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Shear forces in molecularly thin films.

M Schoen, C L Rhykerd, D J Diestler

    Science (New York, N.Y.)
    |September 15, 1989
    PubMed
    Summary
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    Simulations reveal that atomic fluids under shear between solid surfaces can form a solid layer. A critical stress is needed to initiate sliding, causing the solid layer to fluidize.

    Area of Science:

    • Materials Science
    • Computational Physics
    • Surface Science

    Background:

    • Understanding tribological behavior at the nanoscale is crucial for designing advanced materials and devices.
    • Atomic interactions at solid-fluid interfaces govern friction and lubrication phenomena.

    Purpose of the Study:

    • To investigate the shearing behavior of atomic fluids confined between solid surfaces.
    • To determine the conditions under which a solid layer forms and the stress required for sliding.

    Main Methods:

    • Utilizing Monte Carlo and molecular dynamics simulations.
    • Modeling atomic fluid confined between face-centered cubic (100) structured surfaces.

    Main Results:

    • An epitaxially distorted solid phase can form between surfaces separated by 1-5 atomic diameters.

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  • A critical shear stress is required to initiate sliding of the surfaces.
  • Sliding leads to the expulsion of a solid layer, with remaining layers becoming fluid.

    • Conclusions:

    • The formation and subsequent fluidization of an interfacial solid layer are key mechanisms in the shearing of confined atomic fluids.
    • Critical stress phenomena are essential for understanding nanoscale friction and lubrication.