(558ay) The Size-Controlled Structure and Dynamical Property of Ionic Liquid inside the Nano-Confined Space

Ionic liquids (ILs) are consisting of only cations and anions, existing as a liquid near room temperature, and have been sanguinely viewed as a new green solvent in the field of green chemistry and new electrolyte of the supercapacitor. In the practical application scenario, the electrode or solid catalyst always exist plenty of nanopores and nanochannels. Confined in such nanospace, the interfacial structure and property of ILs will be far different from the bulk. On the other hand, the behaviors of ILs will be more complex than the traditional liquid due to the ionic nature and high viscosity. In this talk, we will discuss the size-driven structure and property of confined ionic liquid in two aspects: (1) The quantitative relations between vibrational property, configurational entropy, radial distribution function, hydrogen bonds network, external pressure, and local structure of ILs, showing the corresponding typical oscillated behavior as a function of the nanochannel size. (2) The intrinsic mechanism of nanochannel width and surface chemistry structure controlling the dynamical properties of confined ILs including viscosity, solid liquid friction, and nanoflow behavior. The results can be extended to the nanopore and nanochannel constructed by other two-dimensional materials and other organic liquid (such as the deep eutectic solvent). The comprehensive understandings of confined structure and thermodynamics will be helpful and meaningful for the efficient application of ILs in the process of green chemistry and energy storage.