Abstract
Surface tension measurements in aqueous cetyltrimethyl ammonium bromide were performed in presence of various amounts of 9-(hydroxymethyl)anthracene (AM), 9-[1-(1-hydroxy)ethyl]anthracene (THAE), and 9-[1-(1-hydroxy-2,2,2-trifluoro)ethyl]anthracene (TFAE). Free energies ΔG ⊝m and ΔG ⊝i of micellization and of adsorption to the air-water interface, respectively, were determined as well as the corresponding enthalpies and entropies. ΔG ⊝m of micellization increased in the presence of AM and THAE, but became more negative when TFAE was added. In contrast to AM and THAE, TFAE addition decreases ΔS ⊝i . For this peculiarity of TFAE, its location and orientation in micellar solution was investigated by means of UV and 19F-NMR spectroscopy.
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Bott, R., Wolff, T. Micellization of cetyltrimethylammonium bromide in the presence of 9-anthryl alkanols. Colloid Polym Sci 275, 850–859 (1997). https://doi.org/10.1007/s003960050157
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DOI: https://doi.org/10.1007/s003960050157