Gravitational effects on diamond and carbon fiber fabrication

Statistics – Applications

Scientific paper

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Fullerenes And Related Materials, Decomposition Reactions

Scientific paper

One of the most interesting materials developments in the past several years has been the fabrication of carbon nanostructures such as C-60 and filaments based on the carbon lattice. Such structures, referred to informally as ``buckyballs,'' ``buckytubes'' or ``fullerenes,'' are fabricated by dissociating hydrocarbons in a high temperature chemically catalyzed environment. When the constraint of gravity is removed, it is very likely that exciting new chemical forms can be created, perhaps never before seen on earth. This is especially true for fiber forms, which are entrained in the natural thermal convection (i.e., density driven convection which depends upon the force of gravity) of the furnace. In addition, similar gas phase pyrolosis reactions are used to manufacture diamond fibers and diamond films. Gravity constrains the growth of diamond by requiring that they adhere to a nucleation point on a surface, which leads to limitations on the size of individual single crystals which can be grown. Accordingly, in microgravity, it may be possible that diamond of arbitrarily large size might be grown. Such materials can be expected to have a value which can justify their production in space.

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