Nanocapillarity and Liquid Bridge-Mediated Force between Colloidal Nanoparticles,ACS Omega

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Nanocapillarity and Liquid Bridge-Mediated Force between Colloidal Nanoparticles
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acsomega.7b01650
Luis G MacDowell ₁ , Pablo Llombart ₁ , Jorge Benet ₁ , Jose G Palanco ₂ , Andrés Guerrero-Martinez ₁

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In this work, we probe the concept of interface tension for ultrathin adsorbed liquid films on the nanoscale by studying the surface fluctuations of films down to the monolayer. Our results show that the spectrum of film height fluctuations of a liquid–vapor surface may be extended to ultrathin films provided we take into account the interactions of the substrate with the surface. Global fluctuations of the film height are described in terms of disjoining pressure, whereas surface deformations that are proportional to the interface area are accounted for by a film thickness-dependent surface tension. As a proof of concept, we model the capillary forces between colloidal nanoparticles held together by liquid bridges. Our results indicate that the classical equations for capillarity follow very precisely down to the nanoscale provided we account for the film height dependence of the surface tension.

中文翻译：

胶体纳米粒子之间的纳米毛细作用和液桥介导的力

在这项工作中，我们通过研究单层薄膜的表面波动，探讨了纳米级超薄吸附液膜界面张力的概念。我们的结果表明，如果我们考虑到基底与表面的相互作用，液-气表面的膜高度波动谱可以扩展到超薄膜。薄膜高度的整体波动用分离压力来描述，而与界面面积成比例的表面变形则由薄膜厚度相关的表面张力来解释。作为概念证明，我们模拟了通过液桥结合在一起的胶体纳米颗粒之间的毛细管力。我们的结果表明，只要我们考虑了表面张力对薄膜高度的依赖性，毛细管现象的经典方程就可以非常精确地遵循到纳米尺度。

更新日期：2018-01-05

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