The surface properties of sodium dodecylsulfate(SDS) and hexadecyl trimethyl amine bromide(CTAB) in the mixed solvent of ethylene glycol and water,which volume proportion is 1:1,has been studied by measuring the surfa...The surface properties of sodium dodecylsulfate(SDS) and hexadecyl trimethyl amine bromide(CTAB) in the mixed solvent of ethylene glycol and water,which volume proportion is 1:1,has been studied by measuring the surface tension.It was shown that the mixed system has the smaller surface tension when the SDS and CTAB are equimolar.In the meantime,composition of mixed surface adsorption layers and micelles,and their molecular interaction parameters have been calculated by iterative method according to the regular solution theory.The results showed that the mixed system has great synergistic effects on the surface tension reduction and mixed micelle formation.展开更多
The effect of alcohol on the aqueous two-phase system properties of SDS/CTAB/H 2O/Na 2SO 4 system was studied by the pseudo ternary phase diagram. The electrostatic forces (both attraction and repulsion) between catio...The effect of alcohol on the aqueous two-phase system properties of SDS/CTAB/H 2O/Na 2SO 4 system was studied by the pseudo ternary phase diagram. The electrostatic forces (both attraction and repulsion) between cationic surfactant and anionic surfactant decreased because of the interaction of alcohol hydroxyl group and surfactant polar group. As a result, the phase area width of aqueous two-phase system increased. Long chain alcohol (more than five carbonatoms), which was in high concentration in the SDS/CTAB/H 2O/Na 2SO 4 system, caused the anionic aqueous two-phase system area to vanish and the cationic aqueous two-phase system area to become wider. The CTAB rich phase turned from top phase to bottom phase.展开更多
文摘The surface properties of sodium dodecylsulfate(SDS) and hexadecyl trimethyl amine bromide(CTAB) in the mixed solvent of ethylene glycol and water,which volume proportion is 1:1,has been studied by measuring the surface tension.It was shown that the mixed system has the smaller surface tension when the SDS and CTAB are equimolar.In the meantime,composition of mixed surface adsorption layers and micelles,and their molecular interaction parameters have been calculated by iterative method according to the regular solution theory.The results showed that the mixed system has great synergistic effects on the surface tension reduction and mixed micelle formation.
文摘The effect of alcohol on the aqueous two-phase system properties of SDS/CTAB/H 2O/Na 2SO 4 system was studied by the pseudo ternary phase diagram. The electrostatic forces (both attraction and repulsion) between cationic surfactant and anionic surfactant decreased because of the interaction of alcohol hydroxyl group and surfactant polar group. As a result, the phase area width of aqueous two-phase system increased. Long chain alcohol (more than five carbonatoms), which was in high concentration in the SDS/CTAB/H 2O/Na 2SO 4 system, caused the anionic aqueous two-phase system area to vanish and the cationic aqueous two-phase system area to become wider. The CTAB rich phase turned from top phase to bottom phase.
