Surface and physical properties of microporous carbon spheres

被引：18

作者：

Ishii, C ^{[1
]}

Kaneko, K ^{[1
]}

机构：

[1] CHIBA UNIV,FAC SCI,DEPT CHEM,CHIBA 263,JAPAN

来源：

PROGRESS IN ORGANIC COATINGS | 1997年 / 31卷 / 1-2期

关键词：

mesocarbon microbeads; high surface area; micropore; micrographite; X-ray diffraction; magnetic properties;

D O I：

10.1016/S0300-9440(97)00030-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The surface area of activated mesocarbon microbeads (activated MCMBs) was determined by N-2 adsorption using the subtracting pore effect (SPE) method. The microcrystalline graphitic structure of activated MCMBs was determined by X-ray diffraction. Electron spin resonance (ESR) spectra and magnetic susceptibility were measured for analysis of structure and magnetic properties. Spin concentration and spin-lattice relaxation time (T-1) were determined from ESR data. The spin concentration of activated MCMB increased with the increase of surface area. The higher the surface area of activated MCMB, the longer the T-1. The longer T-1 indicates that micrographitic units of activated MCMB of higher surface area should be more isolated. A single electron spin was presumed to be situated on each micrographitic unit. The isolated spin system gave a random magnetism of a long magnetic relaxation (>3000 s). (C) 1997 Elsevier Science S.A.

引用

页码：147 / 152

页数：6

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