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Related Experiment Videos

Ice premelting during differential scanning calorimetry.

P W Wilson1, J W Arthur, A D Haymet

  • 1Physiology Department, School of Medical Sciences, University of Otago, Dunedin, New Zealand.

Biophysical Journal
|November 5, 1999
PubMed
Summary

Surface melting of ice in differential scanning calorimetry (DSC) pans occurs only a few degrees below the melting point due to curvature effects, not short-range forces. Warming rate can also affect DSC baseline readings.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Thermodynamics

Background:

  • Premelting of ice surfaces is influenced by temperature, curvature, and solutes.
  • Previous studies suggested premelting at -50°C in DSC pans, attributed to short-range forces.
  • Understanding ice premelting is crucial for applications involving sub-freezing temperatures.

Purpose of the Study:

  • To investigate the phenomenon of ice premelting in differential scanning calorimetry (DSC) pans.
  • To determine the actual driving forces and temperatures for premelting in pure water ice.
  • To clarify potential misinterpretations of DSC data related to ice phase transitions.

Main Methods:

  • Experimental analysis of polycrystalline ice samples in DSC pans.
  • Theoretical evaluation of thermodynamic driving forces for premelting.

Related Experiment Videos

  • Investigation of the influence of warming rate on DSC baseline.

    • Main Results:

    • No evidence supports premelting at -50°C in DSC pans due to short-range forces.
    • Curvature effects in DSC pans cause premelting typically a few degrees below the equilibrium melting point for pure water.
    • Warming rate significantly impacts the DSC baseline slope, potentially mimicking endothermic events.

    Conclusions:

    • The reported extreme premelting behavior of ice in DSC pans is not supported by thermodynamic principles.
    • Curvature effects are the primary factor governing premelting in pure water ice within DSC pans.
    • DSC operators using water as a standard should consider warming rate effects and curvature contributions in sub-freezing analyses.