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KMID : 1059519960400080535
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Journal of the Korean Chemical Society
1996 Volume.40 No. 8 p.535 ~ p.541
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Condition and Mechanism of Precipitation of Intravesicular Aluminum Ion in Preparation of Monodispersed Spherical Fine Particles With Use of Vesicles
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Chung Jong-Jae
Kim Chang-Hyun
Lee Byung-Kyo
Lee Chang-Seop
Lee Hye-Wook
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Abstract
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In preparation of fine alumina powders with use of vesicle, the effect of variation of pH in extravesicular dispersion system to mechanism of precipitation and shape and size distribution of precipitate was investigated. The results of observation by TEM and turbidimeter were obtained as follows. Reaction between aluminum ion and hydroxyl ion to produce precipitate within vesicle was initiated at pH 11.4 and spherical fine precipitates, about 50 nm size, were formed at pH 12.0. About pH 12.3, size of precipitates in vesicle grew twice as great as those formed below pH 12.0 because of the agglomeration and coalescence of vesicleswith time.
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