Department of Chemical and Bioengineering, Reaction Engineering, University Erlangen-Nuremberg, Egerlandstrasse 3, 91058 Erlangen, Germany.
Chemphyschem. 2011 Dec 23;12(18):3539-46. doi: 10.1002/cphc.201100379. Epub 2011 Nov 8.
The influence of confinement on the ionic liquid crystal (ILC) [C(18)C(1)Im][OTf] is studied using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The ILC studied is supported on Si-based powders and glasses with pore sizes ranging from 11 to 50 nm. The temperature of the solid-to-liquid-crystalline phase transition seems mostly unaffected by the confinement, whereas the temperature of the liquid-crystalline-to-liquid phase transition is depressed for smaller pore sizes. A contact layer with a thickness in the order of 2 nm is identified. The contact layer exhibits a phase transition at a temperature 30 K lower than the solid-to-liquid-crystalline phase transition observed for the neat ILC. For applications within the "supported ionic liquid phase (SILP)" concept, the experiments show that in pores of diameter 50 nm a pore filling of α>0.4 is sufficient to reproduce the phase transitions of the neat ILC.
采用差示扫描量热法（DSC）、偏光显微镜（POM）和漫反射红外傅里叶变换光谱（DRIFTS）研究了 confinement 对离子液晶（ILC）[C（18）C（1）Im][OTf]的影响。所研究的 ILC 负载在孔径为 11 至 50nm 的基于硅的粉末和玻璃上。固态到液晶相转变的温度似乎受 confinement 的影响不大，而较小的孔径会降低液晶相到液相的转变温度。确定了厚度约为 2nm 的接触层。接触层在比纯 ILC 观察到的固态到液晶相转变低 30K 的温度下发生相变。对于“负载离子液相（SILP）”概念内的应用，实验表明在直径为 50nm 的孔中，填充度α>0.4 足以重现纯 ILC 的相变。
