A New Method to Determine Zeta Potential and Slip Coefficient Simultaneously

Liquid slip at hydrophobic surfaces in microchannels has frequently been observed. We present here an analytical solution for oscillating flow in a parallel-plate microchannel by combining electrokinetic transport phenomena with Navier's slip condition. Results suggest that the apparent and true zeta potential for a typical electrolye solution can differ by more than an order of magnitude with only a 1% slip. From our analysis, we propose a new method to measure simultaneously the true zeta potential and slip coefficient.