FORMATION OF MICELLES OF CETYL TRIMETHYLAMMONIUM BROMIDE IN WATER-GLYCEROL SOLUTIONS
Abstract:
<p align="justify"> The micellization of cetyltrimethylammonium bromide (CTAB) in glycerol and aqueous solutions of glycerol was studied by means of surface tensiometry. The critical micellar concentration (CMC) was determined at 25 °C and 40 Δ C, and thermodynamic parameters such as the free energy of micellization ΔG°mis, enthalpy ΔH and entropy ΔS of micellization were also measured At 40 °C, CTAB forms micelles in pure glycerol and in the entire range of water-glycerol solutions. For 25 °C, the CMC ranged from 9.2 x 10·4 Min pure water to 8.5 x 10·3M for solutions containing 90% glycerol by volume. The corresponding values obtained/or ΔG° were -4.14 and -2.82 kcal/mole; for ΔH° were -1.03 kcal/mole and -3.73 kcal/mole and for ΔS° were + 10.43 and -3.10 e. u. Addition of glycerol decreases the spontaneity of micelles formation of CTAB in water. </p>
<p align="justify"> The micellization of cetyltrimethylammonium bromide (CTAB) in glycerol and aqueous solutions of glycerol was studied by means of surface tensiometry. The critical micellar concentration (CMC) was determined at 25 °C and 40 Δ C, and thermodynamic parameters such as the free energy of micellization ΔG°mis, enthalpy ΔH and entropy ΔS of micellization were also measured At 40 °C, CTAB forms micelles in pure glycerol and in the entire range of water-glycerol solutions. For 25 °C, the CMC ranged from 9.2 x 10·4 Min pure water to 8.5 x 10·3M for solutions containing 90% glycerol by volume. The corresponding values obtained/or ΔG° were -4.14 and -2.82 kcal/mole; for ΔH° were -1.03 kcal/mole and -3.73 kcal/mole and for ΔS° were + 10.43 and -3.10 e. u. Addition of glycerol decreases the spontaneity of micelles formation of CTAB in water. </p>
DOI: 10.48141/SBJCHEM.v6.n7.1998.66_1998_2.pdf
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