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We report an investigation of the equilibrium and dynamic properties ofpolyelectrolyte solutions confined between platinum surfaces with a dynamicSurface Force Apparatus. The polyelectrolyte adsorbs on the surfaces in a densecompact layer bearing a surface charge in good agreement with the theoreticalpredictions. The flow of the solution on this charged adsorbed layer is probedover four decades of spatial scales and one decade of frequency by dynamicmeasurements. At distances larger than the hundredth of nanometers, the flow ofthe viscoelastic solution is well described by a partial slip boundarycondition. We show that the wall slip is quantitatively described by aninterfacial friction coefficient, according to the original Navier'sformulation, and not by a slip length. At smaller distance the partial slipmodel overestimates the solution mobility, and we observe the presence of a lowviscosity layer coating the surfaces. The viscosity and thickness of thisboundary layer are directly resolved, and found to be independent onshear-rate, frequency, and confinement. We discuss the thickness of the lowviscosity layer in terms of the structural length of the semi-dilute solutionand the Debye length screening the adsorbed layer charge.

Boundary flow of viscoelastic polyelectrolyte solutions