1.离子液体在其他溶剂中的扩散系数7. 五种1-乙基-3-甲基咪唑型离子液体在水溶液中无限稀释,温度范围303.2-323.2K下的扩散系数Taylor dispersion method9. 甲醇/[BMIM][PF6]体系中,25℃下不同[BMIM][PF6]浓度的相互扩散系数42. [C4C1im]BF4, [C4C1im][N(OTf)2],[C4C1im]PF6三种离子液体在甲醇,CH2Cl2中的扩散系数2.其他物质在离子液体中的扩散系数2.1 具有氧化还原活性的分子在离子液体中的扩散系数5. 水在离子液体[BMIM][TFSI] 中的反常扩散6. 三碘化物在混合离子液体中的扩散系数MPII,EMIC,EMIDCA,EMIBF4,EMINTf2 14. CO,DPA,DPCP在不同离子液体中的扩散系数17.CO2在离子液体中的扩散系数41.气体在[BMIM][PF6]中的扩散系数和离子液体的自扩散系数20. 气体在五种鏻型离子液体中的扩散系数21. 25℃下三碘化物在两种离子液体混合物中的扩散系数43 1,1,1,2-tetrafluoroethane (R-134a)在七种离子液体中的扩散系数3.离子液体的自扩散系数3.1 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) 和LiBF4混合Li BF4六种不同浓度下离子的自扩散系数3. EMIBF4,EMITFSI,BPBF4,BPTFSI中阳离子和阴离子的自扩散系数4. 咪唑型离子液体分子动力学模拟自扩散8. [BMIM][PF6] (自制和购买两种)在不同温度下的自扩散系数10. 胍基型离子液体的自扩散研究模型11. [bmim][PF6]的分子动力学研究12.N-methyl-N-propyl-pyrrolidinium bis-(trifluoromethanesulfonyl)imide (PYR13TFSI)和LiTFSI混合体系中不同温度和组成下离子的自扩散系数13.(1− x)(BMITFSI), x LiTFSI x<0.415. 质子传递的离子液体的自扩散系数16. DEME-TFSA和DEME-TFSA-Li 的自扩散系数18 用pulsed field gradient NMR测离子液体和离子液体混合物的传递性质41.气体在[BMIM][PF6]中的扩散系数和离子液体的自扩散系数25. 离子液体不同侧链长度对扩散的影响1. 离子液体在其他溶剂中的扩散系数2. 其他物质在离子液体中的扩散系数2.1 具有氧化还原活性的分子在离子液体中的扩散系数离子液体1-butyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)amide [BMIM][TFSI] butyltriethylammonium bis(trifluoromethylsulfonyl)amide) [Et3BuN][TFSI]N-methyl-N-butylpyrrolidinium bis{(trifluoromethyl)sulfonyl}-amide [Pyr][TFSI]被测的氧化还原对Dodzi Zigah, Jalal Ghilane, Corinne Lagrost, and Philippe Hapiot .Variations of diffusion coefficients of redox active molecules in room temperature ionic liquids upon electron transfer. J. Phys. Chem. B, 2008, 112 (47), 14952-149583. 离子液体的自扩散系数3.1 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) 和LiBF4混合Li BF4六种不同浓度下离子的自扩散系数Fig.1 Arrhenius plots of the self-diffusion coefficients for (a) Li, (b) BF4, and (c) [emim].在[emim][BF4]中,尽管[emim]分子大小比[BF4]大,但是[emim]扩散比[BF4]稍微快一点,说明[BF4]不是以单个离子扩散的。
在[Li][emim][BF4]二元体系中,[emim]扩散最快,然后是BF4,Li最慢。
最小的离子尺寸扩散最慢。
Hayamizu K, Aihara Y, Nakagawa H, Nukuda T, Price WS. Ionic conduction and ion diffusion in binary room-temperature ionic liquids composed of [emim][BF4] and LiBF4. JOURNAL OF PHYSICAL CHEMISTRY B,108(2004):19527-195323. EMIBF4,EMITFSI,BPBF4,BPTFSI中阳离子和阴离子的自扩散系数1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4)1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI)1-butylpyridinium tetrafluoroborate (BPBF4)1-butylpyridinium bis(trifluoromethylsulfonyl)imide (BPTFSI)N.A.Stolwijk ,Sh.Obeidi. Combined analysis of self-diffusion, conductivity, and viscosity data on room temperature ionic liquids. Electrochimica Acta,54(2009),1645-16535. 咪唑型离子液体分子动力学模拟自扩散1- alkyl-3-methylimidazolium [amim](+) (alkyl=methyl, ethyl, propyl, and butyl) family with PF6-, NO3-, and Cl- counterions模拟结果First citation in article扩散系数的变化趋势:对于相同阴离子,[emim]+>[pmim]+>[bmim]+,对于相同阳离子,[NO3]−>[PF6]−>[Cl]−。
[dmim]+因为结构对称并且在液相中排列得好(its symmetric structure and good packing in the liquid phase),扩散系数相对小。
决定自扩散大小的主要因素是离子液体阴离子的几何形状,其他因素包括离子大小和阴离子电荷移位。
M. H. Kowsari,Saman Alavi,Mahmud Ashrafizaadeh,and Bijan Najafi. Molecular dynamics simulation of imidazolium-based ionic liquids. I. Dynamics and diffusion coefficient. J. Chem. Phys. 129 (2008)5. 水在离子液体[BMIM][TFSI] 中的反常扩散[BMIM][TFSI] + water 体系中BMIM, TFSI, 和H2O的自扩散系数butyl-methyl-imidazolium bis(trifluoromethylsulfonyl)-imide ([BMIM][TFSI])Table 1: Self-Diffusion Coefficients of BMIM, TFSI, and H2Owater does not induce a significant increase of the ion pair dissociation but disturbs the RTIL cohesion. Moreover, whereas very similar evolutions are observed for anion and cation (increase of 30%), in the same range of water molar fraction the increase of D water is 25 times greater. It indicates that miscibility of water is not complete at the microscale and that the [BMIM][TFSI] + water system shows a partial segregation between [BMIM][TFSI] + some water molecules phase and water + some [BMIM][TFSI] ions phase.Anne-Laure Rollet, Patrice Porion, Michel V aultier, Isabelle Billard, Michael Deschamps, Catherine Bessada, and Laurence Jouvensal. Anomalous Diffusion of Water in [BMIM][TFSI] Room-Temperature Ionic Liquid. J. Phys. Chem. B, 2007, 111 (41), 11888–118916. 三碘化物在混合离子液体中的扩散系数MPII,EMIC,EMIDCA,EMIBF4,EMINTf21-Methyl-3-propylimidazolium iodide (MPII)1-Ethyl-3-methylimidazolium chloride (EMIC)1-Ethyl-3-methylimidazolium dicyanamide (EMIDCA)1-Ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4)1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(EMINTf2)The determined triiodide diffusion coefficients for the three systems with 0.05 mol L_1iodine and varying MPII concentration in an IL based electrolyte are in a range from 1.22×10-7cm2·s-1 for MPII up to 8.30×10-7 cm2·s_1for 91 mol% EMIDCA, 3.61×10_7cm2·s_1for 90mol% EMIBF4 and 4.07×10_7cm2·s_1for 90mol% EMINTf2.Phillipp Wachter, Christian Schreiner, Markus Zistler, Dirk Gerhard, Peter Wasserscheid, Heiner J. Gores. A microelectrode study of triiodide diffusion coefficients in mixtures of room temperature ionic liquids, useful for dye-sensitised solar cells. Microchim Acta (2008) 160: 125–1337. 五种1-乙基-3-甲基咪唑型离子液体在水溶液中无限稀释,温度范围303.2-323.2K下的扩散系数Taylor dispersion method[Emim][C2N3 (dicyanamide)],[Emim][BF4 (tetrafluoroborate)],[Emim][C2H5SO4 (ethylsulfate)], [Emim][CF3SO3 (trifluoromethanesulfonate)], [Emim][MDEGSO4 (2-(2-methoxyethoxy) ethylsulfate)]Chun-LiWong, Allan N. Soriano, Meng-Hui Li. Diffusion coefficients and molar conductivities in aqueous solutions of 1-ethyl-3-methylimidazolium-based ionic liquids. Fluid Phase Equilibria 271 (2008) 43–528. [BMIM][PF6] (自制和购买两种)在不同温度下的自扩散系数合成和购买的离子液体两个样品的自扩散系数有很大差异,说明很少量的杂质可以在很大程度上影响离子液体中的传递现象。