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Boundary slip moderated by interfacial hydrogen bond dynamics

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Abstract

Understanding the slip behaviors on the graphene surfaces is crucial in the field of nanofluidics and nanofluids. The reported values of the slip length in the literature from both experimental measurements and simulations are quite scattered. The presence of low concentrations of functional groups may have a greater impact on the flow behavior than expected. Using non-equilibrium molecular dynamics simulations, we specifically investigated the influence of hydroxyl-functionalized graphene surfaces on the boundary slip, particularly the effects related to hydrogen bond dynamics. We observed that hydroxyl groups significantly hindered the sliding motion of neighboring water molecules. Hydrogen bonds can be found between hydroxyl groups and water molecules. During the flow process, these hydrogen bonds continuously form and break, resulting in the energy dissipation. We analyzed the energy balance under different driving forces and proposed a theoretical model to describe the slip length which also considers the influence of hydrogen bond dynamics. The effects of the driving force and the surface functional group concentration were also studied.

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Data sets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (12241203, U22B2075) and the Youth Innovation Promotion Association CAS (2020449). The numerical calculations were performed on the supercomputing system in Hefei Advanced Computing Center and the Supercomputing Center of University of Science and Technology of China.

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JCL prepared Figs. 1, 2, 3, 5, 6, 7, 8, 9, 10, and 11. KLZ prepared Fig. 4. JCL and FCW wrote the main manuscript text and all authors reviewed the manuscript.

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Correspondence to HengAn Wu or FengChao Wang.

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Li, J., Zhang, K., Fan, J. et al. Boundary slip moderated by interfacial hydrogen bond dynamics. Microfluid Nanofluid 27, 86 (2023). https://doi.org/10.1007/s10404-023-02695-8

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  • DOI: https://doi.org/10.1007/s10404-023-02695-8

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