Analysis of Surface of Porous Glass

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The density of surface silanol groups in three kinds of porous glasses with different pore structures was determined by using CH3Mgl, (CH3)3SiCl(TMS), (CH3)2Cl2(DMS) and CH3OH. The density ranged from 2.3 to 7.7μmol/m2. The density determined by TMS was about 3μmol/m2 regardless of the pore structures. The surface of porous glasses was boron-rich after exposure to air for a long period. But, washing with acid solution removed boron, and the surface contained only silicon. The number of silanol group of single type was dominant in all types of silanol groups and occupied 50-80% regardless of the pore structures. Geminal type comes second. But, when pore was small, the number of geminal type was almost the same as that of paired type.