物理化学学报2011，Vol.27Issue(7)：1725-1729,5.
离子液体[EMIM][PF6]负载纳米SiOx表面的熔点及结构
Melting Point and Structure of Ionic Liquid [EMIM][PF6] on the Surface of Nano-SiOx Particles
摘要
Abstract
The 1-ethyl-3-methyl imidazolium hexafluorophosphate ionic liquid ([EMIM] [PF6]) was absorbed onto the surfaces of several kinds of nano-SiOx particles by mechanical grinding using an agate mortar.The samples were investigated by differential scanning calorimetry (DSC), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD). We found that the melting point of the [EMIM][PF6] adsorbed on the surface of nano-SiOx was significantly less than that of the bulk ionic liquid.For the pure ionic liquid [EMIM][PF6], the melting point was 62 ℃. After absorption onto SiOx nanoparticles the melting point decreased to 52 ℃ and △T was -10 ℃. For the other two types of nano-SiOx particles the △T was-20 and-17 ℃, respectively. These results indicate that the melting point depression was dependent on the surface properties of the nano-SiOx particles. Furthermore, the characteristics of the surface-adsorbed ionic liquid were also found to be quite different from that of the bulk ionic liquid by Raman and XRD analyses. The difference in the density of the surface hydroxyl groups and the specific surface area of the nano-SiOx particles may induce different interfacial interactions between [EMIM][PF6]and the nano-SiOx particles. Our results suggest that the density of the surface hydroxyl groups and specific surface area are the major factors responsible for the behavior of the adsorbed ionic liquid [EMIM][PF6].关键词
纳米SiOx/离子液体/熔点/相变Key words
Nano-SiOx/ Ionic liquid/ Melting point/ Phase transition分类
化学化工引用本文复制引用
刘玉胜,付海英,唐忠锋,黄卫,吴国忠..离子液体[EMIM][PF6]负载纳米SiOx表面的熔点及结构[J].物理化学学报,2011,27(7):1725-1729,5.基金项目
国家自然科学基金(11079007,20973192)资助项目 （11079007,20973192）
