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Hofmeister effect on micellization, thin films and emulsion stability.
Ivan B Ivanov1, Radomir I Slavchov, Elka S Basheva
1Laboratory of Chemical Physics & Engineering, University of Sofia, Bulgaria. ii@lcpe.uni-sofia.bg
Advances in Colloid and Interface Science
|July 19, 2011
Summary
The Hofmeister effect is explained by counterion specific adsorption energy (u(0)). This energy parameter successfully predicts critical micelle concentration and electrostatic disjoining pressure in thin films and emulsion drops.
Area of Science:
- Physical Chemistry
- Colloid Science
- Surface Science
Background:
- The Hofmeister effect describes ion-induced changes in protein solubility and other properties.
- Understanding ion-specific effects is crucial for various applications, including colloid and interface science.
Purpose of the Study:
- To investigate the Hofmeister effect on critical micelle concentration (CMC), electrostatic disjoining pressure (Π(el)), and critical coalescence pressure (P(CR)).
- To develop a theoretical framework using counterion specific adsorption energy (u(0)) to explain these phenomena.
Main Methods:
- Literature data analysis for CMC.
- Experimental measurements of Π(el) and P(CR).
- Modification of existing theories using generalized Gouy equation and dimensionless surface potential (Φ(S)) incorporating u(0).
Main Results:
- Linear relationships were observed between ln(CMC), Φ(S), P(CR), and u(0), consistent with Hofmeister series.
- Experimental slopes for ln(CMC) and Φ(S) closely matched theoretical predictions.
- A hypothesis was proposed to explain the positive slopes observed for P(CR) versus u(0).
Conclusions:
- Counterion specific adsorption energy (u(0)) effectively unifies the studied phenomena influenced by the Hofmeister effect.
- u(0) emerges as a potential controlling factor and a valuable tool for studying the Hofmeister effect across various phenomena.
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