Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water
Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water
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DOI：
10.1063/1.5037992
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发表时间：
2018-08-20
影响因子：
4
通讯作者：
Peeters, F. M.
中科院分区：
文献类型：
--
作者：
Neek-Amal, M.;Lohrasebi, A.;Peeters, F. M.
纳米毛细管内的水变得有序，导致非常规行为。已经观察到由石墨烯制成的纳米薄毛细管内的水流显着增强[Radha et al., Nature (London) 538, 222 (2016)]。在这里，我们将这种增强解释为由于石墨烯纳米毛细管内水的大密度和异常粘度。利用具有滑移边界条件的哈根-泊肃叶理论，并结合分离压力项和分子动力学模拟的结果，我们提出了一种分析理论，阐明了疏水性纳米毛细管内水流增强的根源。我们的工作揭示了纳米毛细管中的水流对纳米约束水的结构特性的独特依赖性，这与实验一致，这开辟了纳米流体学的新途径。由 AIP 出版社出版。
Water inside a nanocapillary becomes ordered, resulting in unconventional behavior. A profound enhancement of water flow inside nanometer thin capillaries made of graphene has been observed [Radha et al., Nature (London) 538, 222 (2016)]. Here, we explain this enhancement as due to the large density and the extraordinary viscosity of water inside the graphene nanocapillaries. Using the Hagen-Poiseuille theory with slippage-boundary condition and incorporating disjoining pressure term in combination with results from molecular dynamics simulations, we present an analytical theory that elucidates the origin of the enhancement of water flow inside hydrophobic nanocapillaries. Our work reveals a distinctive dependence of water flow in a nanocapillary on the structural properties of nanoconfined water in agreement with experiment, which opens a new avenue in nanofluidics. Published by AIP Publishing.