Bauduin, Pierre and Renoncourt, Audrey and Kopf, A. and Touraud, Didier and Kunz, Werner (2005) Unified concept of solubilization in water by hydrotropes and cosolvents. LANGMUIR, 21 (15). pp. 6769-6775. ISSN 0743-7463,
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In the present work hydrophobic dyes, i.e. disperse red 13 (DR-13; (2-[4-(2-chloro-4-nitrophenylazo)N-ethylphenylaminol ethanol) and Jaune au gras W1201 (1H-indene-1,3(2H)-dione,2-(2-quinolinyl)), are solubilized in water with the help of different additives: acetone and 1-propanol as typical cosolvents, sodium xylene sulfonate (SXS) as a representative of a classical hydrotrope, sodium dodecyl sulfate (SDS) as a typical surfactant, and finally some "solvosurfactants" [ propylene glycol monoalkyl ether derivatives (CiPOj: i = 1 = I and 3; i = 3,j = 1 and 2; i = 4 and tertio-butyl,j = 1) and 1-propoxy-2-ethanol (C3EO1)1 These solvosurfactants are short amphiphiles that do not form well-defined structures in water such as micelles. For all additives an exponential increase in the solubilizations of the two studied hydrophobic dyes was observed when their concentrations in water were increased. Except for the SDS solution, no difference in the overall shapes of the solubilization curves (dye solubility against additive concentration) was found. All the studied molecules were classified according to their hydrotropic efficiencies, i.e., their abilities to solubilize a hydrophobic, sparingly soluble compound in water. The volume of the hydrophobic parts of the studied additives, roughly evaluated by simple calculations, was found to influence strongly the hydrotropic efficiency; i.e. the larger the hydrophobic part of the additive, the better the hydrotropic efficiency. By contrast, the hydrophilic part carrying a charge or not is of minor importance. Taking the hydrophobic part of the molecules as the key parameter, the water solubilization efficiency of cosolvents, hydrotropes, and solvosurfactants can be described in a coherent way.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | AQUEOUS-SOLUTION; MIXTURES; SPECTROMETRY; TEMPERATURE; RELAXATION; BEHAVIOR; PROLINE; |
| 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: | 04 May 2021 07:31 |
| Last Modified: | 04 May 2021 07:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/35875 |
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