离子液体吸附性能的压电传感监测

Investigation of the Adsorption of an Ionic Liquid by a Piezoelectric Sensor

离子液体通常具有高粘性,其粘度是影响物质在离子液体中传质速率的重要因素之一,当离子液体吸附有机溶剂后或温度上升,其粘度显著下降。基于这一现象,采用对粘度有敏感响应的硅酸镧镓晶体微天平,实时检测1-甲基-3-正辛基咪唑四氟硼酸盐的粘度-温度曲线以及吸附四氯化碳蒸气过程中的吸附量动态变化,为研究离子液体粘度及吸附性能提供了一种新的测量方法。

The viscosity is one of the most important factors to influence the mass transfer in high viscouse room temperature ionic liquids.The viscosity of an ionic liquid is sensitive to the change in temperature as well as its component,which was monitored in real time by the motional resistance of a langasite crystal microbalance.It is shown that the viscosity of 1-octyl-3-methylimidazolium fluoroborate decreases as the temperature rises.After adsorption of CCl4 vapor,the viscosity of the mixture of ionic liquid and CCl4 decreases.The adsorbed amount of CCl4 onto the ionic liquid film was followed by the LCM from the changes in viscosity.The LCM method offers a simple and rapid way to measure the viscosity and the adsorbed amount of an ionic liquid.