Aggregation Behavior of Surface Active Dialkylimidazolium Ionic Liquids [C12C n im]Br (n = 1–4) in Aqueous Solutions
作者:Xuefeng Liu、Jie Hu、Yijun Huang、Yun Fang
DOI:10.1007/s11743-012-1409-1
日期:2013.7
fluorescence probe methods, respectively. It was found that elongation of the side chain length will bring about an enhancement of surface activity. Along with the side chain length increasing, the critical micelle concentration (CMC), surface tension at CMC (γCMC), the maximum surface excess (Γm), micellar aggregation number (Nm) and micellar microenvironment polarity of [C12Cnim]Br decrease, while adsorption
四种二烷基咪唑鎓离子液体,即具有相同十二烷基长链尾部(C 12)和短烷基侧链(C n,n = 1–的1-烷基-3-十二烷基咪唑鎓溴化物([C 12 C n im] Br)4)合成,并通过ESI-MS,1 H-NMR和元素分析确认了其分子结构。[C 12 C n im] Br(n= 1-4)分别通过表面张力和荧光探针法确定。发现侧链长度的延长将带来表面活性的增强。随着侧链长度的增加,临界胶束浓度(CMC),在CMC(表面张力γ CMC),最大表面过量(Γ米),胶束聚集数(Ñ米)和胶束微环境的极性[C的12 Ç ñ IM]溴减少,而吸附效率(p ç 20)中,在CMC(Π表面压力CMC),最小分子截面积(甲分钟)在空气解决方案接口处,并且CMC / C 20比率增加。