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A Molecular Dynamics Study on Wetting Phenomena at a Solid Surface with a Nanometer-Scale Slit Pore.

Kunio Fujiwara, Masahiko Shibahara

    Journal of Nanoscience and Nanotechnology
    |September 11, 2015
    PubMed
    Summary

    Molecular dynamics simulations reveal that liquid wetting occurs when fluid molecules inside a nanometer-scale slit pore have lower energy than the bulk liquid. This explains fundamental wetting mechanisms at the nanoscale.

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    Area of Science:

    • * Computational physics and physical chemistry.
    • * Nanoscale fluid dynamics and surface science.

    Background:

    • * Understanding liquid wetting on solid surfaces is crucial for various applications, including microfluidics and materials science.
    • * The behavior of liquids within nanometer-scale pores presents unique challenges due to surface effects.

    Purpose of the Study:

    • * To investigate the fundamental molecular mechanisms of liquid wetting phenomena on solid surfaces with nanometer-scale slit pores.
    • * To elucidate the role of molecular energy in initiating and sustaining wetting within confined geometries.

    Main Methods:

    • * Non-equilibrium molecular dynamics (MD) simulations were employed.
    • * The 12-6 Lennard-Jones (LJ) potential model was used for all molecular interactions.
    • * Lorentz-Berthelot combining rules and adjustable relative parameters controlled fluid-solid interactions.

    Main Results:

    • * Wetting phenomena were observed to occur when the total energy per unit volume of fluid molecules near the solid surface inside the slit pore decreased.
    • * This energy reduction was significant compared to the bulk liquid membrane outside the pore.
    • * The molecular energy landscape near the pore entrance dictates wetting behavior.

    Conclusions:

    • * Liquid wetting in nanometer-scale slit pores is driven by a reduction in molecular energy within the confined space.
    • * The findings provide a molecular-level understanding of wetting phenomena, essential for designing nanoscale devices and processes.