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Energy stored in nanoscale water capillary bridges formed between chemically heterogeneous surfaces with circular patches

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Chinese Physics B 2020年第11期29卷 44-51页

作者： Bin-Ze Tang Xue-Jia Yu Sergey V.Buldyrev nicolas giovambattista Li-Mei Xu International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Department of Physics Yeshiva University500 West 185th StreetNew YorkNY 10033United States Department of Physics Brooklyn College of the City University of New YorkBrooklynNew York 11210United States Ph.D.Programs in Chemistry and Physics The Graduate Center of the City University of New YorkNew YorkNY 10016United States Collaborative Innovation Center of Quantum Matter Beijing 100871China

The formation of nanoscale water capillary bridges(WCBs) between chemically heterogeneous(patchy) surfaces plays an important role in different scientific and engineering applications, including nanolithography, colloidal aggregation, and bioinspired adhesion. However, the properties of WCB of nanoscale dimensions remain unclear. Using molecular dynamics simulations, we investigate the geometrical and thermodynamic properties of WCB confined between chemically heterogeneous surfaces composed of circular hydrophilic patches on a hydrophobic background. We find that macroscopic capillary theory provides a good description of the WCB geometry and forces induced by the WCB on the confining surfaces even in the case of surface patches with diameters of only 4 nm. Upon stretching, the WCB contact angle changes from hydrophobic-like values(θ > 90°) to hydrophilic-like values(θ < 90°) until it finally breaks down into two droplets at wall separations of ~9–10 nm. We also show that the studied nanoscale WCB can be used to store relevant amounts of energy EPand explore how the walls patch geometry can be improved in order to maximize EP. Our findings show that nanoscale WCB can, in principle, be exploited for the design of clean energy storage devices as well as actuators that respond to changes in relative humidity. The present results can also be of crucial importance for the understanding of water transport in nanoporous media and nanoscale engineering systems.

关键词： water capillary bridge energy density morphology transition hydrophilicity

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