Abstract
A biphasic solution containing water and precipitated phosphocholine (PC) is presented in order to investigate the consequences of 1,3-butanediol addition on the phase behavior of PC at different 1,3-butanediol concentrations and temperature values. With increasing the concentration of 1,3-butanediol in the mixed solvent at room temperature, the biphasic solution converts into turbid phase, two phase, and finally to a clear phase that is birefringent when viewed between two crossed polarizers. The birefringent phase moves to lower 1,3-butanediol contents at higher temperature values. The birefringent phase was observed via polarizing microscopy, and its rheological parameters were measured with cone plate method. In high 1,3-butanediol contents, solutions with 2.5% of PC behave as a gel with high yield stress value. The micellization of cetyltrimethyammonium bromide (CTAB) in a series of 1,3-butanediol/water mixed solvent at room temperature was also investigated. From the conductivity measurements, the critical micelle concentration and the degree of counterion dissociation of CTAB were obtained as a function of 1,3-butanediol. Standard free energy of micellization, as a function of 1,3-butanediol contents, was also estimated and discussed. Gibbs energies of micellization were found to have a good correlation with dielectric constant and Gordon parameters.
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Acknowledgments
The author acknowledges Prof. Dr. Heinz Hoffmann for bringing the idea of using 1,3-butanediol in these combinations and also for his useful notes and discussions. Prof. Dr. Grehard Platz is also acknowledged for his kind help in polarization microscopy measurements.
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Abdel-Rahem, R.A. 1,3-Butanediol as a co-solvent for the surfactant solutions. Colloid Polym Sci 290, 907–917 (2012). https://doi.org/10.1007/s00396-012-2603-4
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DOI: https://doi.org/10.1007/s00396-012-2603-4