|
Wacker Chemie
Wacker Chemie AG is a German multinational chemical company which was founded in 1914 by Alexander Wacker. The company is controlled by the Wacker family holding more than 50 percent of the shares. The corporation is operating more than 25 production sites in Europe, Asia, and the Americas. The product range includes silicone rubbers, polymer products like ethylene vinyl acetate redispersible polymer powder, chemical materials, polysilicon and wafers for the semiconductor industry. The company sells its products in more than 100 countries. As of 31 December 2015, 16,972 employees have been with Wacker. Corporate annual sales in 2015 were about 5,3 billion Euros, up 10% compared to 2014. The biggest production site of Wacker Chemie is the Burghausen plant in the south-east of Bavaria, Germany, with about 10,000 employees. The US headquarters was previously located in Adrian, Michigan. In 2022 Wacker opened a new US headquarters in Ann Arbor, Michigan. Business activity Wack ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Industry
The chemical industry comprises the companies that produce industrial chemicals. Central to the modern world economy, it converts raw materials (oil, natural gas, air, water, metals, and minerals) into more than 70,000 different products. The plastics industry contains some overlap, as some chemical companies produce plastics as well as chemicals. Various professionals are involved in the chemical industry including chemical engineers, chemists and lab technicians. History Although chemicals were made and used throughout history, the birth of the heavy chemical industry (production of chemicals in large quantities for a variety of uses) coincided with the beginnings of the Industrial Revolution. Industrial Revolution One of the first chemicals to be produced in large amounts through industrial processes was sulfuric acid. In 1736 pharmacist Joshua Ward developed a process for its production that involved heating saltpeter, allowing the sulfur to oxidize and combine with water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silicone Rubber
Silicone rubber is an elastomer (rubber-like material) composed of silicone—itself a polymer—containing silicon together with carbon, hydrogen, and oxygen. Silicone rubbers are widely used in industry, and there are multiple formulations. Silicone rubbers are often one- or two-part polymers, and may contain fillers to improve properties or reduce cost. Silicone rubber is generally non-reactive, stable, and resistant to extreme environments and temperatures from while still maintaining its useful properties. Due to these properties and its ease of manufacturing and shaping, silicone rubber can be found in a wide variety of products, including voltage line insulators; automotive applications; cooking, baking, and food storage products; apparel such as undergarments, sportswear, and footwear; electronics; medical devices and implants; and in home repair and hardware, in products such as silicone sealants. Curing In its uncured state, silicone rubber is a highly adhesive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrogenic Silica
Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density and high surface area. Its three-dimensional structure results in viscosity-increasing, thixotropic behavior when used as a thickener or reinforcing filler. Properties Fumed silica has a very strong thickening effect. Primary particle size is 5–50 nm. The particles are non-porous and have a surface area of 50–600 m2/g. The density is 160–190 kg/m3. Production Fumed silica is made from flame pyrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc. Major global producers are Evonik (who sells it under the name Aerosil), Cabot Corporation (Cab-O-Sil), Wacker Chemie (HDK), Dow Corning, Her ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knoxville News-Sentinel
The ''Knoxville News Sentinel, also known as Knox News,'' is a daily newspaper in Knoxville, Tennessee, United States, owned by the Gannett Company. History The newspaper was formed in 1926 from the merger of two competing newspapers: ''The Knoxville News'' and ''The Knoxville Sentinel''. John Trevis Hearn began publishing ''The Sentinel'' in December 1886, while ''The News'' was started in 1921 by Robert P. Scripps and Roy W. Howard. The two merged in 1926, with the first edition of ''The Knoxville News-Sentinel'' appearing on November 22 of that year. The editor from 1921 to 1931, Edward J. Meeman, later was sent to Memphis to edit the since defunct ''Memphis Press-Scimitar''. In 1986, the ''News-Sentinel'' became a morning paper, with the other paper in Knoxville, the '' Knoxville Journal'', becoming an evening paper. The ''Journal'' ceased publication as a daily in 1991, when the joint operating agreement between the two papers expired. In 2002, the paper dropped the hy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bradley County, Tennessee
Bradley County is a county located in the southeastern portion of the U.S. state of Tennessee. As of the 2020 census, the population was 108,620, making it the thirteenth most populous county in Tennessee. Its county seat is Cleveland. It is named for Colonel Edward Bradley of Shelby County, Tennessee, who was colonel of Hale's Regiment in the American Revolution and the 15th Regiment of the Tennessee Volunteers in the War of 1812. Bradley County is included in the Cleveland, Tennessee Metropolitan Statistical Area, which is also included in the Chattanooga-Cleveland-Dalton, TN- GA- AL Combined Statistical Area. History Indigenous peoples occupied this territory, especially along the waterways, for thousands of years before European contact. The first Europeans to see this area were likely Hernando De Soto and his expedition on June 2, 1540, while traveling through the Southeast interior of the North American continent. They encountered peoples of the South Appalachian Miss ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charleston, Tennessee
Charleston is a city in Bradley County, Tennessee, United States. The population was 664 at the 2020 census. It is included in the Cleveland Metropolitan Statistical Area. History The land now occupied by Charleston and Bradley County was home to the Cherokee long before European settlers arrived. What is now Charleston began around 1808 when Major John Walker Sr., a part-Cherokee grandson of Nancy Ward, established a ferry across the Hiwassee River between present-day Charleston and Calhoun. As a result, the community was initially known as "Walker's Ferry." The Hiwassee Purchase of 1819 resulted in the cession of Cherokee lands between the Hiwassee and Little Tennessee rivers to the Federal Government, and as a result, the Hiwassee River became the boundary between the Cherokee Nation and the United States, where it remained until the Cherokee removal in 1838. In 1821, the Cherokee Agency— the official liaison between the U.S. government and the Cherokee Nation— w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ethylene
Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula or . It is a colourless, flammable gas with a faint "sweet and musky" odour when pure. It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds). Ethylene is widely used in the chemical industry, and its worldwide production (over 150 million tonnes in 2016) exceeds that of any other organic compound. Much of this production goes toward polyethylene, a widely used plastic containing polymer chains of ethylene units in various chain lengths. Ethylene is also an important natural plant hormone and is used in agriculture to force the ripening of fruits. The hydrate of ethylene is ethanol. Structure and properties This hydrocarbon has four hydrogen atoms bound to a pair of carbon atoms that are connected by a double bond. All six atoms that comprise ethylene are coplanar. The H-C-H angle is 117.4°, close to the 120° for ideal sp² hybridized carbon. The molecule is also relatively weak: rota ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polysilicon
Polycrystalline silicon, or multicrystalline silicon, also called polysilicon, poly-Si, or mc-Si, is a high purity, polycrystalline form of silicon, used as a raw material by the solar photovoltaic and electronics industry. Polysilicon is produced from metallurgical grade silicon by a chemical purification process, called the Siemens process. This process involves distillation of volatile silicon compounds, and their decomposition into silicon at high temperatures. An emerging, alternative process of refinement uses a fluidized bed reactor. The photovoltaic industry also produces upgraded metallurgical-grade silicon (UMG-Si), using metallurgical instead of chemical purification processes. When produced for the electronics industry, polysilicon contains impurity levels of less than one part per billion (ppb), while polycrystalline solar grade silicon (SoG-Si) is generally less pure. A few companies from China, Germany, Japan, Korea and the United States, such as GCL-Poly, Wacker Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wafer (electronics)
In electronics, a wafer (also called a slice or substrate) is a thin slice of semiconductor, such as a crystalline silicon Crystalline silicon or (c-Si) Is the crystalline forms of silicon, either polycrystalline silicon (poly-Si, consisting of small crystals), or monocrystalline silicon (mono-Si, a continuous crystal). Crystalline silicon is the dominant semiconduc ... (c-Si), used for the fabrication of integrated circuits and, in photovoltaics, to manufacture solar cells. The wafer serves as the substrate (materials science), substrate for microelectronic devices built in and upon the wafer. It undergoes many microfabrication processes, such as doping (semiconductor), doping, ion implantation, Etching (microfabrication), etching, thin-film deposition of various materials, and Photolithography, photolithographic patterning. Finally, the individual microcircuits are separated by wafer dicing and Integrated circuit packaging, packaged as an integrated circuit. History I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silicon
Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive. Because of its high chemical affinity for oxygen, it was not until 1823 that Jöns Jakob Berzelius was first able to prepare it and characterize it in pure form. Its oxides form a family of anions known as silicates. Its melting and boiling points of 1414 °C and 3265 °C, respectively, are the second highest among all the metalloids and nonmetals, being surpassed only by boron. Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure element in the Earth's crust. It is widely distributed in space in cosmic dusts, planetoids, and planets as various forms of silicon dioxide ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adrian, Michigan
Adrian is a city in the U.S. state of Michigan and the county seat of Lenawee County. The population was 20,645 at the 2020 census. Adrian lies in Michigan's 7th congressional district. History Adrian was founded on June 18, 1826 by Addison Comstock. The original name for the village was Logan, but was changed soon after to Adrian, perhaps in reference to the Roman emperor Hadrian. The first operating railroad in Michigan was a horse-drawn train running between Adrian and Toledo in 1836. Adrian grew quickly, with the sixth largest population in the state when Michigan was admitted to the Union in 1837, and the third largest population in the state by 1860. Underground Railroad Evangelical and Hicksite Quakers in Southeast Michigan founded the first congregation of Quakers in Michigan in 1831. They also created a network of Underground Railroad stations in the Raisin River Valley. Daniel Smith was the first leader of the Raisin Valley Friends Meeting House. His daughter, Lau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
