反气相色谱法研究咪唑基三氟甲磺酸盐离子液体的表面性质  

Characterization of Surface Properties of Lmidazolium-based Trifluoromethanesulfonate Ionic Liquids by Inverse Gas Chromatography

作　　者：潘薪羽 赵丽 马空军 王强 PAN Xin-yu;ZHAO Li;MA Kong-jun;WANG Qiang(Center for Physical and Chemical Analysis ,Xinjiang University ,Urumqi 830046;Key Laboratory of Coal Cleaning Conversion and Chemical Engineering Process, Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University ,Urumqi 830046)

机构地区：[1]新疆大学理化测试中心,新疆乌鲁木齐830046 [2]新疆大学化学化工学院,煤炭清洁转化与化工过程自治区重点实验室,新疆乌鲁木齐830046

出　　处：《分析科学学报》2018年第2期191-195,共5页Journal of Analytical Science

基　　金：国家自然科学基金(No.21366029,21566036)

摘　　要：采用反气相色谱技术(IGC),研究了1-乙基-3-甲基咪唑三氟甲磺酸盐(EMIMOTF)、1-丁基-3-甲基咪唑三氟甲磺酸盐(BMIMOTF)、1-己基-3-甲基咪唑三氟甲磺酸盐(HMIMOTF)、1-辛基-3-甲基咪唑三氟甲磺酸盐(OMIMOTF)4种离子液体(ILs)表面的物理化学性质。结果表明,4种ILs色散分量均随着温度升高而降低,表面自由能变化与ILs色散分量相一致。4种ILs Lewis酸碱性均呈现Lewis两性偏碱性,Kb/Ka分别为3.857、3.716、3.632和3.332。The surface physicochemical properties of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 1-hexyl-3-methylimidazolium trifluoromethanesulfonate and 1-octyl-3-methylimidazolium trifluoromethanesulfonate were studied by means of inverse gas chromatography. The results showed that the dispersive component of surface free energy of the ionic liquids, as well as the total surface free energy decreased with temperature increasing. The Lewis acidic/ basic number Kb/Ka of the ILs are 3. 857,3. 716,3. 632,3. 332 ,respectively. The result indicates that the Lewis acidic/basic property ILs are amphoteric and more basic.

关 键 词：反气相色谱 离子液体 表面性质 表面色散自由能 Lewis酸碱性 

分 类 号：O657.71[理学—分析化学]