Abstract
The micellization behavior of cetyltrimethylammonium bromide (CTAB) in water , 0.1, 0.2, 0.3, and 0.4 volume fractions of methanol at 298.15, 308.15, 318.15, and 323.15 K were investigated by surface tension measurements. The effect of methanol on values of critical micelle concentration (cmc), free energies of micellization ΔGmo, and surface properties viz. maximum surface excess concentration Γmax, area occupied by per surfactant molecule Amin, surface pressure πcmc, solution surface tension γcmc, solvent surface tension (γo), free energies of adsorption ΔGadso, the efficiency of adsorption (pC20), effective Gibbs free energy ΔGeffo, and free energy of surface at equilibrium (Gmin) were investigated using surface tension values. Other parameters such as the packing parameter (P), aggregation number (N), concentration of surfactant in the bulk phase (C20), relation between Amin and πcmc, and correlation of slopes dγ/d log C, γo/γcmc, Γ/Γmax, cmc/C20, ΔGadso/ΔGmo, and cmc/pC20 with the volume fraction of methanol are calculated and discussed in the light of the experiment done.
Highlights
Surfactants are a group of organic compounds with a hydrophilic head and a hydrophobic tail due to which they reduce surface tension and are known as surface-active agents. ey are used in almost all areas of applications because of their unique properties
E stability of micelle in solution is due to soft interactions between amphiphile molecules. e main soft interactions acting in the amphiphilic self-assembly are hydrogen bonding, hydrophobic effects, electrostatic interaction, and van der Waals forces
In the surface tension method, a concentrated solution of cetyltrimethylammonium bromide (CTAB) was prepared in water and mixed solvents of the methanol-water mixture at 298.15 K. e solutions of CTAB were diluted by the internal dilution method with the help of a microsyringe to vary the concentration of CTAB
Summary
Surfactants are a group of organic compounds with a hydrophilic head and a hydrophobic tail ( known as amphiphiles) due to which they reduce surface tension and are known as surface-active agents. ey are used in almost all areas of applications because of their unique properties. Ey are used in almost all areas of applications because of their unique properties It is well-known that the head part shows the hydrophobic nature and tail shows hydrophilic nature. E main soft interactions acting in the amphiphilic self-assembly are hydrogen bonding, hydrophobic effects, electrostatic interaction, and van der Waals forces. E stability of micelle in solution is due to soft interactions between amphiphile molecules. Such interactions are so flexible that a minor disturbance in the system causes significant changes in the physicochemical and surface properties of the surfactant solution [2]. Some factors that directly affect the physicochemical properties and surface properties of the micellar system are additives, temperature, and solvent composition [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
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