多核ヒドロキソアルミニウム-第4級アンモニウムイオン系複合ゲルから得られる透明性γアルミナの細孔径制御

概要

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The addition of surfactants of quaternary ammonium ions(QAI)to polynuclear hydroxoaluminum(PHA)ion solution having a OH/Al ratio of 2.50 led to transparent composite gels on drying. The composite gels were transformed into a single phase of γ-alumina upon heating above 600°C. The size of γ-alumina crystallites gradually increased with increasing temperature up to 900°C. The addition of QAI resulted in marked increases of specific surface area and pore volume of γ-alumina, giving a sharp monomodal pore size distribution. The pore sizes depend on the chemical species and the content of QAI ; especially, the dependency of the pore sizes on the bulkiness of QAI suggests that the pore formation is determined by the so-called template mechanism of QAI micelles. These results indicate that the pore sizes of γ-alumina are precisely controllable in the range of 4-8 nm by the PHA-QAI composite gel technique. The γ-alumina sheets thus obtained showed transparency due to the lack of macropores and the homogeneous distribution of uniform mesopores.
社団法人日本セラミックス協会の論文
1999-04-01