Engineering

Every noble metal atom counts in exhaust catalysts

Modern society heavily relies on transportation. The internal combustion engines that power most vehicles emit gaseous pollutants that are harmful to human health and to the environment. Catalytic removal of toxic carbon ...

Engineering

Composite metal foam on its way to influencing market

When mechanical and aerospace engineering professor Afsaneh Rabiei began developing composite metal foam, she looked to transform the transportation and military industries. Twenty years later, her product has the potential ...

Energy & Green Tech

Repurposing carbon dioxide may be key to net-zero emissions

While only a mere 0.04 percent of the atmosphere, carbon dioxide plays a vital role in sustaining life on our planet. However, if this delicate balance is disrupted, excess carbon dioxide can pose a formidable threat to our ...

Energy & Green Tech

Ultrasound can enable faster, more sustainable battery recycling

Known by expectant parents as the technology that enables them to see their child for the first time, ultrasound can be used at extremely low frequencies to serve an entirely different purpose. Researchers at KTH Royal Institute ...

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Metal

In 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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