  We show, using extensive Molecular Dynamics simulations, that the dynamics of
the electric double layer (EDL) is very much dependent on the wettability of
the charged surface on which the EDL develops. For a wetting surface, the
dynamics, characterized by the so-called Zeta potential, is mainly controlled
by the electric properties of the surface, and our work provides a clear
interpretation for the traditionally introduced immobile Stern layer. In
contrast, the immobile layer disappears for non-wetting surfaces and the Zeta
potential deduced from electrokinetic effects is considerably amplified by the
existence of a slippage at the solid substrate.
