水熱処理した多核ヒドロキソアルミニウム-ヘキサデシルトリメチルアンモニウムイオン系複合ゲルから得られる透光性活性アルミナの細孔径制御

概要

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Translucent γ-alumina and θ-alumina sheets were obtained from polyhydroxoaluminum(PHA)-hexadecyltrimethylammonium ion(HTM)composite gels upon heating at 700 and 1000°C, respectively, provided that the corresponding mixed solutions of PHA-HTM were hydrothermally treated at 140-150°C before gelation. Dilution of PHA solution below 6.0% was also indispensable for obtaining translucent activated aluminas. The effect of hydrothermal treatment on diluted solutions resulted from the promotion of hydrolysis of PHA ions to form colloidal particles. Translucency of activated aluminas is due to their sharp monomodal pore size distribution. The pore size ranges from 8 to 21 nm, depending on both the hydrothermal temperature and the calcination temperature. All these facts indicate that pore sizes of γ- and θ-alumina are controllable.
社団法人日本セラミックス協会の論文
2000-02-01