Ionic liquids as stable solvents for ionic polymer transducers
Ionic liquids as stable solvents for ionic polymer transducers
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DOI：
10.1016/j.sna.2004.03.043
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发表时间：
2004-09-15
影响因子：
4.6
通讯作者：
Leo, DJ
中科院分区：
文献类型：
--
作者：
Bennett, MD;Leo, DJ
众所周知，National(TM)膜可用作机电执行器和传感器。材料中的转换是由于可移动阳离子在材料中的重新分布引起的，这是因为材料中充满了溶剂。通常，使用的溶剂是水，尽管它的使用限制了这些材料的性能。这是由于在相对较低的操作电压下水的化学分解，以及当这些设备在空气中操作时水因蒸发而损失，从而导致相应的性能损失。在目前的工作中，探索了使用高度稳定的离子液体来代替水。离子液体具有比水更大的电化学稳定性的优势，因此为这些材料提供了更高的驱动电压的可能性。此外，众所周知，离子液体是不挥发的，因此不会像水那样从聚合物中蒸发出来。在这项工作中，使用1-乙基-3-甲基咪唑三氟甲磺酸离子液体作为Nation(TM)聚合物致动器和传感器的可行溶剂。这种离子液体在-9℃熔化，电化学稳定窗口为4.1V[Inorg.化学。35(1996)1168]，使其成为离子聚合物换能器中有希望取代水的候选材料。实验结果表明，与用水溶解的相同材料相比，用该离子液体溶解的Nafion(TM)换能器在空气中工作时具有更好的稳定性，但与高频下的水样品相比，其响应幅度有所降低。与使用离子液体相关的主要缺点是与水相比反应速度降低，尽管初步结果是有希望的，并证明了这种方法的潜力。(C)2004爱思唯尔B.V.保留所有权利。
Nation(TM) membranes are known to operate as electromechanical actuators and sensors. The transduction in the material is caused by redistribution of the mobile cations in the material, which is made possible because the material is saturated with a solvent. Typically, the solvent used is water, although its use limits the performance of these materials. This is due to the chemical breakdown of the water at relatively low operating voltages and the loss of the water to evaporation when these devices are operated in air, causing a corresponding loss of performance. In the current work, the use of highly stable ionic liquids to replace water is explored. Ionic liquids have the advantage of greater electrochemical stability than water, thus offering the possibility of higher actuation voltages for these materials. Also, ionic liquids are known to be non-volatile and therefore will not evaporate out of the polymer as water will. In this work, the use of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid is demonstrated as a viable solvent for Nation(TM) polymer actuators and sensors. This ionic liquid melts at -9degreesC and has an electrochemical stability Window of 4.1 V [Inorg. Chem. 35 (1996) 1168], making it a promising candidate to replace water in ionic polymer transducers. Experimental results indicate that Nafion(TM) transducers solvated with this ionic liquid have improved staility when operated in air as compared to the same materials solvated with water, although the magnitude of the response is decreased as compared to the water samples at high frequencies. The main drawback associated with the use of ionic liquids is a reduction in the speed of the response as compared to water, although the initial results are promising and demonstrate the potential for this approach. (C) 2004 Elsevier B.V. All rights reserved.