Zemb, Thomas N. and Klossek, Michael and Lopian, Tobias and Marcus, Julien and Schoeettl, Sebastian and Horinek, Dominik and Prevost, Sylvain F. and Touraud, Didier and Diat, Olivier and Marcelja, Stjepan and Kunz, Werner (2016) How to explain microemulsions formed by solvent mixtures without conventional surfactants. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 113 (16). pp. 4260-4265. ISSN 0027-8424,
Full text not available from this repository. (Request a copy)Abstract
Ternary solutions containing one hydrotrope (such as ethanol) and two immiscible fluids, both being soluble in the hydrotrope at any proportion, show unexpected solubilization power and allow strange but yet unexplained membrane enzyme activity. We study the system ethanol-water-octanol as a simple model of such kinds of ternary solutions. The stability of "detergentless" micelles or microemulsions in such mixtures was proposed in the pioneering works of Barden and coworkers [Smith GD, Donelan CE, Barden RE (1977) J Colloid Interface Sci 60(3): 488-496 and Keiser BA, Varie D, Barden RE, Holt SL (1979) J Phys Chem 83(10): 1276-1281] in the 1970s and then, neglected, because no general explanation for the observations was available. Recent direct microstructural evidence by light, X-ray, and neutron scattering using contrast variation reopened the debate. We propose here a general principle for solubilization without conventional surfactants: the balance between hydration force and entropy. This balance explains the stability of microemulsions in homogeneous ternary mixtures based on cosolvents.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NONIONIC MICELLAR-SOLUTIONS; WEAKLY STRUCTURED MIXTURES; ANGLE NEUTRON-SCATTERING; HYDROTROPIC SOLUTIONS; TERNARY-SYSTEMS; WATER; PHASE; OIL; EQUILIBRIA; TRANSITION; microemulsions; aggregation; micelles; hydrotrope; hydration force |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Apr 2019 07:10 |
| Last Modified: | 05 Apr 2019 07:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3065 |
Actions (login required)
 |
View Item |
