阴/阳离子表面活性剂复配形成有序聚集体的流变特征及分子动力学模拟研究

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• 英文论文题名：Rheological Characterizations and Molecular Dynamics Simulations of the Aggregation in Anionic-cationic Surfactant Composite System
• 论文作者：严志虎 ; 戴彩丽 ; 赵明伟
• 英文论文作者：Zhihu Yan ; Caili Dai ; Mingwei Zhao ; School of Petroleum Engineering ; China University of Petroleum (East China)
• 年：2016
• 作者机构：中国石油大学(华东)石油工程学院;
• 论文关键词：阴/阳离子表面活性剂 ; 复配 ; 蠕虫状胶束 ; 分子动力学模拟
• 会议召开时间：2016-07-01
• 会议录名称：中国化学会第30届学术年会摘要集-第三十一分会：胶体与界面化学
• 语种：中文
• 分类号：O647.2
• 学会代码：ZGHY
• 会议名称：中国化学会第30届学术年会-第三十一分会 ; 胶体与界面化学
• 会议地点：中国辽宁大连
• 主办单位：中国化学会
• 学会名称：中国化学会
• 页数：1
• 文件大小：210k
• 原文格式：D
• 会议级别：全国

摘要

当表面活性剂在水溶液中达到一定浓度时,会发生自组装形成胶束、囊泡、溶致液晶以及微乳液等多种形态和功能各异的聚集体。与单一表面活性剂相比,阴/阳离子表面活性剂复配能够发生协同作用,从而具有更优越的界面性质、更高的表面活性、更低的临界胶束浓度等,因而成为研究的热点。本文合成了一种新颖的N-脂酰氨基酸阴离子表面活性剂(1602),并研究了其与阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)复配体系在不同摩尔比例下(R=C_(1602)/C_(CTAB))的理化性质、聚集行为、流变特征,并利用分子动力学模拟研究了复配体系中形成有序聚集体的聚集过程。研究发现:(1)与单一表面活性剂体系相比,复配体系具有更低的cmc值和更高的表面活性;(2)当R=0.5时,复配体系中形成的蠕虫状胶束体系粘弹性最佳,说明该比例下体系形成了最紧密的网络状结构;(3)蠕虫状网络经历了从球形球形聚并?短棒状(?)长棒状(?)棒形聚并三维空间网络的形成过程。
When the surfactant reaches a certain concentration in the aqueous solution,a variety of aggregates with unique features and properties such as micelles,vesicles,lyotropic liquid crystal,micro-emulsion,etc.can be formed.Compared with the single surfactant,anionic/cationic surfactant compound can act synergistically,thereby having superior interfacial properties,higher surface activity and lower critical micelle concentration.In this article,a new kind of anionic surfactant was synthesized.Physical and chemical properties,aggregation behaviors and rheological characteristics of composite system composed of anionic surfactant and cationic surfactant CTAB were examined.In addition,molecular dynamics simulations were employed to study the process of aggregation.Result showed that:(1) Compare with individual surfactant,the composite system has a much lower cmc value and higher surface activity;(2) When R = 0.5,wormlike micelles with the best viscoelastic properties and the strongest network-like structure are formed in composite system;(3) the dynamic formation step of wormlike micelles are: "sphere" fusion, "sphere to sphere" fusion,and "rod to sphere" fusion.

引文

[1]郭荣.我国胶体与界面化学的发展[J].化学通报,2012,75(1):6-14.
    [2]Haiqing Y,Zukang Z,Jianbin H,et al.Temperature-induced micelle to vesicle transition in the sodium dodecylsulfate/dodecyltriethylammonium bromide system.[J].Angewandte Chemie International Edition,2003,42(19):2188-91.