共查询到19条相似文献,搜索用时 93 毫秒
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合成了系列1-烷基-3-甲基咪唑四氟硼酸盐([C2-7mim]BF4)室温离子液体,并通过核磁氢谱、红外光谱、质谱等手段对其进行了结构表征。采用Wilhelmy白金板法在室温(25℃)测定了离子液体的表面张力,测试结果显示,随着1位氮上取代基碳链的增长,其表面张力γ呈现出下降的趋势,且变化范围较宽,如从[C2mim]BF4的表面张力值50.4 mJ/m2到[C7mim]BF4的36.1 mJ/m2。吸水性能测试结果表明,随着氮取代基碳链的增长,其饱和吸水量逐渐减少。 相似文献
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间苯二甲酸在[Emim]BF4-H2O溶液中的溶解度及介稳区 总被引:1,自引:0,他引:1
研究采用动态法测定了间苯二甲酸在离子液体(1-乙基-3-甲基咪唑四氟硼酸盐,[Emim]BF4)-水二元混合溶剂中的溶解度曲线和超溶解度曲线,并且采用经验方程、理想溶液模型及λh方程对溶解度数据进行了关联,经验方程和λh方程的关联结果较好。实验结果表明,间苯二甲酸在[Emim]BF4-H2O体系中的溶解度均随温度的升高而增大,且随二元混合溶剂中1-乙基-3-甲基咪唑四氟硼酸盐([Emim]BF4)含量的增加而增大。测得的超溶解度曲线与溶解度曲线基本平行,介稳区宽度均随温度的增加而变窄。 相似文献
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利用差示扫描量热仪(DSC)和偏光显微镜(POM)研究了聚乳酸/1-乙基乙基醚-3-甲基咪唑四氟硼酸盐(PLA/[EOEIM]BF4)共混物的等温结晶行为。由等温结晶动力学分析可知,[EOEIM]BF4含量不同时,共混物的Avrami指数n基本保持在2.5左右,表明[EOEIM]BF4对PLA的成核及生长机理影响不大。然而,共混物的半结晶时间t1/2随[EOEIM]BF4含量的增加而增大,说明[EOEIM]BF4的加入对PLA的结晶有阻碍作用,这可能是由于[EOEIM]BF4与PLA分子间的相互作用所造成的。X射线衍射测试结果表明,所有样品在120℃下等温结晶所得的晶型为α晶型。 相似文献
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采用无溶剂一锅法合成了1-丁基-3-甲基咪唑四氟硼酸盐离子液体([bmim]BF4),反应原料N-甲基咪唑、溴代正丁烷和四氟硼酸钾在水浴中搅拌反应3 h,收率为91.8%。然后以1-丁基-3-甲基咪唑四氟硼酸盐离子液体催化合成含溴1,3,4-噻二唑类化合物,反应条件为:反应温度95~100℃,反应时间2 h,收率为58.3%。用减压蒸馏的简单方法将离子液体分离出来。研究结果表明,用离子液体[bmim]BF4合成含溴1,3,4-噻二唑的方法比传统方法即用浓硫酸作催化剂的方法的收率高6.7%。 相似文献
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以N-甲基咪唑和1-溴代正丁烷为原料,两步合成法制备了离子液体[bmim]BF4。考察了反应时间、反应温度、原料配比对中间体1-丁基-3-甲基咪唑溴盐[bmim]Br收率的影响和离子交换时间和离子交换温度对目标产物[bmim]BF4产率的影响。结果表明:①合成中间体[bmim]Br的最佳条件为:反应温度65℃,反应时间16 h,N-甲基咪唑与1-溴代正丁烷的摩尔比为1∶1.1,产品收率可达94.8%;②合成离子液体的最佳条件为:反应温度65℃,反应时间24 h。 相似文献
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Electrodeposition of tin and antimony in 1-ethyl- 3-methylimidazolium tetrafluoroborate ionic liquid
Wenzhong Yang Hui Cang Yongming Tang Jintang Wang Yuanxiang Shi 《Journal of Applied Electrochemistry》2008,38(4):537-542
The electrodepositions of Sn(II) and Sb(III) were studied in the [EMIm]BF4 ionic liquid at ambient temperature. Linear sweep voltammetry (LSV) results indicated that the reductions of Sn(II) and Sb(III)
on Pt electrode are electrochemically irreversible. The diffusion coefficients of Sn(II) and Sb(III) in the ionic liquid electrolyte
were determined in terms of the LSV data. Tin and antimony ions form simpler Sn(II) chlorocomplex species and higher Sb(III)
chlorocomplexes, respectively present in the ionic liquid electrolyte. Energy dispersive X-ray spectroscopy (EDX) analysis
revealed that tin and antimony alloys can be electroplated in the ionic liquid electrolyte. 相似文献
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在298.15 K和常压下,测定了1-丁基-3-甲基咪唑四氟硼酸([Bmim]BF4)离子液体+甲醇体系的密度和黏度。由密度计算了体系的表观摩尔体积,并采用Redlich-Mayer方程关联了体系的表观摩尔体积与组成的关系,得到了[Bmim]BF4在甲醇中的标准偏摩尔体积。由Jones-Dole方程对体系的黏度随组成的变化进行了拟合,获得了[Bmim]BF4在甲醇中的黏度B系数。结果表明:[Bmim]BF4+甲醇体系的表观摩尔体积和黏度均随[Bmim]BF4浓度的增加而增加,[Bmim]BF4在甲醇中的标准偏摩尔体积和黏度B系数分别为155.72×10-6m3/mol和0.282 9。 相似文献
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Shu-I Hsiu 《Electrochimica acta》2006,51(13):2607-2613
Voltammetry at a glassy carbon electrode was used to study the electrochemical co-deposition of Pd-In from a chloride-rich 1-ethyl-3-methylimidazolium chloride/tetrafluoroborate air-stable room temperature ionic liquid at 120 °C. Deposition of Pd alone occurs prior to the overpotential deposition (OPD) of bulk In. However, underpotential deposition (UPD) of In on the deposited Pd was observed at the potential same as the deposition of Pd. The UPD of In on Pd was, however, limited by a slow charge transfer rate. Samples of Pd-In alloy coatings were prepared on nickel substrates and characterized by energy dispersive spectroscope (EDS), scanning electron microscope (SEM) and X-ray powder diffraction (XRD). The electrodeposited alloy composition was relatively independent on the deposition potential within the In UPD range. At more negative potentials where the OPD of Pd-In has reached mass-transport limited region, the alloy composition corresponds to the Pd(II)/In(III) composition in the plating bath. The Pd-In alloy coatings obtained by direct deposition of Pd and UPD of In on the deposited Pd appeared to be superior to the Pd-In alloys that were obtained via the co-deposition of Pd and bulk In at OPD potentials. 相似文献
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Seok Kim 《Electrochimica acta》2009,54(14):3775-1117
The effects of room-temperature molten salt addition on the micro-structure and electrochemical properties of composite electrolytes (CEs) based on poly(ethylene oxide) (PEO)/ethylene carbonate (EC)/LiBF4 were studied. Additional salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4), was found to influence the crystalline structure and heterogeneous morphology, resulting in changes to the ionic conductivity of the CE. The CE containing 0.2 mol of EMIBF4 showed a small crystallinity, 27.9%. These CEs showed the highest ion conductivity, 3.1 × 10−4 S/cm, five times higher than that of the pristine PEO/EC/LiBF4. This enhanced conductivity originated from the decreased crystallinity and improved ion transference due to a Lewis acid-base interaction. The CE containing 0.3 mol of EMIBF4 showed decreased conductivity due to the lower mobility, reflecting the high viscosity of the molten salt. 相似文献
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Isobaric vapor-liquid equilibrium for methanol+benzene+1-octyl-3-methylimidazolium tetrafluoroborate
Qunsheng Li Wei Zhu Yongquan Fu Magtuf Zuhir Lun Li Baohua Wang 《Korean Journal of Chemical Engineering》2012,29(7):941-945
Isobaric vapor-liquid equilibrium (VLE) data for {methanol (1)+benzene (2)+1-octyl-3-methylimidazolium tetrafluoroborate (3)} where 3 is an ionic liquid ([OMIM]+[BF4]?) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. The results showed that the ionic liquid studied can transfer the azeotropic point and eliminate the azeotropic phenomena when its concentration is up to x3=0.30. This means that [OMIM]+[BF4]? can be used as a promising entrainer in the application of extractive distillation. The measured ternary data were correlated using the NRTL model. 相似文献
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The density, viscosity, refractive index, heat capacity, heat of dilution, ionic conductivity, and electrochemical stability
of 1-butyl-3-methylimidazolium bromide ([bmim][Br]), 1-butyl-3-methylimidazolium iodide ([bmim][I]), and 1-butyl-3-methylimidazolium
tetrafluoroborate ([bmim][BF4]) were measured at room temperature or over a temperature range of 293.2 to 323.2 K. The density and refractive index values
of [bmim][I] appeared to be the highest among three ionic liquids (ILs). However, the experimental viscosity values of [bmim][Br]
were higher than those of [bmim][BF4], while the heat capacities and heats of dilution of [bmim][BF4] were higher than those of [bmim][Br]. The cyclic voltammogram of [bmim][br] and [bmim][BF4] indicated electrochemical windows in the stability range from 2.7 V of [bmim][[Br] to 4.7 V of [bmim][BF4]. 相似文献
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The ionic liquid l-butyl-3-methylimidazolium tetrafluoroborate is used as electrolyte in the electrochemical determination of the diffusion coefficient of ferrocene as a function of concentration by cyclic voltammetry and chronoamperometry. An improved synthesis of the room temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate is described, which yields a product of high purity suitable for electrochemical purposes. A qualitative color test is discussed which allows the simple detection of silver ion contaminations. The diffusion coefficient of ferrocene appears to be concentration dependent in the solvent chosen. 相似文献