胶体悬浮液中电动力带形成的电光观察

B. Jennings, M. Stankiewicz
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引用次数: 10

摘要

在静态和低频电场中,悬浮的胶体颗粒倾向于沿电场线形成“弦”或“珍珠链”。已经观察到一种现象,在长时间的交变电场下,水性或导电介质中的胶体颗粒表现出电动力学不稳定性,它们聚集成高浓度的“带”,这些“带”基本上垂直于施加的电场矢量。本文对盘状矿物高岭石的水悬浮液进行了详细的研究。一种包含“珍珠链”和“带”形成的理论已经发展起来,表明随着频率和场强的增加,一种可以从另一种形成,并说明了在相关的电光实验中观察到的带形成对电泳迁移率的依赖。作为一种将分散的胶体颗粒集中到非常高的局部密度区域的机制,这种现象的价值是显而易见的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electro-optic observations of electrodynamic band formation in colloidal suspensions
In static and low-frequency electric fields, colloidal particles in suspension tend to associate into ‘strings’ or ‘pearl chains’ along the field lines. A phenomenon has been observed in which, under long duration alternating electric fields, colloidal particles in aqueous or conducting media exhibit an electrodynamic instability in which they gather into high concentration ‘bands’ which run essentially perpendicular to the applied field vector. A detailed study is catalogued herein for aqueous suspensions of the discotic mineral kaolinite. A theory has been developed, which embraces the ‘pearl chain’ and ‘band’ formations, demonstrating that one can be formed from the other with increasing frequency and field strength and illustrating the dependence of band formation on electrophoretic mobility as observed in related electro-optical experiments. The value of the phenomenon as a mechanism for concentrating dispersed colloidal particles into regions of very high local density is apparent.
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