Add time:09/30/2019         Source:infona.pl

A cationic dendrimer-type tetrameric surfactant (C 8 qbG0) with four octyl chains and four ammonium groups was synthesized by the reaction of poly(amidoamine) dendrimers with generation of zero and glycidyldimethyloctylammonium bromide. The physicochemical properties of C 8 qbG0 and of their mixtures with sodium dodecyl sulfate (SDS) were characterized by investigating surface tension, electrical conductivity, fluorescence of pyrene, and dynamic light-scattering. The critical micelle concentration (cmc) of C 8 qbG0 was 13 mmol dm - 3 at the concentration of one terminal group and the surface tension at the cmc attained 34 mN m - 1 . The occupied area of C 8 qbG0 was 1.94 nm 2 molecule - 1 , indicating that the tetrameric dendrimers adsorb widely at the air/water interface. The fluorescence intensity ratio of the first-to-third band in the emission spectra of pyrene for C 8 qbG0 decreased from around the cmc obtained by the surface tension measurement. The hydrodynamic radius of C 8 qbG0 determined by dynamic light-scattering was about 1.3 nm. The addition of SDS to the aqueous solutions of C 8 qbG0 enhanced the surface activities; the mixtures exhibited lower cmc, lower surface tension, and higher solubilization of pyrene than SDS alone. It was found that the mixtures of C 8 qbG0 and SDS form large aggregates due to the interactions between their alkyl chains as well as hydrophilic groups.

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