Knowledge of Micellar behavior of a surfactant is essential for its wide range of applications. Studies have been done on the micellar behavior of some of the cationic surfactants individually, by different methods, which is not sufficient to correlate the trend of change of properties of the surfactants in a particular series. A comprehensive study of Critical Micelle Concentration (CMC) and thermodynamic behavior of Tetradecyl Trimethylammonium Bromide (TTAB), Hexadecyl Trimethyl ammonium Bromide (CTAB) and Octadecyl Trimethylammonium Bromide (OTAB) has been herein conducted by conductivity measurements to represent the trend of micellar and thermodynamic properties of N-Alkyl Trimethylammonium Bromide Surfactant series, at different temperatures. The CMC studies have been utilized to evaluate the empirical relation (Stauff- Klevens rule), i.e. log CMC= A – Bn, for this homologous series at different temperatures. It was found that the value of B of this relation changes from 0.283 to 0.271 with increase of temperature. Thermodynamic parameters (?Gmo, ?Smo and ?Hmo) for these surfactants were calculated over the temperature range of 293K- 328K. It was found that ?Gmo values become more and more negative whereas ?Smo becomes more positive with increase of chain length of the surfactants. From the thermodynamic calculations it was found that the micellization processes of these surfactants are enthalpy and entropy controlled.

Author Name: Md. Manwarul Islam, Mohammad Rezaur Rahman, Md. Nazrul Islam

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Keywords: IJSER,2229-5518, 22295518,Md. Manwarul Islam, Mohammad Rezaur Rahman, Md. Nazrul Islam

ISSN: 22295518

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