非离子型微乳状液制备均分散硫化镉

Preparation of Monodispersed Colloids of CdS by Nonionic Microemulsion

近年来,半导体胶体CdS溶胶或悬浮液已引起人们极大兴趣,其原因在于它的光电性质,特别是它的光化学性质及光催化性质。而上述性质均与CdS胶体粒子的大小和形状密切相关,所以作为光能转换及光催化反应的硫化镉溶胶不仅纯度要求高,而且对粒子的尺寸、形状及均匀性的要求也银严格。目前,主要用水解法。

The present paper reports the method that the monodispersed particles of cadmium sulfide are formed by precipitation in the nonionic microemulsion. The microemulsion consisting of Cd2+ ions was mixed with that consisting of S2- ions at 25 ℃- Various sizes and shapes of monodispersed particles of CdS have been obtained by adjusting the constitution of the microemulsion consisting of Tx-10-cyclohexane-octanol, ions concentration and different cadmium salts. Furthermore, the conditions affecting the particle size and shape, the relationship between the reactants and the precipitation regions are studied and the effects of ions on the mierocircumstance in the microemulsion are discussed.