawings illustrate key areas to consider when developing a tile design and show how the traditional or modern character of the room might influence tile selection and layout. As part of the planning process, I recommend making detailed dr awings that show which tiles go where on both the floor and the walls. An accurate, scaled sketch of a section of wall and floor, plus any special corner conditions, makes it much easier to order, lay out, and correctly install the tile.Start by Planning the Walls There are three standard heights to consider when tiling a bathroom wall: wainscot height, shower height, and full-wall height. You may use one, two, or all three of these heights in a single bathroom, depending on the look you are trying to achieve and on your budget. Because tiled walls are more expensive than wallboard, tile often is used only where it is needed most: on the lower portion of the wall that requires water protection. This wainscot is usually between 36 in. and 42 in. tall, enough to provide a backsplash of 4 in. or so above the sink.Tile protects the walls below towel bars from wet towels, and the walls around the toilet from the spray of rambunctious kids. Tiling to wainscot height may be adequate protec tion around tubs without showers as most splashes occur below this line. In a shower area, however, all enclosure walls should be tiled high enough to protect the walls from water spray, at least 72 in. and preferably to the ceiling. 78 Details for a Traditional Bathroom 3-in. by 6-in. brick tiles 1-in. by 6-in. color band Fixtures are centered on tile layout. 1 Shower enclosure is tiled to at least 72 in.At least 4 in. 36 in. to 42 in. Bullnose tiles 2 Border tiles define limits of the room. 6-in. by 6-in. tiles 1. TURNING CORNERS Profiled edge tiles 2. INSIDE CORNERS A bathroom with traditional characteristics has plumbing fixtures that take their styling cues from an earlier era, generally the 1920s or 1930s. The tile should reinforce these historical references. Small wall tiles, such as 3 in. by 6 in. , 4 in. by 4 in. , and even smaller mosaics, were typical in the old days, in part because the adhesive available could not support tiles that were much larger and heavier than 6 in. q. Traditional styles often celebrate the edges where tile meets wall or where wall meets floor with a border or fancy molding profile. Borders run around the perimeter of the floor and/or walls, defining the limits of the room. Bathroom-Tile Design 79 Choose the Right Tile Tiles finished on only the front face are called field tiles. When installed, they are butted next to each other with grout filling the spaces in between. Wherever wall tile stops short of the ceiling, field tiles should not be installed on the top row because the raw, unfinished edge of the tiles will be exposed.For these locations, use tile with at least one finished edge. Typically, the finished edge is a rounded bullnose shape that makes an elegant transition from tile to wall surface. In bathrooms with traditional styling, this transitional edge frequently is celebrated with a decorative border that intro- duces a band of color, a pattern, a texture, or a special profile (see the drawings on p. 79). Bord ers Create a Transition Although a decorative border is a great way to handle the tile-to-wall transition, you’ll need to consider how to handle the border when the tile goes from a lower to a taller height.In a traditionally styled bath, I prefer to turn the edging and keep the border moving up, over, and down again, using mitered corners at each turn. I find that a miter creates a crisp, clean look and allows the flexi- Details for a Modern Bathroom The details in a modern room imply expansiveness and continuity. Tile frequently runs continuously from floor to ceiling or from corner to corner. Borders like those found in a traditional bath are seldom used because they would feel constrictive. Luxurious materials, such as stone, are treated simply so that nothing competes with or detracts from the beauty of the aterial itself. Modern designs often use larger tiles—8 in. by 8 in. , 6 in. by 12 in. , 12 in. by 12 in. , or 16 in. by 16 in. —because they feel more expansive. Visual interest comes from the use of multiple materials, patterns, textures, and plane changes. In this example, the height change at the shower area is emphasized with a bump-out separating the plumbing wall into two different planes. Within the shower, 12-in. by 12-in. stone tiles run floor to ceiling. The side edges of the stone tile are mitered to finish the outside corner. Outside the shower, 6-in. by 12-in. ceramic tiles are used on the walls.The running-bond pattern helps to tie the different materials together. 12-in. by 12-in. stone tiles Running-bond pattern is an easy, inexpensive way to add visual interest. Bump-out, 2 in. minimum 6-in. by 12-in. ceramic tiles 3 3. ChaNGING plaNES Room feels more expansive with large floor tiles. Inside corner marks transition from large shower tiles to smaller wall tiles. Mitered outside corner 80 Bathroom Projects bility to use border designs without a special corner tile (see the inset drawing on p. 79). Other areas that d emand careful planning are corner borders at wall intersections.If your bath has only inside corners, you will need tiles that are finished only on the face and one edge. Outside corners—those that project into the room—require tiles finished on the face, the top, and one side. If you use tile with a profile, you’ll need a special outside-corner tile. Not all tile manufacturers or lines include these special pieces. The baseboard area, at the junction of wall and floor, is another opportunity for a decorative border. If you used a color band at the top of the tiled wall, a second band of color would work well at the bottom. If not, consider a base tile that is taller than the wainscot tiles.You can choose base tiles with a profile that incorporates a radius to meet the floor tiles. cutting the tiles around the perimeter to fit. These guidelines recommend centering the pattern on either a tile or a grout line, depending on which choice results in the largest tile s around the edges of the room. This is a good place to start, but you may want to adjust your design in response to other features in the room. One of the typical ways your eye determines whether a pattern is centered is by comparing the end tiles: If the tiles on each end are equal in size, you assume the pattern is centered.However, if your eye cannot easily compare the end tiles to each other, you’ll look for other cues, such as alignment. Sometimes, especially in large rooms, it is preferable to center tiles along lines of sight or movement. By following this strategy, the tile pattern is centered on the person using the bathroom. Tiles centered on the entry door are centered on the person who walks through that door; wall tiles centered on the sink and on the mirror above are centered on the person looking in that mirror. Tiles centered on the showerhead and control valves also are centered on the person using the shower.If tile has been centered on the key sink and sho wer walls, the layout frequently is mirrored on the opposite wall. Centering tile on the sink and the shower controls may be difficult if the sink and the shower are on the same continuous wall; but this design should be possible if the distance between the centerline of the shower or tub fittings and the sink is a multiple of the tile size. Mark out the tile design before any rough plumbing work is done; then adjust fixture placements as required for the most attractive finished room.Alignment and centering of fixtures, tiles, and sightlines reinforces the organizing principles of the design. People subconsciously find that reinforcement reassuring and, consequently, attractive. Lynn Hopkins (www. lhopkinsarch. com), an architect specializing in residential design, is based in Lexington, Massachusetts. Floor Tiles Take a Cue From the Walls Floor tiles need to be more durable and slipresistant than wall tiles, so be sure to select a type intended for floor installation. The safety a nd durability characteristics of floor tiles may give them a different look than that of wall tiles.To tie the two surfaces together visually, use the same color, texture, pattern, or other design feature from the walls in the flooring. In a traditional bath, for instance, you might use a border of the same color on the walls and the floor. Another strategy is a floor patterned with a mix of small and large tiles, where the color of the small tiles matches that of the wall tile. Smaller tiles result in more grout lines, which give the floor more texture and make it less slippery. The additional grout is more susceptible to dirt and mildew, however. Center Tile Layout on Entries and FixturesMany tile-layout guidelines suggest positioning the layout on the center of the room and Bathroom-Tile Design 81 1 BatHroom projects Details from Great Bathrooms Benches, shelves, and hooks. Don’t overlook the convenience of a small bench where you can sit and shave, shelves that can hold s oap and shampoo, and some open wall space for towel hooks and bars. 82 Tile put to good use. Variations in tile size highlight architectural details, while glassblock tiles let in plenty of light. Bold and beautiful. the play of light and color in this bathroom isn’t an accident. t’s what happens when an architect plans a bathroom remodel with an artist. Details from Great Bathrooms 83 accentuate the positive. Large, rectangular porcelain tiles installed vertically draw attention to the shower’s high ceiling while the mosaic-tile floor provides plenty of traction. liven up a bland room. Blue and white mosaics splash color across the sink wall in this st. paul, minnesota, remodel. Color coordination. staying in the same color family ties together the mosaic pebble floor and the wall of sleek subway tiles. Updating a tradition.Designed to capture the calm richness of traditional japanese architecture but with a modern focus, this bathroom was created with wall and shower tiles by casalgrande padana and custom-cut slate floor tiles. 84 Bathroom Projects Balancing the budget. saving on white ceramic floor and wall tile freed up money for the aquacolored glass mosaic wall tile. let loose. a child’s bathroom is a great place to have fun with tile. this bathroom features a whimsical countertop of brightly colored tile. Use tile to differentiate. on the floor, a switch from 13-in. eramic tile to 2-in. tile (by cerim ceramiche) distinguishes the shower from the dry part of the room. on the walls, a mosaic strip (by ceramica tres estilos) adds zip. Details from Great Bathrooms 85 2 KITChen projeCTs Putting Tile to Work in the Kitchen by Lane Meehan O ur black Lab, Bogey, is a walking mud factory and sheds so much that for tile are granite, marble, and limestone, with granite being the hardest. Stone in its natural state is porous, so wherever it’s used in a kitchen, it must be sealed to resist staining and discoloration.Stone tile has color all the way through, so deep scratches won’t expose a different base color. However, a highly polished surface on a stone tile seems to accentuate even the smallest scratches. Stone can be installed on floors, countertops or backsplashes; however, it does tend to be a high-maintenance product. On the other hand, ceramic tile is made from clay rolled flat and either sun-baked or fired in a kiln. There are hundreds of different clays, each with its own characteristics that can vary the tile’s performance. Color is applied to ceramic tile in the form of baked-on glazes that also seal the tile.In the past, ceramic-tile finishes had problems standing up to heavy use and abuse, but with recent technical advances, ceramic tile now performs better than it used to. With most ceramic tile, the color is he should be bald. When it came time to choose tile for our kitchen floor, we looked for tile that would help disguise evidence of Bogey and our three active boys. We chose a tile that looks like stone but in a color and finish that could hide dirt and dog hair until I had a spare moment to run the vacuum. Our choice was based primarily on ease of maintenance, just one consideration when choosing kitchen tile.As a tile-store owner with a background in design, I field questions all the time about incorporating tile into clients’ kitchens. This chapter addresses the questions I am asked most frequently. What Types of Tile Can I Choose From? The two most basic categories of tile are stone and ceramic. Stone tile is a natural product, mined or quarried directly from the earth. The three most common stones used 86 Tile outlines and defines kitchen spaces. a tile border gives the island in this kitchen, designed by Tim Quigley of Minneapolis, its own separate visual space. The backsplash behind the stove forms a functional accent.Putting Tile to Work in the Kitchen 87 just on the surface, so deep scratches expose the clay below. Porcelain is another m anmade tile product. Porcelain is much denser than ordinary ceramic, making it harder to scratch and break. But as with stone, the shinier the surface of ceramic or porcelain, the more scratches will show. So I try not to use highgloss tiles anywhere in a kitchen except on backsplashes, areas that are less susceptible to scratching. In the past, porcelain has been more expensive than ceramic, but improvements in technology have reduced the price.Beyond the amount of gloss, tile finishes can vary greatly. Tile finishes are graded by their ability to resist wear due to traffic; a light-industrial tile has a higher durability rating than most residential-grade tiles. Industrial-rated tile is a bit more expensive, but the extra cost makes sense if your kitchen resembles a freeway. In addition to a durability rating, the Tile Council of America (see â€Å"Sources† on p. 94) gives tile a coefficient of friction (COF) rating, which indicates how slippery the surface will be underfoo t.But if the tile feels too smooth or too slick to the touch, it will probably be too slippery to use on the floor. How Do Lifestyle and Lighting Affect Choices? The first thing I ask clients about is their family, their lifestyle, and the way their kitchen is going to be used. For example, for a client who has a large family or who does a lot of entertaining, the kitchen is a busy hub with a casual atmosphere. For this kitchen, I might suggest warm-colored tile with perhaps a softer stone look. After the client’s lifestyle, I look at the type of lighting in the kitchen.If it is blessed with a great deal of natural light from windows or skylights, tumbled marble tile or tile with a matte finish will absorb light and create a softer look (see the photo on p. 90). A textured surface on the tile softens the effect even further. On the other hand, tile with a glossy finish reflects light and helps brighten areas of a kitchen that are dimly lighted or that receive little or no nat ural light. Remember that glossy tile used in a kitchen with a lot of light, either natural or artificial, requires more frequent cleaning because fingerprints and water spots tend to show up more.When choosing tile, I also look at the color and finish of the cabinets and countertops. If the counters and cabinets have a matte or satin finish, then I try to keep the same feel in the floors and the backsplash. By the same token, if the kitchen has the Tile Offers Almost Endless Options Multipurpose porcelain Ceramic wall tile with blue crackle glaze Commercial ceramic wall tile Rosso-Verona tumbled marble Handmade glazed wall tile Handmade sanded floor tile Porcelain floor tile Limestone tile Stone look-alike ceramic tile Marble floor or wall tile 88 Kitchen Projects Ceramic Tile: Porcelain vs. Nonporcelain l tiles made of clay and cured by heat are ceramic tiles. However, ceramic tile is best understood by dividing it into two product classifications: porcelain and nonporcelain. Thei r availability and look are roughly the same, but their durability is not. Thanks to a balance in the market, porcelain tiles can now be had at nearly the same price as nonporcelain products. a when the tiles are glazed. Also, when some porcelain tiles are glazed, they are no longer guaranteed to be frostproof. nonporcelain tile is easier to work with Nonporcelain tiles are made primarily of clay mixed with minerals and water.The material is then fired to solidify the tiles into a bisque form. This process creates tile that isn’t as hard as porcelain, so it can be worked more easily with basic snap cutters and nippers instead of a wet saw. In most cases, a sealer and a glaze are applied to the surface of nonporcelain tile to create color and texture before the tile receives a second firing. The glaze applied to nonporcelain tile can make it extremely durable, but never as durable as porcelain. Nonporcelain tile’s main weakness is that it has a water-absorption rate of greater than 0. %. As a result, the tile doesn’t perform nearly as well as unglazed porcelain tile in outdoor freeze/thaw environments. porcelain tile is more durable Porcelain tiles are created by mixing porcelain clay and very finely ground sand, and curing them with high heat and pressure. Porcelain tile is denser and harder than nonporcelain tile and has a lower water-absorption rate of 0. 5% or less. Porcelain’s density makes it highly resistant to physical damage, while its low absorption rate makes the tile frost resistant, allowing it to be used outdoors.Unglazed porcelain tile is sought after for its full-body characteristics, which means its color remains consistent throughout the tile. Surface scratches and damage are less noticeable as a result, a benefit that diminishes The top choice when strength matters most. although nonporcelain tiles can be quite durable, none are as resilient as porcelain. Buy what looks good. even though damage to nonporcelain tile s is more noticeable than with some porcelain tile, they can be purchased in grades that are perfectly suited for high-contact areas like kitchen counters and floors. Putting Tile to Work in the Kitchen 89Tile can act as a dimmer switch. This kitchen gets lots of light from two sides. The natural colors and matte finish of the tumbled-marble countertop and backsplash help soften the light and cut down on glare in a kitchen with a lot of windows. polished, streamlined look of many contemporary kitchens, I suggest a straightforward tile pattern with a glossy finish. Tile color can make a large contribution toward a warm or cool feel in a kitchen. The earthy tones of limestone or tumbled marble are the warmest of the tile colors, while bright whites and blues tend to be quite cool. But even cool colors can be warmed with colored grout.For example, an ivory or off-white grout color can take the cool edge off bright white. The reverse can be true if you’re trying to achieve a form al or industrial feel with gray or blue tile. A steel-gray grout helps create a crisp, cool look. A quick vacuum and an occasional mopping, and you’re off and running. If cooking and entertaining are big parts of your life, then I’d suggest tile that won’t stain if hot grease and oil or an occasional glass of wine is spilled on it. A glazed ceramic tile works best in this situation, but for an Old World look, you can use a real stone, such as limestone.If you select a stone-tile floor, be sure to treat it with a good sealer according to the manufacturer’s directions. We recommend either Miracle Sealants’ Porous Plus or One Master Marble and Stone Care’s Gold Shield (see â€Å"Sources† on p. 94) for sealing stone tile. No matter what tile you choose for your kitchen floor, the grout should also be sealed. To make the grout more impervious to spills and stains, I recommend starting with a latex-modified grout or one that is mixed with a latex additive instead of water. Once the grout has cured properly, a sealer such as Miracle Sealants’ Porous Plus will fight off most food incursions.Another grout option is epoxy, which is stain resistant and does not require sealing. But because epoxy is harder to work with for the installer, we generally use it for smaller Will My Three Boys and the Family Dog Hurt My Tile Floor? A client’s lifestyle has the biggest bearing on the choice of floor tile. If you’d rather spend time with your three growing boys than take care of your kitchen floor, I suggest tile that hides a multitude of sins (and dirt) and always seems to look nice, such as a ceramic-stone look-alike (see the photo on the facing page). 90 Kitchen Projects No time for cleaning?For busy, active families with kids and pets, consider a tile floor with a lot of color variations such as this stone look-alike. It stays better looking longer between cleanings. areas, such as countertops. With some ti le, such as limestone, epoxy grout is not recommended, so be sure to check with manufacturers’ suggestions. some sort of threshold to create a clean transition into the next room. Tile thickness can also affect doors that swing into the kitchen, as well as appliances, such as dishwashers or trash compactors, that have to fit under the countertops in a kitchen. How Does a Tile Floor Relate to Adjacent Rooms?The kitchen-floor tile should help establish a visual flow into the surrounding areas, so I ask clients about the colors and materials on the floors of the rooms that are adjoining the kitchen. For example, if the kitchen floor joins up with a dark wood floor in the dining room, consider using tile with a warm, medium color to cut down on the visual contrast between rooms. If the kitchen floor meets colored carpet in an adjacent room, keep in mind that you’ll probably change the carpet at some point, so choose a neutral tile color that will go with future carpet choi ces. Tile thickness is another consideration.Whether the kitchen floor butts up against other existing tile, hardwood floors, or carpet, the tile installer will need to install Can Tile Make My Tiny Kitchen Look Bigger? Tile layout can have a big impact on a room’s appearance. While a parallel or straight pattern can intensify the narrowness of a kitchen, a diagonal tile pattern makes a room look wider (see the sidebar on p. 93). Tile size can also affect the appearance of the room. The smaller the tile, the busier the grout–joint pattern. The simple grout–joint pattern you get with larger 10-in. to 12-in. tiles can make a small room look larger. Smaller 4-in. to 6-in. iles on a floor can have the opposite effect, creating a mosaic pattern or a cobblestone look. Clipping the corners of square tiles creates hexagons or octagons with small square spaces left between. The small tiles (called Putting Tile to Work in the Kitchen 91 dots) that fill the spaces can intr oduce a dash of color to the floor in a pattern that breaks up the simple straight lines. Irregular tile patterns such as block random (using three sizes of tile) or a pinwheel pattern can help unify a kitchen that has many entrances and exits. These patterns also work well to blend together tile that is highly varied in color.A tile border on the floor can make a kitchen look cozier by bringing the eye in or by creating a frame around the kitchen table or an island (see the photo on p. 87). slab. And with granite tile, it’s easy to add a border to accent or complement the color of the stone. One drawback to stone tile on a countertop is the edges. Although you can round over the edges, granite tile is thinner than a solid slab (3? 8 in. to 1? 2 in. compared with 11? 4 in. , normal thickness for a granite slab), so it’s tougher to get the same full-slab look. Another drawback is not being able to install an undermount sink with granite tile.Although the tight grout joi nts of granite tile create a good, smooth work surface, machine-made ceramic tile with standard grout joints makes a slightly rougher work surface. Handmade tile is usually installed with wider grout joints that are charming, but its inherently bumpy surface can be difficult to work on and can cause wine glasses and bowls to tip over (see the photos at left). The edges of a tile countertop can be addressed in various ways. Continuing the tile over the edge gives the countertop a thick look. Relief tile, such as a rope pattern, can turn countertop edges into a visual focal point.Wooden edges that match or complement cabinets are also popular. As on floors, borders on countertops can add decoration. But if it’s used in too large an area or if a lot of items are stored on the counter, a border can be lost or distracting. Tile can also be combined with other types of surfaces for a dramatic look (see the photo on p. 90). For instance, the savings from tiling most of the counterto p might leave enough money for a solid slab of granite in the sink area for an undermount sink. A stone slab or a wood surface on only the island could make a bold statement while providing a smooth surface for an informal eating area.Is Tile OK for a Kitchen Countertop? Granite-slab countertops have long been popular in high-end kitchens. Tile countertops, both ceramic and stone, have some of the same attributes as slabs, such as durability and heat resistance, but at less than half the cost, depending on the tile you choose. Granite tile can be installed with tight grout joints to give the impression of a solid Handmade tile is pretty but uneven. The irregular surface of handmade ceramic tile is a challenge to work on and can be hazardous to wine glasses.Cutting boards should always be used on tile countertops. 92 Kitchen Projects Tile Patterns at Work he right pattern can make a kitchen look wider. Floor tile installed in a straight pattern makes a narrow room seem narrower (see the left photo below) while tile in a T diagonal pattern softens the tunnel effect of a long, narrow kitchen, making it seem wider (see the right photo below). Can Tile Be Used as a Cutting Board? Although few tile or stone surfaces can stand up to a sharp kitchen knife, most hold up well under other kitchen rigors such as abuse from pots and pans.Limestone scratches easily, but those scratches can be sanded out. Surfaces such as glossy tile or highly polished granite tend to show marks more readily, and their scratches are harder to remove or cover up. Stone or ceramic tile with a matte finish tends to hide scratches and surface abrasions better. Stone tile is also porous, so it has to be sealed properly to resist staining from things such as red wine and grease. And some ceramic tiles, as well as polished stone such as granite or marble, can lose their shine when exposed to some food acids.As in floors, latex-modified grout should be used on tiled countertops along with a good coa t of grout sealer. Again, epoxy grout, which costs a little more and is a little harder to install, will make the grout impenetrable. Should the Backsplash Blend or Make a Splash? A tile backsplash is the spot where you can be really creative with tile in the kitchen (see the photos on p. 94). Because a backsplash functions to protect the wall from splashes and splatters that come from cooking and preparing food, the only prerequisite is that backsplash tile be easy to keep clean.Beyond that, the choices become mainly aesthetic. I always ask clients how much stuff they plan to keep on their countertops. Toasters, microwaves, and canisters tend to block the backsplash, and in that case, the backsplash just provides a backdrop of color and tex- Putting Tile to Work in the Kitchen 93 sources Miracle Sealants Company 800-350-1901 www. miraclesealants. com ture. I usually recommend extending the tile from the countertop all the way to the bottoms of the wall cabinets so that the backspla sh acts as a visual connection between the upper and lower cabinets.Borders usually work best above long stretches of counter that are uninterrupted by windows or appliances. And when installed three-quarters of the way up the backsplash, a border won’t get lost near the countertop or under the wall cabinets. At that height, a border will usually clear the height of the toaster or a bowl of fruit for a continuous line. If the client is thinking of having decorative tiles scattered randomly throughout the backsplash, I suggest taping playing cards to the wall at random to see if the effect works in that particular kitchen.Playing cards can also be used in a line to test the visual power of a border. Isn’t Tile Expensive? Tile varies greatly in price, and budget is a concern for the vast majority of my clients. So here’s my strategy for keeping costs down. First, use reasonably priced machinemade tile for large areas in the kitchen. Then there will be money left f or those handmade borders, small murals, or strategically placed accent tiles that will give your kitchen a rich look without breaking the bank (see the right photo below).Installation prices can vary greatly depending on the type of tile, the layout, and the conditions of the existing floors and walls. A tile installer can explain what your options are and how much each option costs. Even if you opt for a less expensive installation, always seal the tile. Sealing tile is pretty easy, so you can save a little by doing it yourself. Spend some money on a good sealer. Lane Meehan is a tile maker and designer of decorative tiles. She and her husband, Tom, own and manage Cape Cod Tileworks in Harwich, Massachusetts. orous plus One Master Marble and Stone Care 760-406-1097 www. onemastermarble. com Gold shield The Tile Council of America 864-646-8453 www. tileusa. com Tile Art and Accents he backsplash of cows in a pasture (see the left photo below) in this kitchen designed by Randy Fritz of Lakeside, Calif. , combines the art of Roger Dunham of Petaluma, Calif. , with the practicality of T ceramic tile. Random decorative tiles in a backsplash of less expensive, machine-made tile (see the right photo below) give this kitchen a colorful accent. 94 Kitchen Projects