Metal
hideIn chemistry, a metal (Greek: Metallo, Μέταλλο) is an element, compound, or alloy characterized by high electrical conductivity. In a metal, atoms readily lose electrons to form positive ions (cations); those ions are surrounded by delocalized electrons, which are responsible for the conductivity. The thus produced solid is held by electrostatic interactions between the ions and the electron cloud, which are called metallic bonds.
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News tagged with metal
A coating for life: Biodegradable fibers advance stent technology and brain surgery, then disappear
Nov 24, 2009 |
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Stents that keep weakened and flabby arteries from collapsing have been true life-savers. But after six months, those stents are no longer needed -- once the arteries are strengthened, they become unnecessary. ...
Intelligence inside metal components
Nov 24, 2009 |
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Up to now, extreme production temperatures made it impossible to equip metallic components with RFID chips during the operating process. At Euromold in Frankfurt (Dec. 2-5), Germany, Fraunhofer researchers ...
Computer predicts reactions between molecules and surfaces, with 'chemical precision'
Chemistry / Analytical Chemistry
Nov 06, 2009 |
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Good news for heterogeneous catalysis and the hydrogen economy: computers can now be used to make accurate predictions of the reactions of (hydrogen) molecules with surfaces. An international team of researchers, headed by ...
Nanoparticles may cause DNA damage across a cellular barrier
Nanotechnology / Bio & Medicine
Nov 05, 2009 |
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(PhysOrg.com) -- Scientists have shown in the laboratory that metal nanoparticles damaged the DNA in cells on the other side of a cellular barrier. The research, by the University of Bristol, is published ...
How Size Matters For Catalysts: Study Links Size, Activity, Electronic Properties
Nanotechnology / Nanomaterials
Nov 05, 2009 |
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(PhysOrg.com) -- University of Utah chemists demonstrated the first conclusive link between the size of catalyst particles on a solid surface, their electronic properties and their ability to speed chemical ...
Metal Deficit in Mouse Brain Plaques Guides Direction of Human Alzheimer's Disease Research
Medicine & Health / Neuroscience
Nov 04, 2009 |
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(PhysOrg.com) -- Minuscule plaques in the brains of mice with Alzheimer's disease contain much less metal than the brains of affected humans, according to a study conducted at the NSLS. This surprising finding ...
Hybrid molecules show promise for exploring, treating Alzheimer's
Nov 04, 2009 |
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One of the many mysteries of Alzheimer's disease is how protein-like snippets called amyloid-beta peptides, which clump together to form plaques in the brain, may cause cell death, leading to the disease's devastating symptoms ...
Perfectly proportioned: Working to improve dry compaction and sintering
Nov 03, 2009 |
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(PhysOrg.com) -- The manufacture of parts by compaction and sintering involves filling a die with metal powder. Research scientists have simulated this process for the first time to achieve an evenly distributed ...
Lasers put a shine on metals
Nov 03, 2009 |
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(PhysOrg.com) -- Polishing metal surfaces is a demanding but monotonous task, and it is difficult to find qualified young specialists. Polishing machines do not represent an adequate alternative because they ...
Heavy metals accumulate more in some mushrooms than in others
Oct 30, 2009 |
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A research team from the University of Castilla-La Mancha (UCLM) has analysed the presence of heavy metals in 12 species of mushroom collected from non-contaminated natural areas, and has found that the levels ...
Researchers create all-electric spintronics
Oct 27, 2009 |
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A multidisciplinary team of UC researchers is the first to find an innovative and novel way to control an electron's spin orientation using purely electrical means.
EPA to limit mercury emissions from power plants
Oct 26, 2009 |
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The Environmental Protection Agency will put controls on the emissions of hazardous pollutants such as mercury from coal-fired power plants for the first time by November 2011, according to an agreement announced Friday to ...
Researchers make key step towards turning methane gas into liquid fuel
Oct 22, 2009 |
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(PhysOrg.com) -- Researchers at the University of Washington and the University of North Carolina at Chapel Hill have taken an important step in converting methane gas to a liquid, potentially making it more useful as a fuel ...
Carbenes: New molecules have wide applications
Oct 22, 2009 |
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Researchers at the University of California, Riverside have created in the laboratory a class of carbenes, highly reactive molecules, used to make catalysts - substances that facilitate chemical reactions. ...
Breakthrough with light could help viral research
Oct 20, 2009 |
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(PhysOrg.com) -- Researchers have developed a method using the force of light to gently trap, manipulate and study tiny, active objects as miniscule as viruses -- opening doors to expanded viral research.
