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The viscosity of liquids under nanoconfinement remains controversial. Reportsrange from spontaneous solidification to no change in the viscosity at all.Here, we present thorough measurements with a small-amplitude linear atomicforce microscopy technique and careful consideration of the confinementgeometry, to show that in a weakly interacting liquid, average viscosityremains bulk like, except for strong shear thinning once the liquid is confinedto less than four molecular layers. Overlaid over this bulk-like viscousbehavior are stiffness and damping oscillations, indicating non-continuumbehavior, as well as an elastic response when the liquid is allowed to order inthe confinement gap.

Bulk-like viscosity and shear thinning during dynamic compression of a nanoconfined liquid