Abstract
The effect of 1-pentanol on the micellar properties of aqueous tetradecyltrimethylammonium bromide solutions (TTAB) was investigated when H 2O is progressively substituted by D 2O and when the hydrogenated alkyl chain of TTAB is replaced by a deuterated alkyl chain ( h-TTAB and d-TTAB, respectively). The CMC and the micelle aggregation number, hydrodynamic radius, and composition were obtained by means of conductimetry and elastic and quasi-elastic light-scattering measurements, in different experimental conditions (for several H 2 O D 2 O mixtures, with and without added hydrogenated pentanol and/or KBr, for h-TTAB and d-TTAB). The partition coefficient of 1-pentanol with a hydrogenated alkyl chain, between the micellar pseudophase and the bulk phase, was also determined. All the results indicate that the substitution of H 2O by D 2O strongly increases the pentanol partition coefficient in favor of the micelles even in the case of d-TTAB. Moreover, the hydrogenated pentanol has a much greater affinity for h-TTAB micelles than for d-TTAB micelles.
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