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Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
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Metastable Clusters and Competitive Solvation Tune Ion Pairing at Liquid Interfaces
Pan Sun1, Robert L Sacci1, Uvinduni I Premadasa1
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.
Journal of the American Chemical Society
|August 12, 2025
Summary
A nonpolar phase can solvate amphiphilic molecules at oil/water interfaces, creating a corrugated boundary. This alters water
Area of Science:
- Physical Chemistry
- Surface Science
- Chemical Physics
Background:
- Hydrophobic and hydrophilic interactions govern complex chemical systems.
- Understanding interfacial phenomena is crucial for multicomponent systems.
Purpose of the Study:
- To investigate the role of a nonpolar phase in solvating amphiphilic molecules at oil/aqueous interfaces.
- To explore how this solvation affects interfacial properties and molecular interactions.
Main Methods:
- Surface-specific nonlinear spectroscopy to probe interfacial solvation.
- Computational simulations to model molecular behavior and interactions.
- Analysis of hydrogen bonding networks and ionic descriptors.
Main Results:
- A nonpolar phase competitively solvates amphiphiles at the oil/aqueous interface.
- This creates a corrugated phase boundary with metastable assemblies.
- Altered water hydrogen bonding and ionic 'hard/soft' descriptors were observed.
- Enhanced amphiphile mobility and transient interactions with aqueous ions occurred.
Conclusions:
- Nonpolar interactions feedback onto aqueous phase chemistry, influencing phase separation and self-assembly.
- Competitive solvation at interfaces offers a pathway to tune chemical and biological systems.
- Transient species formed at interfaces may play a role in ionic transport and function.
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