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- W3092763944 abstract "Electric fields modify the structural and dynamical properties of room temperature ionic liquids (RTILs) providing a physical principle to develop tunable lubrication devices. Using nonequilibrium molecular dynamics atomistic simulations, we investigate the impact of the composition of imidazolium RTILs on the in-plane ordering of ionic layers in nanogaps. We consider imidazolium cations and widely used anions featuring different molecular structures, spherical ([BF4]−), elongated surfactant-like ([C2SO4]−), and elongated with a more delocalized charge ([NTf2]−). The interplay of surface charge, surface polarity, and anion geometry enables the formation of crystal-like structures in [BF4]− and [NTf2]− nanofilms, while [C2SO4]− nanofilms form disordered layers. We study how the ordering of the ionic liquid lubricant in the nanogap affects friction. Counterintuitively, we find that the friction force decreases with the ability of the RTILs to form crystal-like structures in the confined region. The crystallization can be activated or inhibited by changing the polarity of the surface, providing a mechanism to tune friction with electric fields." @default.
- W3092763944 created "2020-10-22" @default.
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- W3092763944 date "2020-10-15" @default.
- W3092763944 modified "2023-10-16" @default.
- W3092763944 title "Lateral Ordering in Nanoscale Ionic Liquid Films between Charged Surfaces Enhances Lubricity" @default.
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- W3092763944 doi "https://doi.org/10.1021/acsnano.0c05043" @default.
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