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- W3083644674 abstract "• Densities for aqueous solutions of cationic surfactants (C 8 TAC/C 14 TAC) are reported. • Application of the pseudophase model of micellization is made for obtaining cmc . • The magnitudes of cmc values are in the order of C 8 TAC > C 14 TAC. • Change in the apparent molar volume due to aggregation is found to be positive. Densities for aqueous solutions of cationic surfactants, namely, octyltrimethylammonium chloride (C 8 TAC) and tetradecyltrimethylammonium chloride (C 14 TAC) in the concentration range (0.0102–0.2599) mol⋅kg −1 have been measured at (293.15, 298.15 and 303.15) K. Further, experimental density data are utilized for the calculations of apparent molar volumes of solute ( V ϕ ) at studied temperatures. The coefficient of thermal expansion (α) and apparent molar expansivity ( E ϕ ) are also obtained at 298.15 K. Application of pseudo-phase model of micellization to the V ϕ data is made for obtaining critical micelle concentration ( cmc ) of the studied surfactants . The magnitudes of cmc values are in the order of C 8 TAC > C 14 TAC. The change in the apparent molar volume due to aggregation ( Δ V ϕ , m ) is found to be dependent on temperature as well on the chain length of the alkyltrimethlyammoinium ions. Δ V ϕ , m slightly increases with increase in temperature and in chain length of the alkyltrimethlyammoinium ions. The standard free energy change due to micellization ( Δ G m 0 ) have also been estimated. All the results are explained on the basis of micellization of the surfactant molecules, hydrophobicity due to alkyl chain length and nature of the counter-ion." @default.
- W3083644674 created "2020-09-11" @default.
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- W3083644674 date "2021-01-01" @default.
- W3083644674 modified "2023-09-23" @default.
- W3083644674 title "Thermodynamic studies of aggregation behaviour of cationic surfactants (octyltrimethylammonium chloride/tetradecyltrimethylammonium chloride) in aqueous solutions at different temperatures" @default.
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- W3083644674 doi "https://doi.org/10.1016/j.jct.2020.106282" @default.
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