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Homogeneous ice nucleation requires significant supercooling. This study explores negative pressure effects, predicting it can trigger ice nucleation or enhance surface-induced freezing, with applications in food freezing and weather phenomena.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Physical Chemistry

Background:

  • Homogeneous ice nucleation typically requires supercooling exceeding 35 K.
  • Water's melting and freezing points decrease under positive pressure but increase under negative pressure.
  • Negative pressure, or tension, can occur transiently in water due to mechanical stress.

Purpose of the Study:

  • To extrapolate homogeneous ice nucleation temperatures to negative pressures.
  • To investigate the potential of negative pressure to induce ice nucleation.
  • To explore the combined effects of negative pressure and ice-nucleating surfaces.

Main Methods:

  • Extrapolation of existing homogeneous ice nucleation data to negative pressure regimes.
  • Thermodynamic modeling to predict nucleation behavior under tension.
  • Analysis of transient negative pressure phenomena in water.

Main Results:

  • Negative pressure can induce homogeneous ice nucleation at temperatures below approximately 262 K.
  • Above 262 K, homogeneous cavitation (bubble nucleation) dominates under negative pressure.
  • Negative pressure enhances the ice nucleation efficiency of surfaces.

Conclusions:

  • Transient negative pressure can trigger homogeneous ice nucleation without surfaces.
  • Negative pressure offers a novel mechanism to control ice formation.
  • Applications include improving frozen product quality and understanding atmospheric ice processes.