On the Origin of Water Flow through Carbon Nanotubes

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Jiaye Su, Keda Yang

Abstract

The transport of water molecules through carbon nanotubes (CNTs) is of primary importance for understanding water-mediated biological activities as well as for the design of novel nanoporous materials. Herein, we analyze the water flow through CNTs by using molecular dynamics simulations with the hope of finding basic parameters determining the flow value. Of particular interest is that a simple equation as a function of water diffusion, occupancy and CNT size, can well describe the water flow through CNTs with different sizes. Specifically, both the simulation and equation flow exhibit power law relations with the CNT diameter and length, where the two exponents are close to each other. The water occupancy and translocation time also demonstrate interesting relations with the CNT size. The water dipole orientations and density profiles are also sensitive to the change of CNT size. These results greatly enhance our knowledge on the nature of water flow through CNTs and are helpful in predicting the water flow of CNTs up to the experimental length scale.

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Citations

Aug 16, 2017·Physical Chemistry Chemical Physics : PCCP·Jiaye SuYue Shi
Oct 3, 2019·Physical Review. E·Leonid V Mirantsev

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