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          您當前的位置:首頁 > TAG信息列表 > 離子液體性能研究

          • 離子液體-性質、制備與應用
          • 更新時間:2014-04-11;信息類型:專著
          • 本書比較系統地介紹了離子液體的性質、制備和應用。全書共分7章,包括離子液體的定義和發展歷史;分類和制備;物理化學和結構性質;離子液體在有機合成、 催化、分離分析和電化學領域中的應用等。本書涵蓋了2005年10月以前國內外有關離子液體的最新研究成果,內容豐富翔實。 本書可供化學、化工、材料及相關學科領域從事研究開發、生產的科技與管理人員,以及高等院校師生閱讀參考。
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-11/317.html
          • 一種光響應的離子液體及其制備方法
          • 更新時間:2014-04-11;信息類型:發明專利
          • 本發明公開了一種光響應的離子液體及其制備方法。離子液體的結構具有如下通式,該離子液體含有光響應的偶氮苯基團,在溶液和純液態情況下均可保持良好的光 致變色(異構)性能,在光的作用下能實現離子液體的物理化學性質例如紫外可見吸收光譜、熒光發射光譜和電導率的可逆變化,可以作為一種優良的信息存儲材 料、光開關分子器件、導電的光致變色(異構)材料和光敏感材料。
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-11/308.html
          • Benzonitrile as a Probe of Local Environment in Ionic Liquids
          • 更新時間:2014-04-10;信息類型:SCI論文
          • Because of its sensitivity to chemical and electrostatic characteristics, nitrile group as an infrared (IR) probe to monitor the local structure, folding kinetics, and electrostatic environment of protein, or solvation of molecular solvents, has attracted increasing attention. Herein, by choosing benzonitrile and imidazolium ionic liquids (ILs) as the IR probe and model ILs, respectively, we report that the nitrile stretching vibration (νCN) could be utilized as a simple and substantial IR probe to monitor the local environment of ILs such as hydrogen bonding (H-bonding) as well as intrinsic electric field. In 1-alkyl-3-methylimidazolium-based non-hydroxyl ILs, the νCN is in a “free” state, and is less affected by the alkyl chain, while it significantly decreases with the effective anion charge. In 1-(2-hydroxyethyl)-3-methylimidazolium-based hydroxyl ILs, however, a distinct anion-dependent νCN forming H-bonding with the hydroxyl is also observed besides the “free” νCN band. The “free” component of νCN can be further employed to determine the intrinsic electric field in both non-hydroxyl (directly) and hydroxyl (indirectly by subtracting H-bonding contribution) ILs by using vibrational Stark effect. Moreover, the result suggests that benzonitrile is preferentially located in the charge domain in ILs and it could be a more suitable probe to report the ionic network rather than the nonpolar domain in ILs.
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-10/174.html
          • Distinct influence of the anion and ether group on the polarity of ammonium and imidazolium ionic liquids
          • 更新時間:2014-04-10;信息類型:SCI論文
          • The polarity of ionic liquids (ILs), usually denoted as ET(30) by the solvatochromic probe Reichardt’s dye, is one of the most fundamental properties that remarkably affect the solvation and chemical reaction in ILs. It was generally accepted that the ET(30) of ILs was dominated by the nature of the cation. However, in this work, it was found that the common ammonium-based ILs showed strongly anion-dependent ET(30). For example, the ET(30) value for [N1124][DCA] and [N1124][NTf2] is 49.0 and 59.0 kcal mol 1, respectively, while the corresponding imidazolium ILs bearing the same anions possess nearly identical ET(30), the ET(30) value for [BMIm][DCA] and [BMIm][NTf2] is 51.4 and 51.6 kcal mol 1, respectively. Moreover, introduction of an ether group was found to increase the ET(30) of imidazolium ILs while having no obvious effect on that of ammonium-based ILs. The Kamlet–Taft parameters and density functional theory (DFT) calculations indicated that the distinct result is related to different stabilization of the ground state of Reichardt’s dye 30. In imidazolium ILs, the main interactions between ILs and zwitterionic dye involve both coulombic interaction (between the cation and the phenolate oxygen atom) and H-bonding interaction (between the acidic hydrogen on imidazolium ring and the phenolate oxygen atom). However, with the ammonium ILs lack of active hydrogen, the dye is only stabilized by the coulombic interaction between the cation and the phenolate oxygen atom. Interestingly, in both imidazolium and ammonium-based ILs, the spiropyran–merocyanine equilibrium exhibit obvious anion-dependent photochromism, solvatochromism, and thermal relaxation.
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-10/162.html
          • Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
          • 更新時間:2014-04-10;信息類型:SCI論文
          • 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.
          • 鏈接地址:http://www.abmbags.com/download/article/2014-04-10/143.html
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