| Project/Area Number |
07651014
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
無機工業化学
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| Research Institution | Shinshu University |
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Principal Investigator |
KITAJIMA Kunio Shinshu University, Faculty of Engineering, Professor, 工学部, 教授 (30021009)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Pillared clay / Expandable mica / Intercalation / hydroxoaluminum ion / Titania sol / Pore size distribution / Sintered body / Specific surface area / アルミナ架橋体 / クロミア架橋体 / フッ素雲母 / 多核ヒドロキソ錯体 / ナノコンポジット / ピラ-密度制御 |
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| Research Abstract |
In order to clarify the influence of interlayr cation species and layr charge upon formation and properties of oxide pillared fluorine micas, synthetic expandable fluorine micas having different interlayr cations and layr charges were allowed to react with hydroxoaluminum, hydroxochromium solutions and titania sol prepared by hydrolyzing titanium tetraisopropoxide (TTIP) with hydrochloric acid, respectively. The results were summarized as follows. 1)Intercalation of highly polymelyzed hydroxoaluminum ions resulted in the highest value of Al-content as well as the highest thermal durability for alumina pillared fluorine micas. 2)Alumina pillared fluorine micas were found to be sinterable, forming sintered bodies at 700ﾟC.3)Cation exchange selectivity of polycations for intercalation depended on layr charge of host crystals, resulting in larger average hydrolysis degree of interlayr compounds for lower layr-charged micas. 4)The relation between reation conditions and average hydrolysis rates of interlayr compounds were clarified. 5)More highly polymerized hydroxochromium ions were intercalated when reacted above 80ﾟC.6)The most appropriate reaction conditions of complex formation were decided to be [TTIP/HCl] ratio of 4, concentration of HCl used being 1 mol/dm^3 with reaction time of 180 min at 50ﾟC.7)Interlayr cation species of host micas had the profound influence on complex formation, resulting on different titania contents and surface areas of pillared micas in the order of K^+<Na^+<Li^+.8)Na_<x->-system was greatly influenced by layr charge, giving a maximum of titania content at x=0.6. This can be explained in terms of the counterbalancing between expandability and cation exchange capacity. 9)Thermal durability of titania pillared fluorine micas depended on titania content. 10)Part of interlayr titania was expelled from interlayr region onto crystal surfaces of mica to precipitate as anatase at higher temperatures.
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