Nanoporous carbon produced by ball milling

A nanoporous structure was produced in the samples of graphite after ball m illing at ambient temperature. The specific internal surface area of the mi cropores, as determined using the t-plot method, is higher than the externa l surface area of particles and mesopores. Phase transformations from hexag onal to turbostratic, and to amorphous structures were investigated using x -ray diffraction analysis and transmission electron microscopy. Formation o f the nanoporous structure is associated with that of the disordered carbon . The disordered and nanoporous structure is probably fullerene-like in nat ure. (C) 1999 American Institute of Physics. [S0003-6951(99)00319-8].