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- W2354127777 abstract "Surface activity properties and critical micelle aggregation numbers of [C 12-m-C 12 ]Na 2(m=2,4,6) and [C 12-T-C 12 ]Na 2 were determined by surface tension,electrical conductivity and steady fluorescene probe methods.The values of critical micelle concentration(cmc),γ cmc and per surfactant molecule(A min) derived from surface tension measurement were found to be in the order of [C 12-2-C 12 ]Na 2 [C 12-4-C 12 ]Na 2 [C 12-6-C 12 ]Na 2 [C 12-T-C 12 ]Na 2,which were in aggreement with the sequence of Γ max.The results show that the surface activites of [C 12-m-C 12 ]Na 2 and [C 12-T-C 12 ]Na 2 are high.ΔG—0 m and ΔH—0 m are negative,the absolute value of ΔH—0 m is much smaller than the product of ΔS—0 m and temperature in the aqueous solution.The thermodynamic parameters of micellization of the four Gemini surfactants indicate that the micellization process is an enthopy-driven,exothermic and spontaneous process.As the spacer lengthens from 2 to 6 or the rigidity of the spacer strengthens,which results in a decrease in the ability of micelles to form,ΔG—0 m and ΔH—0 m of the surfactants increase,ΔS—0 m and critical micelle aggregation numbers of the surfactants decrease.The circular dichroism indicated the formation of chiral helical aggregates above the cmc." @default.
- W2354127777 created "2016-06-24" @default.
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- W2354127777 date "2013-01-01" @default.
- W2354127777 modified "2023-09-24" @default.
- W2354127777 title "Surface Activity Properties of Chiral L-Lysine Based Gemini Surfactants" @default.
- W2354127777 hasPublicationYear "2013" @default.
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