CLC number:
On-line Access: 2024-08-27
Received: 2023-10-17
Revision Accepted: 2024-05-08
Crosschecked: 2023-09-20
Cited: 0
Clicked: 1466
Citations: Bibtex RefMan EndNote GB/T7714
Shengjie WEI, Yuchao LI, Peng SHEN, Yunmin CHEN. Molecular force mechanism of hydrodynamics in clay nanopores[J]. Journal of Zhejiang University Science A, 2023, 24(9): 817-827.
@article{title="Molecular force mechanism of hydrodynamics in clay nanopores",
author="Shengjie WEI, Yuchao LI, Peng SHEN, Yunmin CHEN",
journal="Journal of Zhejiang University Science A",
volume="24",
number="9",
pages="817-827",
year="2023",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200427"
}
%0 Journal Article
%T Molecular force mechanism of hydrodynamics in clay nanopores
%A Shengjie WEI
%A Yuchao LI
%A Peng SHEN
%A Yunmin CHEN
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 9
%P 817-827
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200427
TY - JOUR
T1 - Molecular force mechanism of hydrodynamics in clay nanopores
A1 - Shengjie WEI
A1 - Yuchao LI
A1 - Peng SHEN
A1 - Yunmin CHEN
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 9
SP - 817
EP - 827
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200427
Abstract: nanopores are prevalent within various clay morphologies, and water flow in clay nanopores is significant for various engineering applications. In this study, we performed non-equilibrium molecular dynamics (NEMD) simulations to reveal the molecular force mechanisms of water flow in clay nanopores. The water dynamic viscosity, slip length, and average flow velocity were obtained to verify the NEMD models. Since the water confined in the nanopores maintained a dynamic mechanical equilibrium state, each water lamina can be regarded as a simply supported beam. The applied driving force, the force from clay crystal layers, the force from compensating sodium ions, and the force from other water laminae were further calculated to investigate the force mechanisms. The van der Waals barrier above the surface and hydraulic gradient lead to distribution differences in water oxygen atoms, which contribute to a net van der Waals resistance component of the force from clay crystal layers. Meanwhile, the water molecules tend to rotate to generate the electrostatic resistance component of the force from clay crystal layers and balance the increasing hydraulic gradient. Due to the velocity difference, the water molecules in the slower lamina have a higher tendency to lag and generate a net electrostatic resistance force as well as a net van der Waals driving force on the water molecules in the faster lamina, which together make up the viscous force.
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