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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Molecular liquid under nanometre confinement: density profiles underlying oscillatory forces.

Edith Perret1, Kim Nygård, Dillip K Satapathy

  • 1Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 12, 2011
PubMed
Summary

Ultrathin films of tetrakis(trimethyl)siloxysilane (TTMSS) exhibit discrete thickness transitions under pressure. X-ray reflectivity reveals layer spacing larger than molecular size, challenging simple layering models.

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Area of Science:

  • Materials Science
  • Surface Science
  • Physical Chemistry

Background:

  • Ultrathin films exhibit unique properties when confined between surfaces.
  • Liquid behavior under confinement is crucial for understanding lubrication and nanotechnology.
  • Previous studies suggested strong molecular layering based on discrete thickness transitions.

Purpose of the Study:

  • To investigate the molecular behavior of ultrathin tetrakis(trimethyl)siloxysilane (TTMSS) films confined by mica.
  • To reconcile the observed discrete film thickness transitions with molecular dimensions and layering.
  • To determine the actual layer spacing and density profiles within confined TTMSS films.

Main Methods:

  • Confining ultrathin TTMSS films (<12 nm) between atomically flat mica membranes.
  • Applying normal forces to induce discrete film thickness transitions.
  • Measuring transition step sizes using optical interferometry.
  • Determining liquid density profiles and layer spacing using X-ray reflectivity (XRR).

Main Results:

  • Discrete film thickness transitions were observed, involving molecule expulsion.
  • Measured transition step sizes (7.5-8.4 Å) were smaller than the TTMSS molecular diameter (9.0 Å).
  • XRR revealed an average layer spacing (10-11 Å) significantly larger than the transition step size and molecular diameter.
  • A distinct boundary layer with different electron density and periodicity was identified.

Conclusions:

  • The observed discrete layering transitions do not directly reflect molecular spacing.
  • Layer spacing in confined TTMSS films is larger than predicted by simple layering models.
  • The presence of a distinct boundary layer influences the film's structure and behavior.