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How confined lubricants diffuse during shear.

Ashis Mukhopadhyay1, Sung Chul Bae, Jiang Zhao

  • 1Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801, USA.

Physical Review Letters
|December 17, 2004
PubMed
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Shear flow in thin films of octamethylcyclotetrasiloxane (OMCTS) did not induce a melting transition. Instead, molecular diffusion accelerated, indicating altered fluid dynamics under shear.

Area of Science:

  • Fluid dynamics
  • Materials science
  • Physical chemistry

Background:

  • Understanding molecular behavior in confined geometries is crucial for materials science.
  • Thin films exhibit unique properties distinct from bulk fluids.
  • The effect of shear on molecular ordering in confined liquids remains an active area of research.

Purpose of the Study:

  • To investigate the translational diffusion of a fluorescent dye in a molecularly thin film of octamethylcyclotetrasiloxane (OMCTS).
  • To compare the fluid dynamics at rest versus during shear flow.
  • To test the hypothesis that shear induces a melting transition in confined fluids.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) to probe molecular motion.
  • Confined the OMCTS fluid to a thickness of 3-4 layers between muscovite mica surfaces.

Related Experiment Videos

  • Applied shear flow to the confined fluid and measured diffusion dynamics.

    • Main Results:

    • Fluorescence correlation spectroscopy revealed accelerated diffusion timescales during shear flow compared to rest.
    • Diffusion was faster by a factor of 2 to 5 under shear.
    • The observed dynamics did not support a shear-induced melting transition.

    Conclusions:

    • Shear flow in molecularly thin OMCTS films alters fluid dynamics by increasing molecular diffusion.
    • The hypothesis of shear-induced melting in this confined system is not supported by the experimental evidence.
    • Fluorescence correlation spectroscopy serves as a sensitive probe for molecular ordering and dynamics in thin films.