Breaking ultrawide-bandgap semiconductor records is just like baking bread
Researchers have made unparalleled ultrawide-bandgap semiconductors through temperature and timing, just like baking bread.
Mar 30, 2021
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Electronics & Semiconductors
Researchers have made unparalleled ultrawide-bandgap semiconductors through temperature and timing, just like baking bread.
Mar 30, 2021
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207
Energy & Green Tech
Scientists based at the University of Oxford as part of the Faraday Institution CATMAT project researching next-generation cathode materials have made a significant advance in understanding oxygen-redox processes involved ...
Mar 1, 2021
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Energy & Green Tech
NASA is seeking proposals for ground and flight demonstrations of integrated megawatt-class powertrain systems for subsonic aircraft. The deadline for proposals for this solicitation is 5 p.m. EST April 20.
Feb 24, 2021
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Energy & Green Tech
Researchers at the Universidad Carlos III de Madrid (UC3M) have developed a new nanometric structure that can cover the surface of some silicon solar panels and improve their performance by up to 40%. This design could be ...
Feb 8, 2021
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Automotive
The VW Jetta Hybrid on the chassis dynamometer in Empa's Automotive Powertrains Technologies Laboratory had a couple of years of duty as a fleet vehicle. Strapped into the test chamber, it has been part of a new research ...
Jan 26, 2021
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Hardware
Ferroelectric memory is a well-researched topic in the past decade due to its capacity for higher speed, lower power consumption and longer endurance, compared to conventional flash memory. The performance of ferroelectric ...
Energy & Green Tech
Five years after the Paris climate agreement, all eyes are on the world's progress on the road to a carbon-free future. A crucial part of this goal involves the energy transition from fossil fuels to renewable sources, such ...
Jan 5, 2021
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Automotive
The European Union's top court ruled on Thursday that Volkswagen breached the law by installing on its cars a so-called defeat device to cheat on emission tests and cannot argue it was merely protecting car engines.
Dec 17, 2020
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Energy & Green Tech
A breakthrough in the design of lithium ion batteries could lead to the next generation of safer more reliable solid-state power cells.
Dec 16, 2020
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Electronics & Semiconductors
The oxygen evolution reaction (OER) is a chemical process that leads to the generation of molecular oxygen. This reaction is of key importance for the development of clean energy technologies, including water electrolyzers, ...
An oxide ( /ˈɒksaɪd/) is a chemical compound that contains at least one oxygen atom in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of −2.
Most of the Earth's crust consists of solid oxides. Oxides result when elements are oxidized by oxygen in air. Combustion of hydrocarbons affords the two principal oxides of carbon, carbon monoxide and carbon dioxide. Even materials that are considered to be pure elements often contain a coating of oxides. For example, aluminium foil has a thin skin of Al2O3 that protects the foil from further corrosion.
Virtually all elements burn in an atmosphere of oxygen, or an oxygen rich environment. In the presence of water and oxygen (or simply air), some elements—lithium, sodium, potassium, rubidium, caesium, strontium and barium—react rapidly, even dangerously, to give the hydroxides. In part for this reason, alkali and alkaline earth metals are not found in nature in their metallic, i.e., native, form. Caesium is so reactive with oxygen that it is used as a getter in vacuum tubes, and solutions of potassium and sodium, so called NaK are used to deoxygenate and dehydrate some organic solvents. The surface of most metals consists of oxides and hydroxides in the presence of air. A well known example is aluminium foil, which is coated with a thin film of aluminium oxide that passivates the metal, slowing further corrosion. The aluminium oxide layer can be built to greater thickness by the process of electrolytic anodising. Although solid magnesium and aluminium react slowly with oxygen at STP, they, like most metals, will burn in air, generating very high temperatures. Finely grained powders of most metals can be dangerously explosive in air. Consequently, they are often used in Solid-fuel rockets.
In dry oxygen, iron readily forms iron(II) oxide, but the formation of the hydrated ferric oxides, Fe2O3−2x(OH)x, that mainly comprise rust, typically requires oxygen and water. The production of free oxygen by photosynthetic bacteria some 3.5 billion years ago precipitated iron out of solution in the oceans as Fe2O3 in the economically important iron ore hematite.
Due to its electronegativity, oxygen forms chemical bonds with almost all elements to give the corresponding oxides. Noble metals (such as gold or platinum) resist direct chemical combination with oxygen, and substances like gold(III) oxide must be generated by indirect routes.
This text uses material from Wikipedia, licensed under CC BY-SA