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
Modern tests demonstrate soundness of old iron bridge
Dec 21, 2009 |
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An unusual bowstring truss iron bridge that carried traffic across Roaring Run in Bedford County, Va. for almost 100 years is now a picturesque footbridge at the I-81 Ironto, Va. rest stop. Built in 1878, ...
System developed to detect plastic anti-personnel mines
Dec 22, 2009 |
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A team of European researchers has devised a method for locating plastic anti-personnel mines, which are manufactured to avoid detection by metal detectors. The technique involves analysing the temperature ...
Scientists build 'single-atom transistor'
Dec 06, 2009 |
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(PhysOrg.com) -- Researchers from Helsinki University of Technology (Finland), University of New South Wales (Australia), and University of Melbourne (Australia) have succeeded in building a working transistor, ...
New Bacterial Behavior Discovered
Dec 15, 2009 |
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(PhysOrg.com) -- Bacteria dance the electric slide, officially named electrokinesis by the USC geobiologists who discovered the phenomenon.
Flight of fancy: MIT autonomous mini-helicopter solves one tough challenge
Dec 03, 2009 |
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In its first 18 years, the Association for Unmanned Vehicle Systems International’s annual aerial-robotics competition posed four successive challenges, which robotics researchers had to meet using entirely ...
Researchers develop cheap, easy 'kitchen chemistry' to perform formerly complex synthesis
Chemistry / Analytical Chemistry
Dec 04, 2009 |
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A team at The Scripps Research Institute has made major strides in solving a problem that has been plaguing chemists for many years: how best to break carbon-hydrogen bonds and then to create new bonds to join molecules together. ...
Valuable, rare, raw earth materials extracted from industrial waste stream
Dec 15, 2009 |
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Fierce competition over raw materials for new green technologies could become a thing of the past, thanks to a discovery by scientists from the University of Leeds.
Panasonic Starts Mass-Production of High-Capacity 3.1 Ah Lithium-ion Battery
Dec 18, 2009 |
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Panasonic Corporation developed a 18650-type high-capacity 3.1 Ah lithium-ion battery and began mass production of the battery this December. The new 3.1 Ah battery has a nickel positive electrode and an energy density of ...
Suzaku spies treasure trove of intergalactic metal
Dec 02, 2009 |
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Every cook knows the ingredients for making bread: flour, water, yeast, and time. But what chemical elements are in the recipe of our universe?
Tadpoles Used to Rapidly Detect Water Pollution
Dec 03, 2009 |
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(PhysOrg.com) -- Research conducted by University of Wyoming Professor Paul Johnson and others demonstrates that genetically modified tadpoles work well as sensitive monitors for rapidly detecting water pollution.
Nanoparticle protects oil in foods from oxidation, spoilage
Nanotechnology / Nanomaterials
Dec 08, 2009 |
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(PhysOrg.com) -- Using a nanoparticle from corn, a Purdue University scientist has found a way to lengthen the shelf life of many food products and sustain their health benefits.
Researcher uses bacteria to make radioactive metals inert
Sep 08, 2009 |
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The Lost Orphan Mine below the Grand Canyon hasn't produced uranium since the 1960s, but radioactive residue still contaminates the area. Cleaning the region takes an expensive process that is only done in ...
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 ...
Older dental fillings contain form of mercury unlikely to be toxic
Dec 09, 2009 |
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A new study on the surface chemistry of silver-colored, mercury-based dental fillings suggests that the surface forms of mercury may be less toxic than previously thought. It appears online in ACS' journal ...
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 ...
