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We investigate the structure of the [bmim][Tf2N]/silica interface bysimulating the indentation of a thin (4 nm) [bmim][Tf2N] film by a hardnanometric tip. The ionic liquid/silica interface is represented in atomisticdetail, while the tip is modelled by a spherical mesoscopic particleinteracting via an effective short-range potential. Plots of the normal force(Fz) on the tip as a function of its distance from the silica surface highlightthe effect of weak layering in the ionic liquid structure, as well as theprogressive loss of fluidity in approaching the silica surface. The simulationresults for Fz are in near-quantitative agreement with new AFM data measured onthe same [bmim][Tf2N]/silica interface at comparable thermodynamic conditions.

Nano-indentation of a room-temperature ionic liquid film on silica: a computational experiment