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Interaction in Binary Mixtures of Gemini Surfactant G12-6-12 and CTAB by NMR
Jin-zhi Zhang*,Li Xie,Shi-gan Chai,Qi-chao Zou
Author NameAffiliationE-mail
Jin-zhi Zhang* Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China zjz4000@126.com 
Li Xie Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China  
Shi-gan Chai Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China  
Qi-chao Zou Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China  
Abstract:
The interaction between N'N0-bis(dimethyldodecyl)-1,6-hexanediammoniumdibromide (G12-6-12) and cetyltrimethylammonium bromide (CTAB) in D2O aqueous medium has been investigated by NMR at 298 K. The measured critical micelle concentration (cmc) of G12-6-12 and CTAB are about 0.773 and 0.668 mmol/L, respectively. The cmc* (cmc of mixture) values are less than CMC* (cmc of ideally mixed solution) in the mixed system, and the interaction parameter βM<0 at different molar fractions α of G12-6-12 in the mixed systems, but just when α≤0.3, cmc* values are much smaller than CMC*, and βM satisfies the relation of |βM|>|ln(cmc1=cmc2)|(cmc1: cmc of pure G12-6-12 and cmc2: cmc of pure CTAB). The results indicate that there exists synergism between G12-6-12 and CTAB, and they can form mixed micelles, which is further proven by 2D NOESY and self-diffusion co-efficient D experiments. There are intermolecular cross peaks between G12-6-12 and CTAB in 2D NOESY, and the radius of micelles in mixed solution is bigger than that in G12-6-12 pure solution in D experiments, indicating there are mixed micelles. However, when α>0.3, we find that cmc*≈CMC*, βM≈0, obviously, the two surfactants are almost ideal mixing fitting the pseudo-phase separation model and regular solution theory.
Key words:  Interaction, Gemini surfactant, Cetyltrimethylammonium bromide, NMR
FundProject:
二元混合体系Gemini表面活性剂G12-6-12和CTAB相互作用的NMR研究
张金枝*,谢丽,柴仕淦,邹其超
摘要:
运用NMR方法探讨了298 K时N,N'-双(十二烷基二甲基)-1,6-己烷溴化铵(G12-6-12)和十六烷基三甲基溴化铵(CTAB)在D2O溶液中的相互作用. 测得G12-6-12和CTAB的临界胶束浓度cmc值分别约为0.773和0.668 mmol/L. 在不同G12-6-12摩尔分数下,混合体系的临界胶束浓度实验值cmc*小于理想值CMC*,相互作用参数βM<0,但是当α≤0.3时,cmc*比CMC*小很多,同时 满足|βM|>ln(cmc1/cmc2)条件. 表明G12-6-12和CTAB之间存在协同效应,可以形成混合胶束,在2D NOESY谱中可以看到G12-6-12与CTAB分子间的交叉峰,扩散实验也表明混合溶液中的胶束半径比纯溶液中的G12-6-12胶束半径大,都预示混合胶束的形成. 当α>0.3 时,cmc*≈CMC*,βM≈0, 根据假相分离模型和规则溶液理论,G12-6-12和CTAB近似于理想混合.
关键词:  相互作用,Gemini表面活性剂,CTAB,NMR
DOI:10.1063/1674-0068/27/03/307-314
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