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  • AC Electrochemical Stability of Ionic Liquids
  • 更新时间:2014-04-10;信息类型:SCI论文
  • AC electrochemical windows (AC EWs) of ILs were first investigated on Pt, glass carbon (GC), and Au electrodes with frequency ranging from 20 to 100 Hz. The result showed that the AC EW of ILs was much wider than the DC EWs, and the AC EW increased markedly with frequency and with electrode in the order of GC > Pt > Au. Moreover, AC CVs of ILs provide not only different AC EWs but also different current density under identical voltage that are both structure-dependent.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/152.html
  • On the performance of thermostable electrowetting agents
  • 更新时间:2014-04-10;信息类型:SCI论文
  • Electrowetting of ionic liquids (ILs) in different alkane ambient and at different temperatures were studied under different AC voltages. The performance of IL-based electrowetting at elevated temperatures and that at room temperature was compared. It turns out that the electrowetting of ILs at elevated temperatures resulted in faster response and lower operation voltage. Furthermore, the relationship between the structure of the ion and the contact angle change was specifically investigated and theoretically explained. Finally, the properties of IL-based electrowetting in different alkane ambient were studied. It was demonstrated that the long length of the alkyl chain guaranteed a smaller contact angle under the same applied voltage. All the experimental results showed attractive features involving wide operating temperatures and in particular high stability, fast response, and good reversibility at elevated temperatures. The performance of IL-based electrowetting could be further improved through an optimal choice of an ambient phase or a rational design and synthesis of ionic liquids.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/146.html
  • Electrically Switchable Capillarity of Ionic Liquids
  • 更新时间:2014-04-10;信息类型:SCI论文
  • Electrocapillarity is the basis of modern electrowetting. And room temperature ionic liquids, an increasingly important set of electrolytes and organic salts that are liquid at room temperature, are considered a novel class of electrowetting agents, because of non-significant vapor pressure, nonflammability, good thermal stability, and a wide useable temperature range. In this paper, a simple device has been fabricated to investigate the electrocapillarity of ionic liquids. It shows attractive features involving wide operating temperature and in particular high stability, fast response and good reversibility at high temperatures. Besides, electrocapillarity of ionic liquids is strongly dependent on power supply frequency. In particular, high frequency, stable, reversible and wide height of rise modulations were obtained. The phenomenon of ionic liquids-based electrocapillarity was found to be affected by the structure and physicochemical properties of ionic liquids such as density, surface tension, alkyl carbon chain length of cation, type of the anion, etc., and the efficiency could be further improved through optimal choice of ambient phase or rational design and synthesis of ionic liquids.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/145.html
  • Electrowetting based infrared lens using ionic liquids
  • 更新时间:2014-04-10;信息类型:SCI论文
  • We demonstrated an infrared variable focus ionic liquids lens using electrowetting, which could overcome the problems caused by use of water, e.g., evaporation and poor thermostability, while keeping good optical transparency in visible light and near-infrared region. Besides, the type of lens (convex or concave) could be tuned by applied voltage or refractive index of ILs used, and the transmittance was measured to exceed 90% over the spectrum of visible light and near-infrared. We believe this infrared variable focus ionic liquids lens has a great application prospect in both visible light and infrared image systems.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/144.html
  • Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
  • 更新时间:2014-04-10;信息类型:SCI论文
  • A series of new ionic liquids, based on dialkoxy-functionalized quaternary ammonium cations {side chains: 1 = CH3, 1O1 = CH3OCH2, 1O2 =CH3OC2H4, 2O2 = C2H5OC2H4; cations: [N11,1O1,1O2], [N11,1O1,2O2], [N11,1O2,1O2], [N11,1O2,2O2] and [N11,2O2,2O2]}, with BF4 , (CF3SO2)2N (NTf2) and CH3CO2  (OAc) as counteranions, have been prepared and characterized. Their basic properties, such as spectroscopic characteristics, melting point, glass transition temperature, thermal stability, electrochemical window, density, refractive index, viscosity and conductivity, were measured and comparatively studied. The incorporation of two flexible alkoxy chains makes the quaternary ammonium salts highly qualified to be low-viscous and high-conductive room temperature ILs, and even some of them have significantly better fluidity than the popular imidazolium ILs with a similar molecular weight, e.g. [N11,1O1,2O2]BF4 (151 cP and 2.11 mS cm1, Mw: 249) vs. [HMIm]BF4 (220 cP and 1.2 mS cm1, Mw: 256) at 25 ℃. The electrochemical windows of these ILs were evaluated up to 5.5 V. In addition, the dialkoxy OAc ILs were found to have excellent solvent power for cellulose under mild conditions, e.g. a solution of 18 wt% microcrystalline cellulose in [N11,2O2,2O2]OAc at 80 ℃. By precipitation with water, the dissolved cellulose (I crystal structure) was regenerated as nanosized cellulose II particles with increased surface area and decreased crystallinity, determined by FE-SEM and XRD.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/143.html
  • “新型离子液体电解液”项目通过科技成果鉴定
  • 更新时间:2014-04-10;信息类型:国内研究进展
  • 1月22日,由中国科学院过程工程研究所“离子液体清洁过程与节能创新团队”为主研发完成的“新型离子液体电解液的研发及在锂离子电池中的应用”项目,顺利通过了中国科学院组织的科技成果鉴定。鉴定委员会一致认为:该项目形成了具有自主知识产权的新型离子液体电解液技术,建立了离子液体电解液规模化制备技术及成套设备,达到国际领先水平,具有良好的推广应用前景。
  • 链接地址:http://www.ionicliquid.org/research/2014-04-24/168.html
  • Facile electropolymerized-PANI as counter electrode for low cost dye-sensitized solar cell
  • 更新时间:2014-04-10;信息类型:SCI论文
  • The in situ electropolymerized-polyaniline (PANI) film (thickness: 5–20 l m) on FTO (fluorine tin oxide) glass doped by various counterions SO2-4, ClO-4 ,BF-4,Cl-, p-toluenesulfonate (TsO-), etc. was prepared with electropolymerized charge capacity of 50–600 mC cm-2. Different doping counterions have great impact on the morphology, electrochemical activity of electropolymerized-PANI film. The electropoly-merized-PANI doped by SO24 anion (PANI-SO4) film with much porous morphology and pore size diam-eter of several micrometers possesses higher reduction current for reduction of I-3 and a low charge-transfer resistance of 1.3 Ω cm2 in comparison with Pt as counter electrode (CE). Dye-sensitized solar cell with PANI-SO4 as CE was assembled, and the device under full sunlight illumination (100 mW cm-2,AM1.5 G) shows 5.6% photovoltaic conversion efficiency, which is comparable to 6.0% of that with Pt CE under the same experimental condition.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/117.html
  • Novel Cyclic Sulfonium-Based Ionic Liquids: Synthesis, Characterization, and Physicochemical Properties
  • 更新时间:2014-04-09;信息类型:SCI论文
  • A new series of ionic liquids composed of three cyclic sulfonium cations and four anions has been synthesized and characterized. Their physicochemical properties, including their spectroscopic characteristics, ion cluster behavior, surface properties, phase transitions, thermal stability, density, viscosity, refractive index, tribological properties, ion conductivity, and electrochemical window have been comprehensively studied. Eight of these salts are liquids at room temperature, at which some salts based on [NO3] and [NTf2] ions exhibit organic plastic crystal behaviors, and all the saccharinbased salts display relatively high refractive indices (1.442–1.594). In addition, some ionic liquids with the [NTf2] ion exhibit peculiar spectroscopic characteristics in FTIR and UV/Vis regions, whilst those salts based on the [DCA] ion show lower viscosities (34.2–62.6 mPas at 20℃) and much higher conductivities (7.6–17.6 mScm-1 at 20℃) than most traditional 1,3-di-ACHTUNGTRENUNGalkylimidazolium salts.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-09/112.html
  • Environmentally friendly and effective removal of Br and Cl- impurities in hydrophilic ionic liquids by electrolysis and reaction
  • 更新时间:2014-04-09;信息类型:SCI论文
  • Environmentally friendly and effective removal of Br and Cl impurities in hydrophilic dialkylimdazolium or butylpyridinium ionic liquids was investigated and developed at room temperature to 80 C and atomspheric pressure. Constant elelctrolysis was applied to oxidize Br and Cl to their corresponding Br2 and Cl2, then the BF 4 and NO 3 ions from HBF4 and HNO3 solution in the cathode zone move to anode zone through an anion exchange membrane and combine with dialkylimdazolium or butylpyridinium cation to form ionic liquids. The Br2 and Cl2 in electrolyzed ionic liquids are treated with ethylene to afford the corresponding 1,2-dibromo (or dichloro) ethane which could easily be removed by volatilisation under vacuum (ca. 10 mm Hg). Removal of Br and Cl impurities (0.94–4.47 wt%) from hydrophilic dialkyl imdazolium or butylpyridinium ionic liquids through electrolysis and ethylene treatment could be achieved at 0.06%–0.29% without any additional solvents and ionic liquid loss.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-09/95.html