A series of cationic surfactants of the type 1-(alkylcarbamoylmethyl)pyridinium chloride (C n cmpCl, n = 12, 14, 16) was synthesized in high yield by use of a simple method. The chemical structures of C n cmpCl were confirmed by 1H NMR and 13C NMR spectroscopy and ESI–MS. The surface activity of C n cmpCl and thermodynamic data for micelle formation were investigated by measurement of surface tension and conductivity in pure water and in aqueous solutions of sodium chloride of different concentration at different temperature. The results showed a general decrease of CMC for C n cmpCl with the aminoacylmethyl group compared with traditional pyridinium surfactants. The effect of NaCl concentration on the surface activity of C n cmpCl was obvious. However, CMCs of C n cmpCl are not sensitive to temperature in pure water. Elevation of temperature does not favor micelle formation, and increasing the length of the hydrophobic chain is beneficial to micelle formation. Moreover, micelle formation is a thermodynamically favorable process, and the micellization process is entropy-driven.
Research on Chemical Intermediates – Springer Journals
Published: Nov 26, 2013
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