[article]
| Titre : |
Effect of micellar aggregates on the kinetics of dextrose oxidation by N-bromosuccinimide |
| Type de document : |
texte imprimé |
| Auteurs : |
Y. Katre, Auteur ; A. K. Singh, Auteur ; M. Singh, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p. 98-105 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
Catalyse micellaire Oxydation Cinétique Concentration critique (CMC) Réactions bimoléculaires |
| Index. décimale : |
668.1 Agents tensioactifs : savons, détergents |
| Résumé : |
The kinetics of oxidation of dextrose by N-bromosuccinimide (NBS) has been investigated in the presence of cationic cetyltrimethylammonium bromide (CTAB) surfactant in sulfuric acid (H2SO4) medium. Similarly in absence of CTAB solution, the reaction followed fractional, first, and negative fractional-order kinetics with respect to [dextrose], [NBS] and [H2SO4], respectively. Although the reaction mechanism remained unaltered by micelles, a typical kpsi-[CTAB] profile was observed, that is, with a progressive increase in [CTAB], the reaction rate increased, reached a maximum value, and then decreased. The results are treated quantitatively in terms of Berezin's model. Activation parameters were also evaluated and a negative value of deltaS# shows the formation of well-structured activated complex. The influence of salts on the reaction rates has also been seen. On the basis of product analysis, a pertinent mechanism is proposed. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8878 |
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 2/2010 (03-04/2010) . - p. 98-105
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