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Updated: Sep 26, 2025
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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
Published on: August 18, 2022
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Acetone-Water Interactions in Crystalline and Amorphous Ice Environments
Michelle R Brann1, Stephen P Hansknecht1, Mark Muir1
1The James Franck Institute and Department of Chemistry, The University of Chicago, 929 East 57th Street, Chicago, Illinois 60637, United States.
The Journal of Physical Chemistry. A
|April 22, 2022
Summary
Acetone forms stronger hydrogen bonds with porous D2O ice than nonporous ice. This interaction is limited in porous ice due to pore blockage and low-temperature diffusion, impacting astrophysical models.
Area of Science:
- Astrochemistry
- Surface Science
- Spectroscopy
Background:
- Acetone is a common organic molecule found in astrophysical environments.
- Water ice, particularly D2O ice, serves as a crucial substrate for molecule interactions in space.
- Understanding these interactions is key to modeling chemical processes on icy dust grains.
Purpose of the Study:
- To systematically investigate the interaction between acetone and various D2O ice structures.
- To quantify the extent of hydrogen bonding between acetone and different ice morphologies.
- To elucidate the influence of ice porosity on acetone-ice interactions.
Main Methods:
- Time-resolved, in situ reflection absorption infrared spectroscopy (RAIRS) was employed.
- Acetone was deposited onto different D2O ice films: nonporous amorphous (np-ASW), crystalline (CI), and porous amorphous (p-ASW).
- RAIR spectra were analyzed to track changes in chemical bonds and hydrogen bonding.
Main Results:
- Acetone exhibited stronger hydrogen bonding with porous D2O ices compared to nonporous or crystalline ices.
- Hydrogen bonding was quantified by spectral shifts in the C=O region and reduction in dangling bond area.
- Increased porosity (70° vs 30° deposition) led to reduced hydrogen bonding, suggesting pore blockage and limited diffusion.
Conclusions:
- The porosity of D2O ice significantly influences acetone's hydrogen bonding behavior.
- Pore accessibility and diffusion limitations at low temperatures restrict acetone-ice interactions in porous structures.
- These findings provide quantitative insights crucial for accurate modeling of organic molecule interactions on astrophysical icy surfaces.
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