Second Harmonic Generation Study of Malachite Green Adsorption at the Interface between Air and an Electrolyte Solution: Observing the Effect of Excess Electrical Charge Density at the Interface

Understanding the differential adsorption of ions at the interface of an electrolyte solution is very important because it is closely related, not only to the fundamental aspects of biological systems, but also to many industrial applications. We have measured the excess interfacial negative charge...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2010-03, Vol.114 (9), p.3236-3241
Main Authors: Song, Jinsuk, Kim, Mahn Won
Format: Article
Language:English
Subjects:
Adsorption
Air
B: Statistical Mechanics, Thermodynamics, Medium Effects
Electrolytes - chemistry
Rosaniline Dyes - chemistry
Static Electricity
Surface Properties
Thermodynamics
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Summary:Understanding the differential adsorption of ions at the interface of an electrolyte solution is very important because it is closely related, not only to the fundamental aspects of biological systems, but also to many industrial applications. We have measured the excess interfacial negative charge density at air−electrolyte solution interfaces by using resonant second harmonic generation of oppositely charged probe molecules. The excess charge density increased with the square root of the bulk electrolyte concentration. A new adsorption model that includes the electrostatic interaction between adsorbed molecules is proposed to explain the measured adsorption isotherm, and it is in good agreement with the experimental results.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp9104882