Abstract

We demonstrate that the electrooptical method can be used to study the coagulation of liquid nanodisperse systems, in particular, colloids and suspensions. Two electrooptical effects have been used—one dependent and one independent of the polarization of light passing through the system in the electric field. The results of study of the coagulation kinetics at its early stage, associated with the formation of pair aggregates from graphite particles suspended in AlCl₃ and Th(NO₃)₄ aqueous electrolytes are presented. We show that the systems are stable in a wide range of electrolyte concentrations and lose their stability in a narrow range in which the electrokinetic potential of particles does not exceed 5 mV. We show that the electrooptically determined dependences of the particle concentration on the coagulation time at the isoelectric point agree well with the Smoluchowski theory of rapid coagulation.

中文翻译：

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研究纳米分散系统凝结的电光方法：在水电解质中形成石墨颗粒的聚集体

摘要

我们证明了电光方法可用于研究液体纳米分散系统，特别是胶体和悬浮液的凝结。已经使用了两种电光效应—一种与电场中通过系统的光的偏振相关，一种与偏振无关。研究早期凝固动力学的结果，与悬浮在AlCl ₃和Th（NO ₃）_4中的石墨颗粒形成成对聚集体有关提出了水性电解质。我们表明该系统在很宽的电解质浓度范围内是稳定的，并且在颗粒的电动势不超过5 mV的狭窄范围内会失去其稳定性。我们表明，在等电点上电光确定的颗粒浓度对凝固时间的依赖性与快速凝固的Smoluchowski理论完全吻合。