Applications of Silicon
Silicon is one of man’s most useful elements. In the form of sand and clay it is used to make concrete and brick; it is a useful refractory material for high-temperature work, and in the form of silicates it is used in making enamels, pottery, etc. Silica, as sand, is a principal ingredient of glass, one of the most inexpensive of materials with excellent mechanical, optical, thermal and electrical properties. Hyperpure silicon can be doped with boron, gallium, phosphorus, or arsenic to produce silicon for use in transistors, solar cells, rectifiers, and other solid-state devices, which are used extensively in the electronics and space-age industries.
Though silicon was originally discovered in 1810 and thought to be a compound silicon was discovered as an element in 1823 by Jons Berzelius. In 1824 Berzelius prepared amorphous silicon by the same general method and purified the product by removing the fluosilicates by repeated washings. Deville in 1854 first prepared crystalline silicon, the second allotropic form of the element. Davy in1800 thought silica to be a compound and not an element; later in 1811, Gay Lussac and Thenard probably prepared impure amorphous silicon by heating potassium with silicon tetrafluoride.
Silicon is a metalloid at room temperature with an atomic number of 14, 14 electrons, 14 neutrons, and an average atomic mass of 28.0855. In its pure form,silicon melts at 2,570 degrees, and boils at 4,271 degrees Fahrenheit. This element belongs to the metalloid family, the 14th family on the periodic table of elements. This element is a solid metalloid at room temperature and turns to liquid at 2,570 degrees. Silicon is prepared as a brown amorphous powder or as gray-black crystals. Crystalline silicon has a metallic luster and grayish color. It is hard, non-magnetic, and most acids do not effect it, but it does dissolve in hydrofluoric acid, forming the gas, silicon tetrafluoride, SiF 4. At ordinary temperatures silicon is impervious to air, but at high temperatures it reacts with oxygen, forming a layer of silica that does not react further. At high temperatures it also reacts with nitrogen and chlorine to form silicon nitride and silicon chloride, respectively. Elemental silicon transmits more than 95% of all wavelengths of infrared, from 1.3 to 6.y micro-m.
Silicon is present in the soil and makes up about 25.7% of the earth’s crust. Silicon also promotes firmness and strength in human tissues. It is part of the arteries, tendons, skin, connective tissue, and eyes.
The Bitter Pill by Brill Steven addresses the problem attached to medical bills in small towns across the country. Brill feels that American health care is eating away our economy and our treasure and discusses the costs associated with the provision of health care services in the U.S. The article explores the medical world through the medical experience encountered by a 50-year-old Scott S. and his wife Rebecca S. from the surrounding suburb near Dallas Texas. How is it possible that a laboratory work for a breathing problem cost $132,303?
Hans Christian Orstead, Danish chemist, first isolated aluminum in 1825, using a chemical process involving potassium amalgam. Between 1827 and 1845, Friedrich Wöhler, a German chemist, improved Oersted's process by using metallic potassium. He was the first to measure the specific gravity of aluminum and show its lightness. In 1854 Henri Sainte-Claire Deville, in France, obtained the metal by reducing aluminum chloride with sodium. Aided by the financial backing of Napoleon III, Deville established a large-scale experimental plant and displayed pure aluminum at the Paris Exposition of 1855.
Throughout the entirety of The Great Gatsby, by F. Scott Fitzgerald, the “eyes” of Doctor T. J Eckleburg are brought up as being able to see everything. It chapters eight and nine, this idea is furthered pressed by Wilson implying that these eyes are the eyes of God himself. As I was reading the book this always stood out to me as being important and I believed that the eyes represented someone who was able to see everything and see through any sort of facade people are putting up. The idea of them being the eyes of God makes even more sense than this though. After Myrtle’s death, her husband, Wilson, is in a very bad state of mind. The reader may think that he is simply losing his mind, but what he is saying makes sense in a more symbolic way.
Like a deer in headlights, blind and lost, will lead to misdirection from the truth. In the novel “ The Great Gatsby” by F. Scott Fitzgerald is a Historical Fiction book. The story takes place in New York during the American Dream in the 1920s. The characters in the story are blinded, all seeing, and find treatment from the blindness by their own perception of reality.
Karl Marx wrote the Communist Manifesto in order to give a voice to the struggling classes in Europe. In the document he expressed the frustrations of the lower class. As Marx began his document with "the history of all hitherto societies has been the history of class struggles" he gave power to the lower classes and sparked a destruction of their opressors.1 He argued that during the nineteenth century Europe was divided into two main classes: the wealthy upper class, the bourgeoisie, and the lower working class, the proletariat. After years of suffering oppression the proletariats decided to use their autonomy and make a choice to gain power. During the eighteenth and nineteenth century the proletariats were controlled and oppressed by the bourgeoisie until they took on the responsibility of acquiring equality through the Communist Manifesto.
Fundamental studies by Stober [ ], Meyer and Heckerman [ ] , and Bering and Serpinskii [ ] indicate that silica surface consists of siloxane network in the bulk, while the hydroxyl groups are attached onto silicon atoms. However these groups are not equivalent in their adsorption or reaction behavior. Fig 1a represents a general arrangement on a silica surface. Belyakova et al. identifies that the number of hydroxyl (Silanol) group on different type of silica surfaces are same i.e. 4 -5 SiOH groups per nm2. Lange [ ] identifies that water associates with these silanol groups in two ways, by hydrogen bonding or by physically adsorbed. Dalton and Iler [ ] states that there is at least a monolyer of water immobilized on silanol groups due to hydrogen bonding, this “glassy layer” protects underlying silica network from foreign molecules. Klier and Zettlemoyer [ ] indicates that water sat “oxygen down” on silanol groups. De Boer and Vleeskens [ ] argued that around 120 oC in ambient air silica looses adsorbed water unless it is present in micropores which would otherwise tak...
This paper discusses Lenin’s contribution to Marxist political theory and his vision for the revolutionary party.
- Each of the mitts has silicone material all over the surface. They are made out of 100% quilted cotton and can resist heat up to 400 F Max. I like how these are soft, smooth and comfortable to wear. I was able to bake cookies and make cakes without getting burnt. These gloves are very flexible and offer an excellent grip. The silicone
It was discovered by Sir Humphrey Davy in England, in 1807. Sir Davy was able to isolate potassium using electrolysis. Potassium was the first metal isolated by this procedure. Today, it is still not found free in nature. It is obtained by electrolysis of chloride or hydroxide.
...does he master the common form of imagery in description using the five senses, but he also delves into the world of inner human thought and sentiment. Fitzgerald’s imagery dives into the issues that have surrounded human nature throughout history including morality, flaws, instinct, and perspective in a new manner. The reader is taken through a simple story that follows characters in their daily trials involving love, jealously, and leisure, but in doing so through Nick Caraway’s eyes, the deceivingly straightforward actions become much more. From Fitzgerald using his skill to explore human nature through his narrator’s thoughts and observations of the world around him to his use of color imagery to represent more than meets the eye about personality and emotion, The Great Gatsby is truly a novel of the ages that reveals the innermost complexities of human life.
Karl Marx is often called the father of communism, but his life entailed so much more. He was a political economist, philosopher, and idea revolutionist. He was a scholar that believed that capitalism was going to undercut itself as he stated in the Communist Manifesto. While he was relatively ambiguous in his lifetime, his works had tremendous influence after his death. Some of the world’s most powerful and most populace countries follow his ideas to this day. Many of history’s most eventful times were persuaded by his thoughts. Karl Marx was one of the most influential persons in the history of the world, and a brief history of his life will show how he was able to attain many of his attitudes.
One of the greatest debates of all time has been regarding the issue of the freedom of mankind. The one determining factor, for Marx, it that freedom is linked with class conflict. As a historian, Karl Marx traced the history of mankind by the ways in which the economy operated and the role of classes within the economy. For Marx, the biggest question that needed to be answered was “Who owns freedom?” With this in mind, Marx gives us a solution to both the issues of freedom and class conflict in his critique of capitalism and theory of communism, which is the ideal society for Marx. His theory of communism is based on the “ultimate end of human history” because there will be freedom for all humankind. Marx saw communism as the ideal society because it is "the genuine resolution of the conflict between man and man- the true resolution of the strife between existence and essence...between freedom and necessity" that capitalism fosters. Marx was also committed to the notion that theory and action go hand in hand. Marx dismissed earlier thinkers because they (philosophers) "have only interpreted the world in various ways; the point, however, is to change it." He also stated "Ideas cannot carry out anything at all. In order to carry out ideas men are needed who can exert practical force". However, Marx would have been appalled by the way his theory of communism was misused. It can be said, though, that Marx's theory of communism was clearly open for interpretation because he failed to offer "principles or guidelines of even the most general kind" for how the system of communism was to be fully established. It was this opportunity for interpretation that made Marx's theory of communism doomed for failure when it was used in practice.
In 1848, Karl Marx became renowned for his work, The Communist Manifesto, which was considered one “of the most eloquent and undoubtedly the most influential political pamphlet ever published…” (Waugh 140). Marxism, as it later became known as, explored “the intellectual rationale of the numerous Communist and Socialist parties” (Waugh 140). The foundation of Marxist views relied on that of class struggle: “Marxist criticism must always insist upon the issue of class relations, and class struggle, in unlikely contexts no less than likely ones” (Waugh 143). Works dealing with Marxism must, then, show the difference in classes, and the struggle and plight that the lower class faces at the hand of the upper class. It was also the Marxist belief that in order to exact social change, the masses would need to come together and cause a social upheaval.
Some creative ideas are amazing, simple and others complex. Creativity is a process, and it improves when a person continually work hard and come out with new ideas. Harris (1998)