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Methane Hydrate Crystallization on Sessile Water Droplets
Published on: May 26, 2021
Clathrate hydrates with hydrogen-bonding guests.
Victoria Buch1, J Paul Devlin, I Abrrey Monreal
1The Fritz Haber Institute for Molecular Dynamics, The Hebrew University, Jerusalem, 91904, Israel.
Physical Chemistry Chemical Physics : PCCP
|November 6, 2009
Summary
Clathrate hydrates (CHs) with hydrogen-bonding guests form unique crystal structures at low temperatures. Their distinct properties arise from lattice defects stabilized by water-guest hydrogen bonds.
Area of Science:
- Materials Science
- Physical Chemistry
- Crystallography
Background:
- Clathrate hydrates (CHs) are crystalline inclusion compounds where water cages host guest molecules.
- Typically, CH formation requires elevated temperatures and pressures.
- This study focuses on CHs with guests capable of hydrogen bonding to water.
Purpose of the Study:
- Investigate the formation and transformation kinetics of CHs with hydrogen-bonding guests.
- Explore the unique properties of these CHs, particularly their low-temperature formation.
- Understand the role of lattice defects and hydrogen bonding in CH stability.
Main Methods:
- Experimental study of CH formation and transformation kinetics using infrared spectroscopy.
- Computational study to analyze the host lattice structure and defect properties.
- Characterization of CHs formed with hydrogen-bonding guests like H2S and ethers.
Main Results:
- CHs with hydrogen-bonding guests can form at significantly lower temperatures (100-150 K) than conventional CHs.
- These CHs exhibit unique crystal structures where water-water hydrogen bonding is absent.
- Infrared spectroscopy revealed distinct formation and transformation kinetics.
- Computational analysis indicated a high concentration of point defects in the host lattice, stabilized by guest hydrogen bonding.
Conclusions:
- The unique low-temperature formation and properties of these CHs are attributed to a high density of point defects.
- Hydrogen bonding between water and guest molecules plays a crucial role in stabilizing these defects and the overall CH structure.
- These findings offer new insights into the thermodynamics and kinetics of clathrate hydrate formation.
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