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Updated: Jun 6, 2025
08:01
A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
Published on: August 18, 2022
3.0K
Intact water adsorption on Co(0001) at 100 K: transition from ordered bilayer to amorphous ice structures
Ping Yi1, Yalong Jiang1, Yitian Cao1
1School of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China. phymaohy@hznu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|November 29, 2024
Summary
Deuterium oxide (D2O) forms ordered hexamer islands on cobalt (Co) surfaces, creating mixed hydrophilic and hydrophobic regions. Further adsorption leads to disordered and amorphous ice structures, impacting surface properties.
Area of Science:
- Surface Science
- Physical Chemistry
- Materials Science
Background:
- Cobalt (Co) is a key catalyst in reactions like Fischer-Tropsch synthesis.
- Understanding water molecule adsorption on cobalt surfaces is crucial but understudied.
- Surface interactions dictate catalytic activity and material properties.
Purpose of the Study:
- To investigate the adsorption behavior of water molecules on the Co(0001) surface.
- To elucidate the structural arrangements and intermolecular interactions of water adlayers.
- To characterize the evolution of water structures with increasing coverage.
Main Methods:
- Infrared reflection adsorption spectroscopy (IRAS) for vibrational analysis.
- Low-energy electron diffraction (LEED) for structural determination.
- Experiments conducted on Co(0001) single crystal surfaces at 100 K.
Main Results:
- D2O adsorbs intact, forming hexamer islands with coexisting D-up and D-down geometries on Co(0001).
- A partially ordered (√3 × √3)R30° bilayer structure emerges with a 2:3 ratio of D-up:D-down domains.
- Adsorption leads to mixed hydrophilic/hydrophobic surface regions, followed by disordered and amorphous ice formation at higher coverages.
Conclusions:
- The study provides the first experimental evidence of ordered water structures on cobalt surfaces.
- Water adsorption on Co(0001) proceeds through distinct structural phases, from ordered islands to amorphous ice.
- The findings offer insights into surface wetting phenomena and the initial stages of ice formation on metal catalysts.
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