Diat, Olivier and Klossek, Michael L. and Touraud, Didier and Deme, Bruno and Grillo, Isabelle and Kunz, Werner and Zemb, Thomas (2013) Octanol-rich and water-rich domains in dynamic equilibrium in the pre-ouzo region of ternary systems containing a hydrotrope. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 46. pp. 1665-1669. ISSN 0021-8898, 1600-5767
Full text not available from this repository. (Request a copy)Abstract
Ternary mixtures of medium-chain fatty alcohols, water and a hydrotrope (such as ethanol), near the immiscibility gap, make stable single phases at constant temperature. Interestingly, in this 'pre-ouzo region' these single phases consist of two distinct nanoscopic pseudo-phases, one octanol-rich and one water-rich. This domain of composition, which is known to produce strong light scattering and to separate under ultracentrifugation into two phases, has been studied using contrast variation in small-angle neutron scattering (SANS) combined with small-and wide-angle X-ray scattering (SWAXS). The existence of fatty alcohol-rich domains of well defined size of the order of 2 nm radius is proven. The scattering can be approximated by an Ornstein-Zernike function, which is close to the general expression of Choi, Chen, Sottmann & Strey [Physica B, (1998), 241-243, 976-978] with vanishing quadratic Porod term. Exploitation of the relative intensities at the vanishing scattering angle in SANS demonstrates that the distribution coefficient of ethanol between the octanol-rich and the water-rich domains is close to one. WAXS of the two coexisting pseudo-phases is compared with the corresponding binary water-ethanol and octanol-ethanol samples.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANGLE NEUTRON-SCATTERING; X-RAY-SCATTERING; INTERFACIAL CURVATURES; OIL MICROEMULSIONS; DETERGENTLESS MICROEMULSIONS; BICONTINUOUS MICROEMULSIONS; ENZYMATIC-REACTIONS; CONTRAST VARIATION; PHASE-DIAGRAM; MIXTURES; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Mar 2020 07:06 |
| Last Modified: | 25 Mar 2020 07:06 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15627 |
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