Behavior of nanofluids under DC divergent fields

A recent investigation on the DC stability of nanofluids has revealed some interesting phenomena regarding the polarization current; some unexpected slow peaks appeared after the voltage reached a precise value. In this work we have deepened and analyzed the possible mechanisms which could cause such experimental results. While in low concentration nanofluids a charge trapping mechanism seems to be the prevailing one, at higher concentration, the reduced nanoparticles distances and the lower energy barrier between two consecutive nanoparticles is able to activate the tunneling charge transfer among them, thus increasing their apparent mobility.