Studies on the internal surface of porous glass and chemical modification thereof.
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Porous glass powders (CPG) prepared by spinodal phase separation, and silica gel showed IR spectra (Figs.3 and 4) typical of so called isolated silanol hydroxyl groups on glass surface, when they were dehydrated by heating in dessicated air stream. Porous glass (SPG) prepared from volcanic sand as silicon source, which contains alminium up to 15% as Al<SUB>2</SUB>O<SUB>3</SUB> (Table 2), adsorbed water more quickly than CPG (Fig.8), and it was fairly difficult to get simplified surface structure uniquely consisting of silanol hydroxyl groups, without any extraction of aluminium (Figs.2 and 6).<BR>Surface density of am inoalkyl groups on the surface of porous glasses, either of CPG or of SPG which was dehydrated and followed by chemical modification with (aminoalkyl)trimethoxysilane, was estimated according to the method of Gisin who had used it for aminomethylated polystyrene in Merrifield's method of solid-phase peptide synthesis. The surface densities of amino groups were about 2 μmol.m<SUP>-2</SUP> for both CPG and SPG as shown in Fig.10and 11. The value corresponds to 1/3 of the density of silanol hydroxyl groups, 7-9 μmol.m<SUP>-2</SUP>, estimated from the data of water elimination measurements of porous glasses (Tab le 4)by assuming the elimination of a water molecule from every two hydroxyl groups.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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