High ionic strength electrokinetics of melamine–formaldehyde latex

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• 作者：Marek Kosmulski ; Per Dahlsten ; Piotr Pró ; chniak and Jarl B. Rosenholm
• 关键词：Zeta potential ; Isoelectric point ; Latex ; Ionic strength ; HSAB principle
• 刊名：Journal of Colloid and Interface Science
• 出版年：2006
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 September 2006
• 卷：301
• 期：2
• 页码：538-541
• 文件大小：130 K

摘要

The electrokinetic potential of melamine–formaldehyde latex at high ionic strengths was measured by means of two different instruments. The present study confirms that the ζ potentials in 1 M 1–1 electrolyte solutions can be as high as ±20 mV. The IEP of latex at low ionic strengths was at pH 11. The increase in the electrolyte concentration induced a shift in the IEP to low pH for all studied salts, and this indicates specific adsorption of the anions. The magnitude of the shift depends chiefly on the nature of the anion and increases in the series Cl<NO₃