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Related Experiment Videos

Confinement-induced ordering of alkanes between an elastomer and a solid surface.

Kumar Nanjundiah1, Ali Dhinojwala

  • 1Department of Polymer Science, The University of Akron, Akron, Ohio 44325, USA.

Physical Review Letters
|October 26, 2005
PubMed
Summary

Confined liquid alkanes show increased molecular order. Below freezing, they crystallize differently than in bulk, with molecules aligning parallel to the surface normal.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Surface Science

Background:

  • Understanding molecular behavior in confined environments is crucial for materials design.
  • Liquid alkanes exhibit complex structures influenced by interfaces.

Purpose of the Study:

  • To investigate the molecular structure and ordering of liquid alkanes confined between a poly(dimethyl siloxane) lens and a sapphire substrate.
  • To characterize the crystallization behavior of confined alkanes.

Main Methods:

  • Utilized surface-sensitive infrared-visible sum frequency generation (SFG) spectroscopy.
  • Employed a flexible poly(dimethyl siloxane) lens and a rigid sapphire substrate for confinement.

Main Results:

  • Observed a reduction in gauche defects, indicating enhanced molecular ordering of alkanes under confinement.

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  • Found that cooling below the freezing point results in crystallization with a unique molecular orientation (symmetry axis parallel to surface normal).
  • This confined crystal structure differs significantly from bulk alkane crystals.

    • Conclusions:

    • Confinement induces significant molecular ordering in liquid alkanes.
    • The crystallization pathway and resulting structure of alkanes are highly dependent on the confining geometry and interfaces.
    • This study provides insights into interfacial phenomena and crystal growth in confined systems.