An earlier suggestion that various allotropic forms of carbon preexist as micron size crystallites in glassy carbon was investigated. Samples previously heated only to 1000 C and thinned by crushing (grinding) or by ion melting and observed using transmission electron diffraction and microscopy gave single crystal or spotty ring patterns for the former but only diffuse rings for the latter. Wide range X-ray diffraction, small angle X-ray scattering, density and surface area measurements of as received plate and ground material show that grinding flattens the internal pore structure of the material, decreasing the specific surface area by 25 percent and …
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Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States)
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Berkeley, California
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An earlier suggestion that various allotropic forms of carbon preexist as micron size crystallites in glassy carbon was investigated. Samples previously heated only to 1000 C and thinned by crushing (grinding) or by ion melting and observed using transmission electron diffraction and microscopy gave single crystal or spotty ring patterns for the former but only diffuse rings for the latter. Wide range X-ray diffraction, small angle X-ray scattering, density and surface area measurements of as received plate and ground material show that grinding flattens the internal pore structure of the material, decreasing the specific surface area by 25 percent and increasing the radius of gyration by about 8 percent, It is concluded that the spot patterns indicating crystalline forms result from strain relief during grinding.
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Baker, D. F.; Bragg, R. H. & Rao, A. S.Effect of Grinding on the Stucture of Glassy Carbon,
article,
December 1, 1979;
Berkeley, California.
(https://digital.library.unt.edu/ark:/67531/metadc842408/:
accessed May 27, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
