Micellar behavior of aqueous solutions of dodecyldimethylethylammonium bromide, dodecyltrimethylammonium chloride and tetradecyltrimethylammonium chloride in the presence of α-, β-, HPβ-and γ-cyclodextrins

Mehta, S.K. and Bhasin, K.K. and Dham , Shilpee and Singla, M.L. (2008) Micellar behavior of aqueous solutions of dodecyldimethylethylammonium bromide, dodecyltrimethylammonium chloride and tetradecyltrimethylammonium chloride in the presence of α-, β-, HPβ-and γ-cyclodextrins. Journal of colloid and interface science, 321 (2). pp. 442-451. ISSN 0021-9797

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Abstract

Conductivity, static fluorescence and 1 H NMR measurements have been carried out to study the micellar behavior of aqueous solutions of dodecyldimethylethylammonium bromide (DDAB), dodecyltrimethylammonium chloride (DTAC) and tetradecyltrimethylammonium chloride (TDAC) in absence and presence of α -cyclodextrin ( α -CD), β -cyclodextrin ( β -CD), hydroxypropyl- β -cyclodextrin (HP β -CD) and γ -cyclodextrin ( γ -CD). The conductivity measurements were carried out at 298.15 K. The influence of cyclodextrins on the micellar parameters, such as cmc * (apparent critical micellar concentration), β (degree of ionization) have been analyzed. Thermodynamics of the systems was discussed in terms of the change in standard free energy of micellization, . Micellization was found to be less spontaneous in presence of cyclodextrins. The fluorescence intensity of the surfactant solutions is enhanced by the addition of cyclodextrins. The association constants obtained from conductivity and fluorescence data suggest the binding of γ -CD with the surfactants to be strongest among all the cyclodextrins used. 1 H NMR chemical shift changes provide powerful means for probing the cyclodextrin–micellar interactions and inclusion of surfactant is shown by the change in the chemical shift of some of the guest and host protons in comparison with the chemical shifts of the same protons in the free compounds.

Item Type: Article
Uncontrolled Keywords: Ionic surfactant; Quaternary ammonium compound;Cationic surfactant; NMR spectrometry;Fluorescence;Conductivity; Cyclodextrin;Chlorides;Bromides;Aqueous solution;
Subjects: CSIO > Chemistry
Divisions: Agri - Instrumentation
Depositing User: Ms T Kaur
Date Deposited: 02 Feb 2012 14:58
Last Modified: 13 Apr 2012 17:22
URI: http://csioir.csio.res.in/id/eprint/208

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