Abstract
Experimental studies of the dynamics of molecularly thin films using the Surface Force Apparatus (SFA) reveal a rich variety of behavior [1–13]. As the film thickness decreases, the relaxation times and viscosities of simple fluids increase by many orders of magnitude. At small enough thicknesses, films enter a solid state that is capable of resisting static shear forces [1,3,11–13]. When the yield stress of these films is exceeded, motion occurs through intermittent stick-slip events rather than smooth sliding [3–5,8,9]. Stop/start experiments [3, 5] and the response to oscillatory shear [10] reveal that films store memory of their previous sliding history for very long times.
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