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Attractive non-DLVO forces induced by adsorption of monovalent organic ions

机译:通过对单价有机离子的吸附引起的有吸引力的非DLVO力

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摘要

Direct force measurements between negatively charged colloidal particles were carried out using an atomic force microscope (AFM) in aqueous solutions containing monovalent organic cations, namely tetraphenylarsonium (Ph4As+), 1-hexyl-3-methylimidazolium (HMIM+), and 1-octyl-3-methylimidazolium (OMIM+). These ions adsorb to the particle surface, and induce a charge reversal. The forces become attractive at the charge neutralization point, but they are stronger than van der Waals forces. This additional and unexpected attraction decays exponentially with a decay length of a few nanometers, and is strikingly similar to the one previously observed in the presence of multivalent ions. This attractive force probably originates from coupled spontaneous charge fluctuations on the respective surfaces as initially suggested by Kirkwood and Shumaker.
机译:使用由含有一价有机阳离子的水溶液中的原子力显微镜(AFM)进行带负电荷的胶体颗粒之间的直接力测量,即四苯基胂(pH4As +),1-己基-3-甲基咪唑鎓(Hmim +)和1-辛基-3 - 甲基咪唑鎓(OMIM +)。 这些离子吸附到颗粒表面,并诱导电荷反转。 力量在电荷中和点变得有吸引力,但它们比范德瓦尔斯力量强。 这种额外的和意外的吸引力呈指数衰减,衰减长度为几纳米,并且与在多价离子的存在下之前观察到的人的尖锐相似。 这种吸引力可能来自各个表面上的耦合自发电荷波动,最初由Kirkwood和Shumaker建议。

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