| Issue |
EPL
Volume 82, Number 5, June 2008
|
|
|---|---|---|
| Article Number | 58002 | |
| Number of page(s) | 6 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/82/58002 | |
| Published online | 26 May 2008 | |
Nonionic and ionic surfactants at an interface
Department of Physics, Kyoto University - Kyoto 606-8502, Japan
Corresponding author: onuki@scphys.kyoto-u.ac.jp
Received:
7
February
2008
Accepted:
14
April
2008
A Ginzburg-Landau theory is presented on surfactants in polar binary mixtures, which aggregate at an interface due to the amphiphilic interaction. They can be ionic surfactants coexisting with counterions. Including the solvation and image interactions and accounting for a finite-volume fraction of the surfactant, we obtain their distributions and the electric potential around an interface in equilibrium. The surface tension is also calculated. The distribution of the adsorbed ionic surfactant is narrower than that of the counterions. The adsorption is marked for hydrophilic and hydrophobic pairs of ionic surfactant and counterions
PACS: 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions) / 82.45.Gj – Electrolytes / 68.05.-n – Liquid-liquid interfaces
© EPLA, 2008
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