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Spectrofluorimetric Determination of Second Critical Micellar Concentration of SDS and SDS/Brij 30 Systems |
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| Authors: | Ana Paula Romani Antonio Eduardo da Hora Machado Noboru Hioka Divinomar Severino Mauricio S. Baptista Lúcia Codognoto Maira R. Rodrigues Hueder Paulo Moisés de Oliveira |
| Affiliation: | 1. Departamento de Química–FFCLRP, Universidade de S?o Paulo, Ribeir?o Preto, Brazil 2. LAFOT–Instituto de Química, Universidade Federal de Uberlandia, Uberlandia, Minas Gerais, Brazil 3. Departamento de Química, Univeridade Estadual de Maringá, Maringá, Paraná, Brazil 4. Departamento de Bioquímica, Instituto de Química, Universidade de S?o Paulo, S?o Paulo, Brazil 5. Instituto de Pesquisa e Desenvolvimento—IP&D, Universidade do Vale do Paraíba—UNIVAP, Av. Shishima Hifumi 2911, Urbanova, CEP: 12244-000, S?o José dos Campos, SP, Brazil |
| Abstract: | Potentially useful stead-state fluorimetric technique was used to determine the critical micellar concentrations (CMC(1) and CMC(2)) for two micellar media, one formed by SDS and the other by SDS/Brij 30. A comparative study based on conductimetric and surfacial tension measurements suggests that the CMC(1) estimated by the fluorimetric method is lower than the value estimated by these other techniques. Equivalent values were observed for SDS micelles without Brij 30 neutral co-surfactant. The use of acridine orange as fluorescent probe permitted to determine both CMC(1) and CMC(2). Based on it an explanation on aspects of micelle formation mechanism is presented, particularly based on a spherical and a rod like structures. |
| Keywords: | SDS CMC Fluorescence Dyes Brij-30 |
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