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Disjoining pressure of thin nonfreezing interlayers.

N V Churaev1, V D Sobolev, V M Starov

  • 1Moscow Institute of Physical Chemistry, Russian Academy of Sciences, Leninsky Prospekt 31, Moscow, 119991, Russia.

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

At subzero temperatures, nonfreezing water interlayers form in quartz capillaries. Structural changes in this water cause disjoining pressure, explaining the interlayer phenomenon.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Geophysics

Background:

  • Water exhibits unique properties at subzero temperatures.
  • Confined water in nanoporous materials can remain liquid below 0°C.
  • Understanding these nonfreezing water layers is crucial for various scientific fields.

Purpose of the Study:

  • To investigate the formation and properties of nonfreezing water interlayers in quartz capillaries.
  • To measure the thickness of these interlayers under varying temperatures and pressures.
  • To determine the forces governing the behavior of nonfreezing water.

Main Methods:

  • Utilized dilatometry to measure interlayer thicknesses.
  • Conducted experiments over a temperature range of -1 to -0.14 °C.

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  • Applied pressures up to 8 MPa to study confinement effects.

    • Main Results:

    • Nonfreezing water interlayers were observed between quartz surfaces and ice.
    • Interlayer thicknesses were measured and correlated with temperature and pressure.
    • Disjoining pressure isotherms were calculated from the experimental data.

    Conclusions:

    • Structural forces, arising from changes in nonfreezing water structure, are the primary drivers of disjoining pressure.
    • These structural changes are fundamental to the existence of nonfreezing water interlayers.
    • The study elucidates the behavior of confined water at the nanoscale.