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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Growth of carbon micro-trees

Article Abstract:

It is possible to tailor carbon surfaces while they are growing just by controlling the rate of deposition from the vapour phase. Research in this area has demonstrated the growth of micron-sized tree-like carbon structures produced by chemical vapour deposition of methane without the use of any catalysts. High-resolution transmission electron microscopy images of the outer zones indicate the structure of disordered graphite. The solid-like centre shows more disorder, suggesting that the cores experience lower growth temperatures.

Author: Nugent, J.M., Ajayan, P.M., Siegel, R.W., Wei, B., Kohler-Redlich, Ph.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
Vapor-plating, Vapor deposition, Carbon compounds

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Carbon nanotubes as removable templates for metal oxide nanocomposites and nanostructures

Article Abstract:

The nanotube-oxide composites are synthesized by regulated cooling of a mixture of vanadium pentoxide powder and incompletely oxidized nanotubes at a temperature above the melting point of the oxide. Using nanotubes as removable templates, thin-film ceramic nanostructures are fabricated. The internal cavities of the nanotubes undergo capillarity-induced oxide filling and thin oxide layers are formed between the concentric shells of the tubes.

Author: Ajayan, P.M., Stephan, O., Redlich, Ph., Colliex, C.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Usage, Oxidation-reduction reaction, Oxidation-reduction reactions, Surface tension, Vanadium pentoxide

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Capillarity-induced filling of carbon nanotubes

Article Abstract:

Liquid lead was drawn into graphitic carbon nanotubes using experimental capillary action. Transmission electron microscopy confirmed that annealing the nanotubes caused them to be filled with lead spontaneously. The opening of the nanotube tips probably requires their metal, oxygen and carbon components to interact chemically. This novel method for nano-fabrication may lead to nanometer-sized fibers or wires with many possible applications.

Author: Ajayan, P.M., Iijima, Sumio
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
Innovations, Cover Story, Nanotechnology

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Subjects list: Research
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