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We analyze the influence of finite ion size effects in the response of asalt-free concentrated suspension of spherical particles to an oscillatingelectric field. Salt-free suspensions are just composed of charged colloidalparticles and the added counterions released by the particles to the solution,that counterbalance their surface charge. In the frequency domain, we study thedynamic electrophoretic mobility of the particles and the dielectric responseof the suspension. We find that the Maxwell-Wagner-O'Konski process associatedwith the counterions condensation layer, is enhanced for moderate to highparticle charges, yielding an increment of the mobility for such frequencies.We also find that the increment of the mobility grows with ion size andparticle charge. All these facts show the importance of including ion sizeeffects in any extension attempting to improve standard electrokinetic models.

Ion size effects on the electrokinetics of salt-free concentrated suspensions in ac fields