An anionic surfactant, that intentionally to mimic natural fatty acids, with highly conjugated component has been synthesized and analyzed by using NMR, FTIR and MS. The polar head group of the structure was linked to the hydrophobic tail through triazolyl moiety that formed from Cu(I) cycloaddition between an azidobenzoic acid and an acetylene. Critical micellar concentration (cmc) of the surfactant was determined at 0.1 mM by measuring their conductivity at constant pH consistent with UV-Visible absorption. Phase transitions of the surfactant were then observed by gradually decreasing the pH from 10 to 7. There are two stages of phase transitions observed at pH 8.9 and 7.6 upon the titration suggesting the transition from smaller size of aggregation structure into larger structure. The results indicate the aggregation mechanism of the synthesized surfactant greatly through conversion of head group from -COO − to -COOH that similar to natural fatty acids in aqueous.
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