多价阳离子存在下二氧化硅粒子间的相互作用
Interactions between Silica Particles in the Presence of Multivalent Coions
摘要：
用基于原子力显微镜的胶体探针技术测量了多价共离子溶液中带电二氧化硅粒子间的作用力。系统地改变1：z电解质的浓度，以了解这些系统中的静电相互作用和双层性质的行为。虽然coions是多价的Derjaguin，Landau，Verwey和Overbeek（DLVO）理论完美地描述了测得的力的分布。利用DLVO理论从力分布中提取扩散层势和调节特性。扩散层电位和调节参数的依赖关系随着共离子价的增加而向较低浓度移动，当绘制为1：z盐浓度的函数时。有趣的是，如果将这些曲线绘制为单价反离子浓度的函数，则这些曲线会塌陷为主曲线。
英文摘要：
Forces between charged silica particles in solutions of multivalent coions are measured with colloidal probe technique based on atomic force microscopy. The concentration of 1:z electrolytes is systematically varied to understand the behavior of electrostatic interactions and double-layer properties in these systems. Although the coions are multivalent the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory perfectly describes the measured force profiles. The diffuse-layer potentials and regulation properties are extracted from the forces profiles by using the DLVO theory. The dependencies of the diffuse-layer potential and regulation parameter shift to lower concentration with increasing coion valence when plotted as a function of concentration of 1:z salt. Interestingly, these profiles collapse to a master curve if plotted as a function of monovalent counterion concentration.
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