Effect of La addition on thermal microstructural evolution of macroporous alumina monolith prepared from ionic precursors(<Feature>Aqueous Solution Science for Ceramic Processing II)
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概要
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Porous alumina monoliths with high thermal stability have been prepared using sol-gel processing from ionic precursors. Samples were synthesized from AlCl_3・6H_2O and LaCl_3・7H_2O dissolved in a H_2O/etanol solution containing poly(ethylene oxide) (PEO) via propylene oxide (PO) involved sol-gel reaction accompanied by phase separation. The heat-treated gels consist of controllable size of macropores and La-doped alumina skeletons. Doped lanthanum ions are homogeneously embedded in the gel matrix, which retards the phase transition from γ-alumina to α-alumina during the sintering. The 3mol% La-doped aluminate exhibits the BET surface area of 55.3m^2/g, after the heat treatment at 1100℃ for 24h. Drying condition are also related to the thermal stability of obtained gels. Aluminate aerogels show higher thermal stability than corresponding xerogels due to relatively large mesopore size and high porosity. As a result, the 3mol% lanthanum doped aluminate aerogel shows BET surface area as high as 82.5m^2/g even after heat treatment at 1100℃ for 24h.
- 社団法人日本セラミックス協会の論文
- 2009-03-01
著者
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NAKANISHI Kazuki
Department of Chemistry, Graduate School of Science, Kyoto University
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Hanada Teiichi
Department Of Chemistry Graduate School Of Science Kyoto University
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TOKUDOME Yasuaki
Department of Chemistry, Graduate School of Science, Kyoto University
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Tokudome Yasuaki
Department Of Chemistry Graduate School Of Science Kyoto University
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Nakanishi Kazuki
Department Of Chemistry Graduate School Of Science Kyoto University
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