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Effect of caffeine on the micellization of anionic surfactant (SDS), cationic surfactant (HTAB) and non-ionic surfactant (Tx-100) was investigated using the conductometric and tensiometric techniques. The thermodynamic parameters such as change in Gibbs-free energy,, change in enthalpy of micellization,, change in entropy of micellization,, change in Gibbs-free energy of transfer,, surface excess concentration,, minimum area per surfactant molecule,, surface pressure,, change in Gibbs-free energy of adsorption,and other related parameters were calculated to gain insights into the interactions of caffeine with different surfactants at different temperatures. The CMC in mole fraction units,, values of SDS in caffeine are low, while that of HTAB are large in comparison with the values reported in water. The negative values ofandand the positive values ofare indicative of SDS-caffeine and HTAB-caffeine interactions.

physics and chemistry of liquids

Effect of caffeine on the micellization and related thermodynamic parameters of sodium dodecyl sulphate, hexadecyltrimethylammonium bromide and triton x-100: a physicochemical study