Physicochemical properties of imidazolium-derived ionic liquids with different C-2 substitutions
作者:Chen Liao、Nan Shao、Kee Sung Han、Xiao-Guang Sun、De-En Jiang、Edward W. Hagaman、Sheng Dai
DOI:10.1039/c1cp22375e
日期:——
functional groups at the C-2 position generally increased the viscosity and lowered the ionic conductivity. The introduction of an ether group (–CH2OCH2CH2CH2CH3) at the C-2 position not only enhanced the reduction stability of the ionic liquids but also exhibited the lowest solid electrolyte interfacial resistance (RSEI). In contrast, the introduction of a cyano group (–CN) at the C-2 position not only decreased
合成了五种基于C-2取代的咪唑鎓阳离子和双(三氟甲磺酰基)酰亚胺(TFSI)阴离子的室温离子液体,其理化性质为:热性质,密度,粘度,离子电导率,自扩散系数和电化学稳定性。系统地调查。这些离子液体的粘度和离子电导率对温度的依赖性可以通过Vogel-Fulcher-Tamman(VFT)方程来描述。与参比的1-丙基-3-甲基咪唑双(三氟甲磺酰基)酰亚胺相比,在C-2位置引入官能团通常会增加粘度并降低离子电导率。醚基(–CH 2 OCH 2 CH 2 CH在C-2位置的2 CH 3)不仅增强了离子液体的还原稳定性,而且表现出最低的固体电解质界面电阻( R SEI)。相反,在C-2位置引入氰基(–CN)不仅降低了还原稳定性,而且不利地提高了SEI抗性。C-2取代对还原稳定性的影响通过最低未占据分子轨道的能级变化来解释。通过脉冲场梯度核磁共振(PFG-NMR)测量每个离子的自扩散系数( D)。锂转移数(
A bicyclic imidazolium ionic liquid (4d), [b-4C-im][Br], was found to be highly effective not only for promoting PCR of GC-rich DNA by minimizing non-specific amplification, but also for facilitating PCR of normal-GC DNA under mild conditions.
parameters of the ILs were estimated. The trends of changing with temperature for the dynamic viscosity and the electrical conductivity were described by the Vogel–Fulcher–Tamman equation. The activation energies of dynamic viscosity and electrical conductivity were also calculated. Further, the structures and the energetics of the ILs ions were obtained through combining density functional theory calculations
制备了10种含有碳酸氢根、磷酸二氢根和硫酸氢根阴离子的烷基咪唑基非质子离子液体(AILs),并分别采用元素分析、红外光谱和质子核磁共振等方法对其进行了表征。测量了电导率、密度、动态粘度、表面张力等特性,并在环境条件下的各种温度范围内与热力学和经验方程相关联。估计了 IL 的一些重要的热力学参数。Vogel-Fulcher-Tamman 方程描述了动态粘度和电导率随温度变化的趋势。还计算了动态粘度和电导率的活化能。更远,ILs离子的结构和能量是通过结合密度泛函理论计算和COSMO-RS方法获得的。结构效应...
LCST-type liquid–liquid phase separation behaviour of poly(ethylene oxide) derivatives in an ionic liquid
We present a new series of polymerâionic liquid solutions exhibiting LCST-type liquidâliquid phase separation behaviour, and reveal their phase behaviour and intermolecular interactions based on phase diagrams and NMR analysis.
The present invention relates to fluidic systems for controlling one or more fluids and/or one or more reagents. These systems can be used in combination with one or more devices for assaying, processing, and/or storing samples. In particular, the systems and related methods can allow for dispensing fluid in a controlled manner and/or introducing pause(s) when implementing assays or processes.