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Updated: May 28, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
Vibrational spectroscopy of water at interfaces
J L Skinner1, P A Pieniazek, S M Gruenbaum
1Theoretical Chemistry Institute, University of Wisconsin, Madison, 53706, United States. skinner@chem.wisc.edu
Advanced vibrational spectroscopy reveals crucial details about water's hydrogen-bonding networks at interfaces. This study models water's behavior at liquid-vapor, reverse micelle, and lipid bilayer interfaces, enhancing our understanding of this vital substance.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Computational Modeling
Background:
- Understanding liquid water at the molecular level is critical for biology and atmospheric sciences.
- Water properties differ significantly between bulk and interfacial environments, necessitating study of hydrogen-bonding networks.
- Recent advances in vibrational spectroscopy enable detailed probing of water structure and dynamics.
Purpose of the Study:
- To model and interpret experimental data for three distinct aqueous interfaces.
- To elucidate the role of molecular interactions and hydrogen bonding in interfacial water structure and dynamics.
- To advance the theoretical framework for analyzing vibrational spectroscopy of water.
Main Methods:
- Sum-frequency spectroscopy for the water liquid-vapor interface.
- Bulk spectroscopy techniques (FTIR, pump-probe, 2D IR) for water in reverse micelles and lipid bilayers.
- Theoretical modeling, including non-linear response functions, to interpret experimental spectra and dynamics.
Main Results:
- Three-body interactions are essential for modeling the water liquid-vapor interface spectrum.
- Interfacial water in reverse micelles shows weaker hydrogen bonding and slower rotational dynamics due to curvature.
- Interfacial water between lipid bilayers exhibits stronger hydrogen bonding to phosphate oxygens.
Conclusions:
- Vibrational spectroscopy and theoretical advances provide unprecedented insights into interfacial water structure and dynamics.
- The study successfully models and interprets experimental findings across diverse aqueous interfaces.
- A unified theoretical framework significantly contributes to understanding water's unique properties.
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