极性液体与非极性表面接触的电动力学
Electrokinetics of Polar Liquids in Contact with Non-Polar Surfaces
摘要：
使用闭孔电渗法测量了几种极性质子（水、乙二醇、甲酰胺）以及极性非质子（二甲基亚砜）液体与三种非极性表面接触时的Zeta电位。测试表面是接枝在载玻片上的烷基硅氧烷、氟烷基硅氧烷和聚二甲基硅氧烷（PDMS）的化学吸附单层。所有这些液体在与非极性表面接触时表现出大量的电动力学，这些观察结果是：在氟碳化合物涂覆的表面上的电动力学效应是最强的;在PDMS接枝的表面上，该效应是最弱的。即使这些吸湿液体含有少量的水，目前基于氢氧根离子在界面处的吸附或预先存在的官能团（例如，硅烷醇基团）似乎不足以解释实验观察的各个方面。结果表明，如何无处不在的电动力学的现象是与极性液体接触这种明显被动的非极性表面。我们希望，这些结果将激发进一步的实验和理论研究，在这一重要的研究领域，具有潜在的实际意义。
英文摘要：
Zeta potentials of several polar protic (water, ethylene glycol, formamide) as well as polar aprotic (dimethyl sulfoxide) liquids were measured in contact with three non-polar surfaces using closed-cell electro-osmosis. The test surfaces were chemisorbed monolayers of alkyl siloxanes, fluoroalkyl siloxanes and polydimethylsiloxanes (PDMS) grafted on glass slides. All these liquids exhibited substantial electrokinetics in contact with the non-polar surfaces with these observations: the electrokinetic effect on the fluorocarbon-coated surface is the strongest; and on a PDMS grafted surface, the effect is the weakest. Even though these hygroscopic liquids contain small amounts of water, the current models of charging based on the adsorption of hydroxide ions at the interface or the dissociation of preexisting functionalities (e.g., silanol groups) appear to be insufficient to account for the various facets of the experimental observations. The results illustrate how ubiquitous the phenomenon of electro-kinetics is with polar liquids contacting such apparently passive non-polar surfaces. We hope that these results will inspire further experimental and theoretical studies in this important area of research that has potential practical implications.
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