Low-temperature superplasticity in nanostructured nickel and metal alloys
Article Abstract:
Research into low-temperature superplasticity in nanocrystalline nickel, a nanocrystalline aluminium alloy and nanocrystalline nickel aluminide indicates that mechanistic details of superplasticity in nanocrystalline materials differ very significantly from those in microcrystalline materials. The most important observation in this research was the large reduction in superplastic temperatures. With nickel, a very low normalized temperature was achieved. It appears that it is not possible to obtain superplasticity in pure metals with a grain size of 100 nm or less, as the fall in superplastic temperature is balanced out by a reduction in the grain-growth temperature.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Will solid hydrogen ever be a metal?
Article Abstract:
Metallic hydrogen could have unusual properties and significant applications and theoretically can be made from liquid hydrogen. Dense solid hydrogen, however, has resisted all attempts to date at metallization. Two scientists have discovered that this might be due to a spontaneous asymmetry of hydrogen dimer molecules at ultra high pressures, which results in the hydrogen molecule developing a permanent electric dipole moment. This dipole moment then delays or blocks completely the transition of dense solid hydrogen to the metallic state.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Open season for solid frameworks
Article Abstract:
An innovative metal-organic framework offers a new approach to designing microporous structures from first principles. The new compound produced by this research - Zn4O(BDC)3, where BDC is benzenedicarboxylate - can be seen as the prototype for a third generation of open frameworks with several advantages over traditional zeolites. The most significant outcome of this research will probably be the enhanced ability to engineer microporous structures and tailor cavities and channels in a specific way.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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