Klaus, Angelika and Tiddy, Gordon J. T. and Solans, Conxita and Harrar, Agnes and Touraud, Didier and Kunz, Werner (2012) Effect of Salts on the Phase Behavior and the Stability of Nano-Emulsions with Rapeseed Oil and an Extended Surfactant. LANGMUIR, 28 (22). pp. 8318-8328. ISSN 0743-7463,
Full text not available from this repository.Abstract
For many decades, the solubilization of long-chain triglycerides in water has been a challenge. A new class of amphiphiles has been created to overcome this solubilization problem. The so-called "extended" surfactants contain a hydrophilic-lipophilic linker to reduce the contrast between the surfactant-water and surfactant-oil interfaces. In the present contribution, the effects of different anions and cations on the phase behavior of a mixture containing an extended surfactant (X-AES), a hydrotrope (sodium xylene sulfonate, SXS), water, and rapeseed oil were determined as a function of temperature. Nanoemulsions were obtained and characterized by conductivity measurements, light scattering, and optical microscopy. All salting-out salts show a transition from a clear region (O/W nanoemulsion), to a lamellar liquid crystalline phase region, a clear phase (bicontinuous L-3), and again to a lamellar liquid crystalline phase region with increasing temperature. For the phase diagrams with NaSCN and Na2SO4, only one clear region (O/W nanoemulsion) was observed, which turns into a lamellar phase region at elevated temperatures. Furthermore, the stability of the nanoemulsions was investigated by time-dependent measurements: the visual observation of phase separation, droplet size by dynamic light scattering (DLS), and optical microscopy. The mechanism of the different phase transitions is also discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NONIONIC SURFACTANT; VEGETABLE-OILS; DETAILED CHARACTERIZATION; IMPROVING SOLUBILIZATION; MODEL MICROEMULSIONS; LIQUID-CRYSTALS; POLAR OILS; TEMPERATURE; WATER; EMULSIFICATION; |
| 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: | 12 May 2020 06:13 |
| Last Modified: | 12 May 2020 06:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18596 |
Actions (login required)
 |
View Item |
