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Elastocapillarity at Nano- and Micro-scales

其他書名	From Wetting and Adhesion to Interface Reinforcement
出版	University of Akron, 2017
URL	http://books.google.com.hk/books?id=8c2rswEACAAJ&hl=&source=gbs_api

註釋Elastocapillarity, the fine interplay between capillary and elastic forces, determines contact phenomena in soft matter at nano- and micro-scales. Recent studies have shown that the classical Johnson-Kendall-Roberts (JKR) model breaks down in predicting the contact configurations of nano- and micro-particles on soft gel-like surfaces. Using a combination of the molecular dynamics (MD) simulations and theoretical calculations, we confirmed the universality behind a wetting-like and adhesion-like contact between particles and substrates. We developed a unified model, in which the deformation of a particle/substrate system is governed by a dimensionless parameter, i.e., elastocapilliary number. Our model unifies two distinct particle-substrate interaction regimes: in the wetting regime corresponding to interval of system parameters for which the elastocapillary number is larger than unity, the contact is controlled by the capillary forces; while in the adhesion regime when the elastocapillary number is smaller than unity, the contact properties are determined by a balance of the elastic and adhesion forces. Our model provides an alternative approach to measure the surface tension of gels and elastomers, and the work of adhesion between rigid and soft materials. In the framework of this model, we elucidated the role of elastocapillarity in determining the interactions of elastic particles with textured surfaces, the spreading of polymeric droplets on soft surfaces, and the detachment of particles from elastic surfaces. Finally, we extended this model to establish the conditions for interface reinforcement between two soft surfaces by particles. The predictions of our model were confirmed by MD simulations showing that the work required for separation of two gels glued together by particles could be up to 10 times larger than the work of adhesion between two neat gel surfaces.