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Updated: Mar 26, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
Unveiling Microscopic Structures of Charged Water Interfaces by Surface-Specific Vibrational Spectroscopy
Yu-Chieh Wen1,2,3, Shuai Zha1, Xing Liu4,5
1Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, People's Republic of China.
A new spectroscopy method measures water at charged interfaces. It reveals how water structure changes with lipid charge and ion interactions, advancing understanding of electrochemical and biological systems.
Area of Science:
- Physical Chemistry
- Surface Science
- Spectroscopy
Background:
- Understanding molecular interactions at charged interfaces is crucial for electrochemistry and biology.
- Existing methods have limitations in probing interfacial water structure with molecular specificity.
Purpose of the Study:
- To develop a novel sum-frequency spectroscopy (SFS) scheme for measuring vibrational spectra of interfacial molecular structures.
- To investigate the interfacial water structure at a charged lipid-aqueous interface.
Main Methods:
- Development of a specialized sum-frequency spectroscopy (SFS) technique.
- Application of SFS to a prototype lipid-aqueous interface model system.
Main Results:
- The SFS scheme successfully measured vibrational spectra of the interfacial water.
- An interfacial hydrogen-bonded water layer structure was identified.
- This water structure demonstrated sensitivity to the lipid headgroup's charge state and specific ion interactions.
Conclusions:
- The novel SFS technique offers a powerful tool for molecular-level analysis of charged aqueous interfaces.
- Provides new insights into the behavior of water at electrochemical and biological interfaces.
- Enables deeper understanding of interfacial phenomena relevant to various scientific disciplines.
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