Liquid water can slip on a hydrophilic surface.
TLDR
Simulation results demonstrate that hydrophilic surfaces can show features typically associated with hydrophobicity, namely liquid water slip, and this dichotomy might be purely coincidental.Abstract:
Understanding and predicting the behavior of water, especially in contact with various surfaces, is a scientific challenge. Molecular-level understanding of hydrophobic effects and their macroscopic consequences, in particular, is critical to many applications. Macroscopically, a surface is classified as hydrophilic or hydrophobic depending on the contact angle formed by a water droplet. Because hydrophobic surfaces tend to cause water slip whereas hydrophilic ones do not, the former surfaces can yield self-cleaning garments and ice-repellent materials whereas the latter cannot. The results presented herein suggest that this dichotomy might be purely coincidental. Our simulation results demonstrate that hydrophilic surfaces can show features typically associated with hydrophobicity, namely liquid water slip. Further analysis provides details on the molecular mechanism responsible for this surprising result.read more
Citations
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Fast parallel algorithms for short-range molecular dynamics
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Wettability effect on nanoconfined water flow
TL;DR: A simple model is proposed based on the concept of effective slip, which is a linear sum of true slip, depending on a contact angle, and apparent slip, caused by a spatial variation of the confined water viscosity as a function of wettability as well as the nanopore dimension, which shows that the flow capacity of confined water is 10−1∼107 times that calculated by the no-slip Hagen–Poiseuille equation.
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Friction of water on graphene and hexagonal boron nitride from ab initio methods: very different slippage despite very similar interface structures.
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Friction of Water on Graphene and Hexagonal Boron Nitride from ab initio Methods: Very Different Slippage Despite Very Similar Interface Structures
TL;DR: It is shown for the first time that ab initio molecular dynamics can be used to unravel the connection between the structure of nanoscale water and friction for liquid water in contact with graphene and with hexagonal boron nitride.
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Nanoconfinement-Mediated Water Treatment: From Fundamental to Application.
TL;DR: This perspective review will briefly summarize the current state-of-the-art of the nanomaterials as well as the nanoconfined analogues developed for water treatment, and put emphasis on the effects of nanoconfinement from three aspects, i.e., on the structure and behavior of water molecules, on the formation (e.g., crystallization) of confined nanommaterials, and on the nano-enabled chemical reactions.
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