Measurement of diffusion coefficients of radical in silicon ionic liquids by transient grating method

离子液体具有各种有趣的特性，如蒸气压低、导电性高、化学稳定性好。由于这些独特的性能，液体溶剂可以克服有机溶剂的缺点，如高蒸气压和可燃性。因此，它作为锂离子电池的电解液受到了广泛的关注。然而，已知分子在IL中的扩散通常是缓慢的，因为IL的粘度高于有机溶剂。另一方面，据报道，分子在硅油中的扩散比在相同粘度的有机溶剂中要高。因此，我们期望硅氧烷官能团可以提高分子的扩散速度。本研究的目的是分析适用于电化学器件的硅离子液体的输运性质。我们采用瞬态光栅（TG）方法来确定硅质硅中的扩散系数。

Ionic liquids (ILs) have various interesting properties, for example, low vapor pressure, high electrical conductivity, chemical stability. Due to these unique properties, ILs can overcome the drawback of organic solvents such as high vapor pressure and flammability. Therefore it is attracted much attention as an electrolysis solution in Li ion battery. However it is known that molecular diffusion in IL is generally slow, because viscosities of ILs are higher than that of organic solvent. On the other hand, it has been reported that molecular diffusion in silicone oil is higher than that in organic solvents with the same viscosity. Therefore we expected that siloxane fanctional group may improve the rate of molecular diffusion. Our present purpose is analysis of transport property in silicone ionic liquids (SiILs) which is applicable to electrochemical devices. We applied the transient grating (TG) method in order to determine diffusion coefficients in SiILs.