Abstract
The power-time curves of the micelle formation process were determined at four temperatures for a cationic surfactant [cetyltrimethylammonium bromide (CTAB)] in a non-aqueous solvent [N,N-dimethylformamide (DMF)] by titration microcalorimetry. From the data of the minimum of the titration point and the area of the power-time curves, values of their CMC and ΔH θm were obtained. Values of ΔG θm and ΔS θm were also calculated according to standard thermodynamic relations. For the cationic surfactant CTAB, the relationships involving the carbon numbers of the alcohols, the alcohol’s concentration, and the temperature on the CMC, and also the thermodynamic functions for micellization are discussed. For systems containing an identical concentration of various alcohols, values of the CMC, ΔH θm and ΔS θm increased whereas those of ΔG θm decreased with increasing temperature. For systems containing identical alcohol concentrations at the same constant temperature, values of the CMC, ΔH θm ,ΔG θm and ΔS θm decreased with increasing carbon number of the alcohol. For systems containing the same alcohol at the same temperature, the CMC and ΔG θm values increased whereas ΔH θm and ΔS θm decreased with increasing alcohol concentration.
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Zhang, Hl., Zhu, Y., Zhang, K. et al. Studies on the CMC and Thermodynamic Functions of a Cationic Surfactant in DMF/Long-Chain Alcohol Systems Using a Microcalorimetric Method. J Solution Chem 38, 187–198 (2009). https://doi.org/10.1007/s10953-008-9365-0
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DOI: https://doi.org/10.1007/s10953-008-9365-0