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10:28
Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
How intermolecular charge transfer influences the air-water interface.
Collin D Wick1, Alexis J Lee, Steven W Rick
1Louisiana Tech University, Ruston, Louisina 71270, USA.
The Journal of Chemical Physics
|October 23, 2012
Summary
Molecular dynamics simulations explored water models with charge transfer, finding modest effects on interfacial properties but a small negative charge buildup at the air-water interface.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Materials Science
Background:
- Interfacial properties of water are crucial for various chemical and physical processes.
- Modeling intermolecular charge rearrangement in water is essential for accurate simulations.
- Existing water models may not fully capture charge transfer effects at interfaces.
Purpose of the Study:
- To investigate the impact of intermolecular charge transfer on the interfacial properties of water.
- To evaluate three distinct water models, including a new flexible and polarizable model.
- To compare simulation results with experimental data regarding interfacial charge buildup.
Main Methods:
- Utilized molecular dynamics simulations to analyze water models.
- Examined the TIP4P and TIP4P-FQ water models with modifications for charge transfer.
- Developed and simulated a novel flexible and polarizable water model incorporating intermolecular charge transfer.
Main Results:
- Intermolecular charge transfer had a modest influence on surface tension, electrostatic potential, interfacial dipole, and structure.
- A notable finding was the accumulation of a negative charge at the air-water interface.
- The simulated negative charge buildup was significantly smaller than experimentally observed values.
Conclusions:
- Water models allowing intermolecular charge rearrangement provide valuable insights into interfacial phenomena.
- While charge transfer effects are generally modest, they influence interfacial charge distribution.
- Further refinement of water models is needed to accurately replicate experimental charge buildup at interfaces.
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