Confined liquid: Simultaneous observation of a molecularly layered structure and hydrodynamic slip

The force profile between a glass microsphere and mica in 1-propanol has been measured with the colloidal probe technique. Oscillatory solvation forces indicate a layered structure of the confined propanol for at least three layers. In the same experiment, hydrodynamic forces were measured at high approaching velocity. Comparing measured force curves with calculations we found a significant effective slip, which could be described by a slip length of 10-14 nm. (C) 2002 American Institute of Physics.