Characterization of porous carbons with high resolution αs-analysis and low temperature magnetic susceptibility

The effectiveness of integrated characterization of porous carbons with different approaches such as the high resolution alpha(s)-method for N-2, adsorption, X-ray diffraction, and magnetic susceptibility measurement is shown. The theoretical basis for the high resolution alpha(s)-analysis for N-2, adsorption using GCMC simulation and the background of magnetic susceptibility of carbon are given. The applicability of the integrated characterization to changes of ACF with heating at 1473-3173 K in Ar is shown. The activated mesocarbon microbead (a-MCMB) and activated carbon aerogel (a-CA) were examined by the integrated characterization method. a-MCMB showed an unusual magnetic relaxation below 10 K due to random magnetism. The random magnetism was associated with the mutually isolated network structure of nanographitic units. a-CA also showed random magnetism at low temperature, which was associated with the spin isolated nanographitic structure similar to a-MCMB. (C) 1998 Elsevier Science B.V. All rights reserved.