The bactericidal activities of two series of quaternary Gemini surfactants have been examined by the suspension quantitative germicidal tests against Escherchia, Staphylococcus aureus and Candida alibicans respectivel...The bactericidal activities of two series of quaternary Gemini surfactants have been examined by the suspension quantitative germicidal tests against Escherchia, Staphylococcus aureus and Candida alibicans respectively, the dodecyltrimethylammonium bromide(C 12TABr) was used for comparison. All of the quaternary Gemini surfactants showed superior bactericidal activities to C 12TABr due to higher densities in both headgroup charge and alkyl chains.展开更多
C 12-6-C 12·2Br violently interacts with sodium dodecyl sulfate(SDS) leading to the formation of mixed micelles. When molar fraction(x 2) of C 12-6-C 12·2Br in the bulk solution was 10.0%, the total critical...C 12-6-C 12·2Br violently interacts with sodium dodecyl sulfate(SDS) leading to the formation of mixed micelles. When molar fraction(x 2) of C 12-6-C 12·2Br in the bulk solution was 10.0%, the total critical micelle concentration(cmc T) of the mixed solution was found to be 0.043 7 mmol/L, and the micelle aggregation number N T and the molar fraction(xM 2) of C 12-6-C 12·2Br in the mixed micelle were 17.4 and 49.0%, respectively. With x 2 increased to 16.7%, cmc T further decreased and N T gradually increased, but xM 2 almost remained unchanged. The average value of the interaction parameter(β M) calculated by the theory of regular solution equals to -33.3.展开更多
文摘The bactericidal activities of two series of quaternary Gemini surfactants have been examined by the suspension quantitative germicidal tests against Escherchia, Staphylococcus aureus and Candida alibicans respectively, the dodecyltrimethylammonium bromide(C 12TABr) was used for comparison. All of the quaternary Gemini surfactants showed superior bactericidal activities to C 12TABr due to higher densities in both headgroup charge and alkyl chains.
文摘C 12-6-C 12·2Br violently interacts with sodium dodecyl sulfate(SDS) leading to the formation of mixed micelles. When molar fraction(x 2) of C 12-6-C 12·2Br in the bulk solution was 10.0%, the total critical micelle concentration(cmc T) of the mixed solution was found to be 0.043 7 mmol/L, and the micelle aggregation number N T and the molar fraction(xM 2) of C 12-6-C 12·2Br in the mixed micelle were 17.4 and 49.0%, respectively. With x 2 increased to 16.7%, cmc T further decreased and N T gradually increased, but xM 2 almost remained unchanged. The average value of the interaction parameter(β M) calculated by the theory of regular solution equals to -33.3.
