中文关键词:非离子表面活性剂离子液体 临界胶束浓度聚集数 粒径微粘性 英文关键词:Nonionicsurfactant, Ionicliquids, CriticalMicellization Concentration, Aggregationnumber, Particlesize, Micro-viscosity 基金项目:国家自然科学基金项目

作者	单位	E-mail
王冠石	华东理工大学化学与分子工程学院 上海 200237	15221046568@yeah.net
王小永	华东理工大学化学与分子工程学院 上海 200237	xiaoyong@ecust.edu.cn

摘要点击次数:2043 全文下载次数:0 中文摘要: 添加离子液体会对表面活性剂在水溶液中的聚集行为产生重要影响。本文研究了吐温-20在中低浓度离子液体[bmim][BF4]中的胶束化行为。随着[bmim][BF4]浓度(CIL)从0增加到0.2 mol·L?1，吐温-20的临界胶束浓度逐渐增大。相比CIL<0.05 mol·L?1，在CIL>0.05 mol·L?1时加入[bmim][BF4]使吐温-20 临界胶束浓度增大得更加显著。吐温-20胶束聚集数随着离子液体浓度的增加而逐渐减小，这一结果也说明加入离子液体会对吐温-20胶束的生成有抑制作用。吐温-20胶束化热力学研究表明吐温-20在不同浓度离子液体中的胶束化是熵、焓共同驱动，并具有熵-焓补偿性。随着离子液体浓度的增加，吐温-20胶束平均粒径和胶束微粘性均表现出先增大后减小的变化，在CIL=0.05 mol·L?1时达到最大值。这主要是因为缔合于吐温-20胶束栅栏层的离子液体带来的静电和空间斥力、离子液体与吐温-20之间的氢键作用、以及水分子对胶束的渗透性等因素综合作用的结果。 英文摘要: The presence of Ionic Liquids (ILs) has a significant impact on the aggregation behavior of surfactants in aqueous solution. In this article, micellization of non-ionic surfactant Tween-20 with the presence of middle and low concentration of hydrophilic ionic liquid [bmim][BF4] (1-butyl-3-methylimidazolium tetrafluoroborate) was investigated. Critical Micellization Concentration (CMC) of Tween-20 showed an upward trend with increasing concentration of [bmim][BF4] from 0 to 0.2 mol·L?1. When the concentration of IL exceeded 0.05 mol·L?1, [bmim][BF4] showed more remarkable effects on increasing CMC of Tween-20, compared with IL concentration lower than 0.05 mol·L?1. Aggregation number of Tween-20 micelles decreased with increasing concentration of [bmim][BF4], which also indicated that the presence of [bmim][BF4] had great effect on hindering the micellization of Tween-20. Thermodynamic investigation of Tween-20 micellization demonstrated that the micellization of Tween-20 was driven by both entropy and enthalpy, and also showed entropy-enthalpy compensation. Meanwhile, average particle size and micro-viscosity of Tween-20 micelles increased first and then decreased with increasing concentration of [bmim][BF4] from 0 to 0.2 mol·L?1, reaching peak values at CIL=0.05 mol·L?1. This result was attributed to the electrostatic and steric effects, hydrogen bond between ionic liquid and Tween-20 as well as the dramatically increased permeability of water molecules brought by the presence of [bmim][BF4] associated to the palisade layer of Tween-20 and the diminished aggregation number. 查看全文查看/发表评论下载PDF阅读器 相关附件：Cover LetterFig版权转让声明书Cover Letter -->