Related Experiment Video
Updated: Apr 5, 2026

AC Electrokinetic Phenomena Generated by Microelectrode Structures
Published on: July 28, 2008
Electrochemical Surface Potential Due to Classical Point Charge Models Drives Anion Adsorption to the Air-Water
Marcel D Baer1, Abraham C Stern2, Yan Levin3
1†Chemical and Materials Science Division, Pacific Northwest National Laboratory, Richland 99352, Washington.
Abstract:
We demonstrate that the driving forces for ion adsorption to the air-water interface for point charge models result from both cavitation and a term that is of the form of a negative electrochemical surface potential. We carefully characterize the role of the free energy due to the electrochemical surface potential computed from simple empirical models and its role in ionic adsorption within the context of dielectric continuum theory. Our research suggests that the electrochemical surface potential due to point charge models provides anions with a significant driving force for adsoprtion to the air-water interface. This is contrary to the results of ab initio simulations that indicate that the average electrostatic surface potential should favor the desorption of anions at the air-water interface. The results have profound implications for the studies of ionic distributions in the vicinity of hydrophobic surfaces and proteins.
More Related Videos
Related Concept Videos
The Electrical Double Layer
Processes at Electrodes
Intermolecular Forces
Electrochemical Systems
Aqueous Solutions and Heats of Hydration
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Interfacial Electrochemical Methods: Overview

