NDLI: The impact of the structuring of hydrotropes in water on the mesoscale solubilisation of a third hydrophobic component

Content Provider	Royal Society of Chemistry (RSC)
Author	Kunz, Werner Touraud, Didier Pfitzner, Arno Winkler, Robert Krickl, Sebastian Buchecker, Thomas Grillo, Isabelle Bauduin, Pierre
Copyright Year	2017
Abstract	In the present contribution, the pre-structuring of binary mixtures of hydrotropes and H2O is linked to the solubilisation of poorly water miscible compounds. We have chosen a series of short-chain alcohols as hydrotropes and benzyl alcohol, limonene and a hydrophobic azo-dye (Disperse Red 13) as organic compounds to be dissolved. A very weak pre-structuring is found for ethanol/H2O and 2-propanol/H2O mixtures. Pre-structuring is most developed for binary 1-propanol/H2O and tert-butanol/H2O mixtures and supports the bicontinuity model of alcohol-rich and water-rich domains as already postulated by Anisimov et al. Such a pre-structuring leads to a high solubilisation power for poorly water miscible components (limonene and Disperse Red, characterized by high octanol/water partition coefficients, log(P) values of 4.5 and 4.85), whereas a very weak pre-structuring leads to a high solubilisation power for slightly water miscible components (benzyl alcohol). This difference in solubilisation power can be linked to (i) the formation of mesoscale structures in the cases of ethanol and 2-propanol and (ii) the extension of pre-structures in the cases of 1-propanol and tert-butanol. Three different solubilisation mechanisms could be identified: bulk solubilisation, interface solubilisation and a combination of both. These supramolecular structures in binary and ternary systems were investigated by small-and-wide-angle X-ray and neutron scattering, dynamic light scattering and conductivity measurements (in the presence of small amounts of salt).
Starting Page	1806
Ending Page	1816
Page Count	11
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	3
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp06696h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Properties of water Ethanol Neutron diffraction Octanol Benzyl alcohol Hydrophobe Tert-Butyl alcohol Anisimov Isopropyl alcohol X-ray crystallography Azo compound Dynamic light scattering 1-Propanol Miscibility Mesoscopic physics Limonene Red 13
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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