Blahnik, Jonas and Mueller, Eva and Braun, Lydia and Denk, Patrick and Kunz, Werner (2022) Nanoscopic microheterogeneities or pseudo-phase in non-conventional. CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 57: 101535. ISSN 1359-0294, 1879-0399
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This article discusses new concepts in macroscopically monophasic colloidal systems, where entropy is a major driving force for very subtle interactions and structuring. First, we show how microemulsion-similar structures can be achieved with hydrotropes. These aggregates are less defined in structure and of shorter lifetime than classical micelles but still potentially useful microheterogeneities with internal interfaces. The other extreme case of strong interactions is given when cationic and anionic surfactants are mixed in equimolar ratios. It is well known that surfactants can be made more soluble when ethylene oxide groups are incorporated. This strategy is applied for such 'catanionics' to avoid surfactant precipitation. Finally, we consider the fact that ethylene oxide groups increase the size of the hydrophilic headgroups of carboxylates so that the geometrical constraints compel a direct spherical shape even in the absence of water. As a result, 'water-free direct microemulsions' with only charged surfactants and oil are conceivable.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | WATER-OIL MICROEMULSIONS; SURFACTANT-FREE MICROEMULSIONS; SPONTANEOUS VESICLE FORMATION; DETERGENTLESS MICROEMULSIONS; CATANIONIC SURFACTANTS; EXTENDED SURFACTANTS; ENZYMATIC-REACTIONS; DETAILED CHARACTERIZATION; TERNARY-SYSTEMS; CLOUD POINT; Surfactant-free microemulsions; Catanionics; COMPLET; Three block surfactants |
| 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: | Petra Gürster |
| Date Deposited: | 29 Nov 2022 05:58 |
| Last Modified: | 29 Nov 2022 05:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46192 |
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