高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (12): 2783.doi: 10.7503/cjcu20130731

• 物理化学 • 上一篇    下一篇

手性赖氨酸基Gemini表面活性剂的表面性能

梁亚琴1,2, 胡志勇1, 曹端林1, 梁栋1   

  1. 1. 中北大学化工与环境学院, 太原 030051;
    2. 长治学院化学系, 长治 046011
  • 收稿日期:2013-07-29 出版日期:2013-12-10 发布日期:2013-09-29
  • 作者简介:胡志勇,男,博士,副教授,主要从事精细化学品的合成和应用研究. E-mail:huzhiyong@nuc.edu.cn
  • 基金资助:

    山西省科技攻关项目(批准号:20130313006-3)和山西省研究生创新项目(批准号:20133016)资助.

Surface Activity Properties of Chiral L-Lysine Based Gemini Surfactants

LIANG Ya-Qin1,2, HU Zhi-Yong1, CAO Duan-Lin1, LIANG Dong1   

  1. 1. School of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China;
    2. Department of Chemistry, Changzhi College, Changzhi 046011, China
  • Received:2013-07-29 Online:2013-12-10 Published:2013-09-29

摘要:

用表面张力法、电导法和稳态荧光法研究了手性Gemini表面活性剂[C12-m-C12] Na2m=2,4,6)和[C12-T-C12] Na2的表面性能及临界胶束聚集数,并计算胶束形成的热力学参数,用圆二色谱法考察了[C12-2-C12] Na2在不同浓度下的立体构型. 结果表明,手性Gemini表面活性剂的临界胶束浓度(cmc)和临界表面张力γcmc随着连接基链长增加或刚性增强而增大;ΔGm0和ΔHm0为负值,|ΔHm0|比|-TΔSm0|小很多,说明胶束化过程为熵驱动的自发放热过程;随着连接基链长增加或刚性增强,ΔGm0和ΔHm0逐渐增大,ΔSm0和临界胶束聚集数逐渐减小,表明其胶束化能力随之降低;当浓度大于cmc时,手性Gemini表面活性剂可形成手性超分子聚集体.

关键词: 手性, Gemini表面活性剂, L-赖氨酸, 胶束聚集数, 胶束形成的热力学参数

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), γcmc and per surfactant molecule(Amin) 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 Γmax. The results show that the surface activites of [C12-m-C12] Na2 and [C12-T-C12] Na2 are high. ΔGm0 and ΔHm0 are negative, the absolute value of ΔHm0 is much smaller than the product of ΔSm0 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, ΔGm0 and ΔHm0 of the surfactants increase, ΔSm0 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

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