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Related Experiment Videos

Diffusion kinetics for methanol in polycrystalline ice.

Patrick Marchand1, Samuel Riou, Patrick Ayotte

  • 1Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, Québec J1K 2R1, Canada.

The Journal of Physical Chemistry. A
|October 13, 2006
PubMed
Summary
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Methanol diffusion in ice is slower than previously thought, with kinetics depending strongly on concentration. This research clarifies transport properties in icy films, crucial for understanding interstellar ice.

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Materials Science

Background:

  • Methanol (CH3OH) diffusion in water ice (H2O) is critical for astrochemical models.
  • Previous studies reported faster transport kinetics than observed here.
  • Understanding ice sublimation and diffusion is key to interpreting experimental data.

Purpose of the Study:

  • To quantitatively analyze isothermal desorption kinetics of methanol-doped H2O films.
  • To determine methanol diffusion coefficients in polycrystalline ice films.
  • To investigate the concentration dependence of methanol diffusion in ice.

Main Methods:

  • Quantitative analysis of isothermal desorption kinetics.
  • Depth profiling using concentration depth profiles.

Related Experiment Videos

  • Inhibition of ice sublimation to extract transport properties.
  • Thermal annealing of binary ice films.

    • Main Results:

    • Methanol transport in polycrystalline ice is significantly slower than previously reported.
    • Methanol exhibits first-order desorption kinetics below 0.1 mole fraction.
    • Heterodiffusion coefficients for methanol in cubic ice (Ic) were determined between 145-195 K.
    • A strong concentration dependence of methanol diffusion kinetics was observed.

    Conclusions:

    • The study provides new insights into methanol diffusion kinetics in ice, revealing slower transport and strong concentration dependence.
    • Discrepancies in literature values for ice transport properties may stem from concentration effects and sample microstructure.
    • The findings refine our understanding of molecular diffusion in icy matrices relevant to various scientific fields.