Mou Sen, Rubano Andrea, Paparo Domenico
Dipartimento di Fisica "Ettore Pancini", Università di Napoli "Federico II" , Complesso universitario di Monte Sant'Angelo, via Cintia, 80126 Napoli, Italy.
ISASI-Institute of Applied Sciences and Intelligent Systems, Consiglio Nazionale delle Ricerche , via Campi Flegrei 34, 80078 Pozzuoli, Italy.
J Phys Chem B. 2017 Aug 3;121(30):7351-7358. doi: 10.1021/acs.jpcb.7b04706. Epub 2017 Jul 26.
Ionic liquids are salts found in their liquid state at ambient temperature. The physicochemical properties of ionic liquids can be tailored by selecting constituent cation and anion from numerous available ions. The physicochemical properties can be further tuned by mixing different neat ionic liquids. Reported data of ionic liquid mixtures reveal that frequently investigated properties such as density, viscosity, and thermal stability follow corresponding mixing laws. Complex permittivity in the interval of terahertz frequencies is of great importance to understand the molecular interactions and the solvation dynamics which drive the macroscopic properties of ionic liquids; however, to the best of our knowledge, there are few reports about the mixing behavior of complex permittivity in ionic liquid mixtures. In this contribution, binary mixtures of 1-butyl-3-methylimidazoulium iodide ([C4C1im]I) and 1-butyl-3- methylimidazoulium bis(trifluoromethylsulfonyl)imide ([C4C1im][NTf2]) are investigated in the terahertz spectral range, and the resulting low-energy spectra are analyzed in order to clarify the mixing laws at play. The results show that the complex permittivity of mixtures of [C4C1im]I and ([C4C1im][NTf2] obeys a linear mixing law.
离子液体是在环境温度下呈液态的盐。通过从众多可用离子中选择组成阳离子和阴离子，可以调整离子液体的物理化学性质。通过混合不同的纯离子液体，可以进一步调节物理化学性质。已报道的离子液体混合物数据表明，诸如密度、粘度和热稳定性等经常研究的性质遵循相应的混合定律。太赫兹频率区间内的复介电常数对于理解驱动离子液体宏观性质的分子相互作用和溶剂化动力学非常重要；然而，据我们所知,关于离子液体混合物中复介电常数混合行为的报道很少。在本论文中，研究了碘化1-丁基-3-甲基咪唑鎓（[C4C1im]I）和双（三氟甲基磺酰基）亚胺1-丁基-3-甲基咪唑鎓（[C4C1im][NTf2]）的二元混合物在太赫兹光谱范围内的情况，并对所得的低能光谱进行了分析，以阐明其中的混合定律。结果表明，[C4C1im]I和（[C4C1im][NTf2]）混合物的复介电常数服从线性混合定律。
