Interaction of a Novel Anionic Gemini Surfactant Containing a Triazine Ring with Cetyltrimethylammonium Bromide in Aqueous Solution

Abstract

AbstractThe interaction between a novel anionic gemini surfactant containing a triazine ring, denoted as C8‐G, and cetyltrimethylammonium bromide (CTAB) has been investigated in aqueous solution. The surface tension vs log. molar concentration plots of the individual surfactants and their mixtures were measured at different temperatures (298, 303, 308, and 313 K) by the drop volume method. The surface properties and the interaction parameters of the adsorption monolayer and the mixed micelle were obtained from the plot. The results showed that the CMC of the C8‐G/CTAB mixture reached a minimum value of 3.20 × 10−5 mol/L when αG (the mole fraction of C8‐G in the mixed system) was 0.7 at 308 K, and the minimum γCMC was 28.1 mN/m obtained for the molar ratio of 0.9 at 308 K. Interaction between the two components was strongest () when αG was 0.7 at 303 K. All the C8‐G/CTAB mixtures exhibited synergism in both surface tension reduction efficiency and mixed micelle formation except when the mole fraction of C8‐G (αG) was 0.1, 0.5 and 0.9 at 313 K, and became greatest for the molar ratio of 0.7 at 303 K. The C8‐G/CTAB mixtures exhibited synergism in surface tension reduction effectiveness for all the complex ratios at 303 K, αG = 0.1, 0.3, 0.9 at 308 K and αG = 0.7 at 313 K, whereas the other surfactant mixtures did not show this synergism.