Surface Activity Properties of Chiral L-Lysine Based Gemini Surfactants

doi:10.7503/cjcu20130731

Abstract

Abstract:

Surface activity properties and critical micelle aggregation numbers of [C₁₂-m-C₁₂] Na₂(m=2,4,6) and [C₁₂-T-C₁₂] Na₂ 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 [C₁₂-2-C₁₂] Na₂< [C₁₂-4-C₁₂] Na₂< [C₁₂-6-C₁₂] Na₂< [C₁₂-T-C₁₂] Na₂, which were in aggreement with the sequence of Γ_max. The results show that the surface activites of [C₁₂-m-C₁₂] Na₂ and [C₁₂-T-C₁₂] Na₂ are high. ΔG_m⁰ and ΔH_m⁰ are negative, the absolute value of ΔH_m⁰ is much smaller than the product of ΔS_m⁰ 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_m⁰ and ΔH_m⁰ of the surfactants increase, ΔS_m⁰ and critical micelle aggregation numbers of the surfactants decrease. The circular dichroism indicated the formation of chiral helical aggregates above the cmc.

Key words: Chiral, Gemini surfactant, L-Lysine, Aggregation number of micelle, Thermodynamic parameter of micelle formation

CLC Number:

O647.2

TrendMD:

LIANG Ya-Qin, HU Zhi-Yong, CAO Duan-Lin, LIANG Dong. Surface Activity Properties of Chiral L-Lysine Based Gemini Surfactants[J]. Chem. J. Chinese Universities, 2013, 34(12): 2783.

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