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Updated: May 18, 2026
08:01
A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
Published on: August 18, 2022
A fully size-resolved perspective on the crystallization of water clusters
Christoph C Pradzynski1, Richard M Forck, Thomas Zeuch
1Institut für Physikalische Chemie, Universität Göttingen, Tammannstr. 6, D-37077 Göttingen, Germany.
Science (New York, N.Y.)
|September 22, 2012
Summary
Researchers identified the minimum number of water molecules required for ice crystallization. This breakthrough advances understanding of water
Area of Science:
- Physical Chemistry
- Spectroscopy
- Materials Science
Background:
- Understanding water's macroscopic properties requires knowledge of hydrogen bonding in ice nucleation.
- Experimentally determining the minimum size for ice crystal formation has been difficult.
Purpose of the Study:
- To determine the smallest size of water clusters ((H2O)n) that exhibit ice crystallization.
- To investigate the transition from water clusters to crystalline ice using spectroscopy.
Main Methods:
- Infrared (IR) spectroscopy of size-selected (H2O)n clusters (n=85-475).
- Sodium doping and IR excitation-modulated photoionization spectroscopy for cluster analysis.
- Analysis of spectral features in the OH-stretching region.
Main Results:
- The onset of crystallization was observed around n = 275 ± 25 water molecules.
- At n = 475 ± 25, the characteristic crystalline ice band at 3200 cm(-1) became dominant.
- Successfully studied water clusters in the previously intractable 85-475 molecule size range.
Conclusions:
- The study provides experimental evidence for the minimum size of water clusters required for ice formation.
- The methodology enables size-resolved IR spectroscopy for neutral clusters in the 100-1000 molecule range.
- This research offers insights into the emergence of condensed phase properties in molecular clusters.
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