金属アルコキシドから作ったAl_2O_3-SiO_2系ゲルの構造に及ぼす加水分解条件の影響

概要

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The effect of hydrolysis conditions on the structure of gels was studied on the Al-O-SiO alkoxides containing up to 33 mol% Al_2O_3 in the system Al_2O_3-SiO_2. The synthesized Al-O-Si alkoxides consisted of chainlike polymers, which were aggregated into three-dimensional branched polymers with increasing water content. Alkoxide solutions which were hydrolyzed with more than 4 moles of water and HCI of low concentration comprised three-dimensional branched polymers, in which Al^<3+> ions were mainly four oxygen-coordinated. And the gels were considered to consist of the aggregates of primary particles with a diameter of 70 Å. On the other hand, when hydrolyzed with more than 4 moles of water and HCI of high concentration, Al^<3+> ions became six oxygen-coordinated, which resuted in disaggregation of three-dimensional branched polymers into chain-like ones. In gels from this solution, water remained even on heating at high temperature.
社団法人日本セラミックス協会の論文
1990-01-01