THE PH-DEPENDENCE OF DISPERSION OF TIO2 PARTICLES IN AQUEOUS SURFACTANT SOLUTIONS
THE PH-DEPENDENCE OF DISPERSION OF TIO2 PARTICLES IN AQUEOUS SURFACTANT SOLUTIONS
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DOI：
10.1007/bf00654658
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发表时间：
1991-01-01
影响因子：
2.4
通讯作者：
IKEDA, S
中科院分区：
文献类型：
--
作者：
IMAE, T;MUTO, K;IKEDA, S
在表面活性剂分子存在的水中，研究了二氧化钛粒子分散的pH依赖性。在十二烷基硫酸钠(十二烷基硫酸钠)水溶液中的中性区域和十二烷基二甲胺氧化物(C12DAO)水溶液中的酸性和碱性区域，粒子的分散性增强。考虑Zeta电位的pH依赖性，基于半胶束模式和双层压缩模式，估算了表面活性剂分子在颗粒上的吸附模型。而吸附Al~(3+)的颗粒在pH=6附近有明显的分散，而在加入SDS的情况下，其分散性与pH关系不大，说明在整个pH范围内，SDS分子的吸附形成了双层压缩。动态光散射和电子显微镜观察表明，颗粒以细小的絮状物分散在水中。
The pH dependence of dispersion of titanium dioxide (TiO2) particles has been examined in the presence of surfactant molecules in water. Whereas particles were dispersed in water at acid and alkaline regions rather than at neutral region, the dispersion was enhanced at neutral region in an aqueous sodium dodecyl sulfate (SDS) solution and at acid and alkaline regions in an aqueous dodecyldimethylamine oxide (C12DAO) solution. Considering the pH dependence of zeta potential, the adsorption models of surfactant molecules on a particle were estimated on the basis of the modes of hemimicelle and double-layer compression. While the particles that adsorbed Al3+ were remarkably dispersed around pH 6, their dispersion does not largely depend on pH in the addition of SDS, indicating the adsorption of SDS molecules to form double-layer compression in the whole pH region. Dynamic light-scattering measurement and electron microscopic observation suggested that the particles were dispersed in water as small flocs.