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Direct measurement of surface forces: Recent advances and insights
Applied Physics Reviews ( IF 15.0 ) Pub Date : 2021-09-22 , DOI: 10.1063/5.0059893
Weifeng Lin 1 , Jacob Klein 1
Affiliation  

The direct measurement of forces between atomically smooth mica surfaces down to sub-nanometer separation was pioneered over 50 years ago and has yielded deep understanding of a range of interfacial effects, not least the forces that determine colloidal stability and self-assembly, the properties of highly confined fluids, and the molecular origin of friction and lubrication. Here, we describe recent advances, including the use of substrates other than mica, probing the shear properties of highly confined fluids including hydration layers, and the modulation of surface forces by surface-attached macromolecules and amphiphiles, together with microscopic imaging of the surface morphology. These advances enabled novel features such as external potential control of the interacting surfaces, new understanding of lubrication in aqueous and biological systems, the design of novel nanoparticles and surface assemblies for modulating frictional dissipation, and insight into the nature of long-ranged attraction between surfactant-hydrophobized surfaces. We conclude by briefly outlining future challenges and opportunities provided by such direct surface forces studies.

中文翻译:

表面力的直接测量:最新进展和见解

50 多年前率先对原子级光滑云母表面之间的力进行直接测量,直至亚纳米级分离,并且已经深入了解了一系列界面效应,尤其是决定胶体稳定性和自组装的力,以及高度受限的流体,以及摩擦和润滑的分子起源。在这里,我们描述了最近的进展,包括使用除云母以外的基材,探索高度封闭流体(包括水合层)的剪切特性,以及通过表面附着的大分子和两亲物对表面力的调节,以及表面形态的显微成像. 这些进步实现了新的特征,例如相互作用表面的外部电位控制,对水性和生物系统润滑的新理解,用于调节摩擦耗散的新型纳米粒子和表面组件的设计,以及对表面活性剂疏水化表面之间长程吸引力的性质的深入了解。最后,我们简要概述了此类直接表面力研究提供的未来挑战和机遇。
更新日期:2021-09-30
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