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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spectrofluorimetric Determination of Second Critical Micellar Concentration of SDS and SDS/Brij 30 Systems

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Author(s):
Romani, Ana Paula [1] ; da Hora Machado, Antonio Eduardo [2] ; Hioka, Noboru [3] ; Severino, Divinomar [4] ; Baptista, Mauricio S. [4] ; Codognoto, Lucia [5] ; Rodrigues, Maira R. [5] ; Moises de Oliveira, Hueder Paulo [5]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Dept Quim, FFCLRP, BR-14049 Ribeirao Preto - Brazil
[2] Univ Fed Uberlandia, Inst Quim, LAFOT, BR-38400 Uberlandia, MG - Brazil
[3] Univ Estadual Maringa, Dept Quim, Maringa, Parana - Brazil
[4] Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-01498 Sao Paulo - Brazil
[5] Univ Vale Paraiba UNIVAP, Inst Pesquisa & Desenvolvimento IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Fluorescence; v. 19, n. 2, p. 327-332, MAR 2009.
Web of Science Citations: 21
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. (AU)