Growth mechanism of cadmium sulfide ultrafine particles in water-in-oil microemulsion

被引:28
作者
Suzuki, K
Harada, M
Shioi, A
机构
[1] Institute of Atomic Energy, Kyoto University, Uji
关键词
semiconductor; particle growth; microemulsion; ultrafine particle; cadmium sulfide;
D O I
10.1252/jcej.29.264
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The growth mechanism of CdS ultrafine particles in water-in-oil microemulsions was investigated. The growth occurs via a irreversible particle coagulation process. Its rate constant is dependent on the agglomeration number of a particle n. At small agglomeration numbers, the rate constant k is about 10(7)dm(3)mol(-1)s(-1). It decreases dramatically to about 10(3)dm(3)mol(-1)s(-1) at a critical agglomeration number n(c) followed by a further decrease in k above 2n(c). This causes sharpening of the size distribution near n(c) and 2n(c). A simple model based on the coagulation process with n-dependent rate constants is proposed, which explains well the experimental results. The effects of initial mixing and the feed ratio of Cd2+ to S2- are understood well by the proposed model. The relationship between n(c) and the stables supramolecules composed of CdS particles was discussed.
引用
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页码:264 / 276
页数:13
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