Solubilization of Pentanol by Micelles of Cationic Surfactants and Binary Mixtures of Cationic Surfactants in Aqueous Solution
| Autor: | Hirotaka Uchiyama, Matthew E. Morgan, Edwin E. Tucker, John F. Scamehorn, Sherril D. Christian |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Langmuir. 10:2170-2176 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la00019a024 |
| Popis: | The solubilization of pentanol in aqueous solutions of individual cationic surfactants and binary mixtures of cationic surfactants at 20[degree]C has been investigated using head-space chromatography. Complete solubilization isotherms have been determined for pentanol in micelles of the surfactants hexadecyl-pyridinium chloride (CPC), trimethyltetradecylammonium chloride (C[sub 14]Cl), benzyldimethyltetradecyl-ammonium chloride (C[sub 14]BzCl), benzyldimethylhexadecylammonium chloride (C[sub 16]BzCl), and hexadecyltrimethylammonium bromide (C[sub 16]Cl). In every case, a large decrease in the solubilization equilibrium (or partition) constant occurs on increasing the mole fraction of pentanol in the micelles (X); a factor of 3-5 reduction in the equilibrium constant occurs as X increases from nearly zero to nearly 0.9. Solubilization results have also been determined for mixed micelles of C[sub 14]Cl and C[sub 14]BzCl (system I) and CPC and C[sub 16]BzCl (system II). Large positive synergistic effects reported previously for system I and large antisynergistic effects for system II are not confirmed by the results of the present studies. For both of these mixed micellar systems, small decreases in the value of the solubilization equilibrium constant, relative to values predicted with an assumed additivity relationship, are observed. 38 refs., 10 figs., 1 tab. |
| Databáze: | OpenAIRE |
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