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To study the effect of tuned head group polarity on physicochemical properties of cetyl trimethyl ammonium bromide has been studied by conductance, surface tension and viscosity measurements. The critical micelle concentration was determined by conductance and surface tension measurements. Conductance measurement data was used to compute critical micelle concentration, average degree of micelle ionization and thermodynamic parameter of micellization. Surface tension data were further used to determine the surface excess concentration, minimum area per molecule at air-water interface. The decrease in effective Gibb's free energy with increase in head group polarity indicates that the micellization process is more favored over adsorption at the air-water interface. The intrinsic viscosity and hydration of micelle were observed to increase with increase in head group polarity and decrease with increase in temperature.

Effect of Tuned Head Polarity of Cetyl Trimethyl Ammonium Bromide on their Physicochemical Properties