Subnanometer Interfacial Forces in Three-Dimensional Atomic Force Microscopy: Water and Octane near a Mica Surface,The Journal of Physical Chemistry C

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Subnanometer Interfacial Forces in Three-Dimensional Atomic Force Microscopy: Water and Octane near a Mica Surface
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-11-18 , DOI: 10.1021/acs.jpcc.0c08092
J. Hernández-Muñoz ₁ , M. R. Uhlig ₂ , S. Benaglia ₂ , E. Chacón ₂ , P. Tarazona ₁ , R. Garcia ₂

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Three-dimensional force microscopy generates atomically resolved 3D images of solid–liquid interfaces. Here, we investigated the components of the interfacial force exerted by a tip on a mica–liquid interface by comparing density functional theory and experiments. The study involved two liquids: an aqueous solution of KCl (polar) and n-octane as a nonpolar solvent. The comparison between theory and experiments shows the presence of oscillatory and monotonically decaying terms. The periodicity of the oscillation arises from entropic effects associated with the molecular packing of the liquid, while its amplitude carries information on the solid surface (substrate and tip)–liquid interactions. The exponent of the monotonic term comes from cohesive interactions between the liquid molecules, while its amplitude reflects the interactions with the solid surfaces.

中文翻译：

三维原子力显微镜中的亚纳米界面力：云母表面附近的水和辛烷

三维力显微镜可生成固-液界面的原子分辨3D图像。在这里，我们通过比较密度泛函理论和实验研究了尖端在云母-液体界面上施加的界面力的分量。该研究涉及两种液体：KCl（极性）水溶液和n-辛烷作为非极性溶剂。理论与实验之间的比较表明存在振荡和单调衰减项。振荡的周期性来自与液体分子堆积相关的熵效应，而其振幅则在固体表面（基质和尖端）-液体相互作用中传递信息。单调项的指数来自液体分子之间的内聚相互作用，而其幅度反映了与固体表面的相互作用。

更新日期：2020-12-03

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