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• W2766334296 abstract "Room temperature ionic liquids (ILs) at solid surfaces have been recognized for their significant interfacial properties in electrochemical and electronic devices. To ascertain the interface effects, we investigate dynamical and structural properties of two ILs in nanoscale confinement at various temperatures. Specifically, we perform all-atom molecular dynamics simulations for ILs composed of 1-butyl-3-methylimidazolium cations and hexafluorophosphate ([Bmim][PF6]) or tetrafluoroborate ([Bmim][BF4]) anions sandwiched between amorphous silica slabs. Density profiles of the ionic species across the slit reveal that [PF6] and [BF4] anions tend to stay closer to the slab wall than [Bmim] cations resulting in a bi-layered arrangement in the interfacial region. For the cations, we observe a preferred orientation at the surface with the methyl groups pointing towards the wall and the butyl tails projected inwards. Mean square displacements and incoherent scattering function reveal slowed and heterogeneous dynamics of all ionic species in the slit pore. In particular, spatially resolved analyses show that the structural relaxation times increase by about two orders of magnitude when approaching the silica surfaces, an effect to be considered when designing applications. The altered structural and dynamical features of the confined ILs can be related to an existence of preferred sites for the anions on the amorphous silica surfaces. Detailed analyses of relations between the broadly distributed site and surface properties show that particularly stable anion sites result when triangular arrangements of silanol groups enable multiple hydrogen bonds with the various fluorine atoms of a given anion, elucidating an important trapping mechanism at the silica surface." @default.
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• W2766334296 date "2017-10-26" @default.
• W2766334296 modified "2023-10-01" @default.
• W2766334296 title "Effects of Silica Surfaces on the Structure and Dynamics of Room Temperature Ionic Liquids: A Molecular Dynamics Simulation Study" @default.
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