The effect of counterion on critical micelle concentration of surfactants in nonaqueous media
| Autor: | Kenjiro Meguro, Shinya Muto, Yoshikazu Shimazaki |
|---|---|
| Rok vydání: | 1974 |
| Předmět: |
chemistry.chemical_classification
Thermodynamics of micellization Inorganic chemistry Micelle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Pulmonary surfactant Critical micelle concentration Carboxylate Counterion Absorption (chemistry) Energy source |
| Zdroj: | Journal of Colloid and Interface Science. 49:173-176 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/0021-9797(74)90349-x |
| Popis: | Critical micelle concentrations (CMC) of dodecylammonium acetate, propionate, butyrate, caprylate, caprate, and laurate were determined from spectral changes based on the solubilization of 7,7,8,8-tetracyanoquinodimethane (TCNQ). When TCNQ was solubilized in non-aqueous solutions of these surfactants above the CMC, the absorption bands based on an interaction between surfactants and TCNQ appeared at about 233, 272, and 415 nm. Below the CMC, only a small absorption band for the neutral TCNQ molecule was observed at 396 nm, and the intensity of this band decreased with the surfactant concentration. When the CMC values obtained by this method were plotted against the carbon number of the carboxylate counterion of the surfactant molecule, the CMC values were found to increase linearly with carbon number. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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