Electrokinetics at high ionic strengths: Alumina

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• 作者：Marek Kosmulski ; Per Dahlsten ; Piotr Pró ; chniak ; Jarl B. Rosenholm
• 关键词：Point of zero charge ; Isoelectric point ; Common intersection point ; Zeta potential
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2007
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：5 July 2007
• 卷：301
• 期：1-3
• 页码：425-431
• 文件大小：216 K

摘要

Electrophoresis was used to study ζ potentials of α-alumina in the presence of the following electrolytes: LiI, LiNO₃, NaCl, NaBr, NaNO₃, KCl, KNO₃, CsCl, at concentrations up to 2 M. Unexpectedly high values of the ζ potentials (up to 20 mV) were found at pH 4 in 1 M solutions of these electrolytes. The results obtained at pH > 9 in the presence of 1 and 2 M solutions of lithium salts suggest a shift in the IEP to high pH, which is analogous to a shift observed by means of electroacoustic method.