研究了咪唑类离子液体[Cnmim]Br与传统阴离子表面活性剂SDS混合水溶液的性质,结果显示混合水溶液性质随咪唑阳离子上烷烃链长的变化而呈现出明显的不同。当离子液体取代烷基链的碳数大于或等于6时,混合体系可以自发地分为共存的两相,即双水相。共存的两相界面清晰、性能稳定且能有效萃取染料二甲酚橙,有望成为新型高效的分离体系,在生物活性物质的纯化、分离中发挥作用。混合体系中离子液体和传统表面活性剂相对含量的改变引起混合溶液中表面活性剂聚集体尺寸和形态的变化,最终导致双水相上、下两相表观现象的差异。此外,离子液体、SDS头基间库仑力作用、烷烃链的疏溶剂力以及离子液体与SDS的协同效应,是形成溶致液晶的重要驱动力,导致较低浓度下十字花纹理层状液晶（LC）的生成。

Properties of mixed aqueous solutions of ionic liquid（Br） and traditional surfactant（SDS） were studied.Results showed that the properties of the mixed systems varied with the chain length of substituted alkyl in ionic liquids.Only those systems containing ionic liquids with equal to or more than 6 carbon atoms in alkyl chains can form aqueous two phase system（ATPS）.The ATPS containing ionic liquids and surfactant has obvious extraction ability to xylenol orange and the potential to separate and purify biomaterials.The difference in appearance of ATPS should be attributed to the various size and shape of the surfactants aggregates formed in mixed solutions.Furthermore,the electrostatic attractive interaction,the hydrophobic interaction in addition to the synergistic effect between ionic liquids and SDS further promote the surfactant assembly,which leads to the formation of liquid crystal at lower surfactant concentration.

以表面活性剂十六烷基三甲基溴化铵(CTAB)为模板,钛酸四正丁酯为钛源,偏钒酸铵为掺杂离子前驱体,通过液晶模板辅助溶胶-凝胶法制备钒掺杂介孔TiO2(VMT),采用X射线衍射(XRD)、N2吸附-脱附分析、热重-差热分析(TG-DTA)、X射线光电子能谱(XPS)、紫外-可见光谱(UV-Vis)和透射电子显微镜(TEM)等对样品结构进行表征,选择亚甲基蓝为目标降解物,对VMT的可见光催化性能进行了研究.结果表明,钒掺杂减小了介孔TiO2(MT)的粒径和光生电子-空穴复合率,增大了比表面积及Ti3+和羟基浓度,导致VMT比纯MT和P25光催化活性高,并且钒掺杂使MT带隙能降低,使其具有很高的可见光催化活性.最佳的光催化条件为:VMT的浓度为0.83 g/L,MB的浓度为1 mg/L.

Based on employing the liquid crystal of surfactant cetyltrimethyl ammonium bromide ( CTAB ) , tetrabutyl titanate and ammonium metavanadate as template, titanium source and doping-ion precursor, respectively, vanadium-doped mesoporous titanium dioxide ( VMT ) was obtained by sol-gel method. The structure of obtained sample was characterized via X-ray diffraction(XRD), nitrogen adsorption-desorption, thermogravimetry-differential thermal analysis ( TG-DTA ) , X-ray photoelectron spectroscopy ( XPS ) , UV-Visible diffuse reflection spectrometry( UV-Vis) and transmission electronic microscopy( TEM) . Choosing methylene blue( MB) as the target degradation product, the photocatalytic performance of VMT was discussed under visible light irradiation. The results show that doping vanadium can reduce TiO2 particle size, inhibit photo-electron and hole recombination rate as well as increase specific surface area and the concentration of titanium ion and hydroxyl. Thus VMT exhibits the highest c