The aqueous cationic system sodium undecenoate-dodecyltrimethylammonium bromide at low concentration
The aqueous sodium undecenoate (SUD) -dodecyltrimethylammonium bromide (DTAB) catanionic system was studied at low concentration. The system did not precipitate, even at a 1:1 SUD:DTAB proportion, but showed the formation of a coacervate in a range of surfactant mixture compositions. Micelles have a...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/96945 |
| Acceso en línea: | http://hdl.handle.net/11336/96945 |
| Access Level: | acceso abierto |
| Palabra clave: | CATANIONIC SURFACTANT COACERVATION CRITICAL MICELLE CONCENTRATION DODECYLTRIMETHYLAMMONIUM BROMIDE SODIUM UNDECENOATE https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | The aqueous sodium undecenoate (SUD) -dodecyltrimethylammonium bromide (DTAB) catanionic system was studied at low concentration. The system did not precipitate, even at a 1:1 SUD:DTAB proportion, but showed the formation of a coacervate in a range of surfactant mixture compositions. Micelles have a preferential composition of 0.37 mole fraction of SUD. This behavior is attributed to the presence of the double bond at the distal extreme of the SUD molecule, which can form hydrogen bonds with water. Consequently, the -CH = CH2 group is situated at the interface between the hydrocarbon micelle core and water, reducing the interfacial free energy. Structural computations demonstrate that the mentioned SUD proportion produces complete coverage of the micelle surface by the double bonds. |
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