To continue a research of an electric field induced electroconductive aligned network formation in silicone oil (SO)/carbon black (CB) suspensions [1], electric field induced capacitance change of an air-gap capacitor filled with the SO/CB suspension was researched in this work. Although relatively viscous (1000 mPas) SO was used to prepare the suspension, applaying DC electric field (strength 100V/cm) to the SO/CB suspension containing 0.3wt% of the CB, rapid (approx. 1.3% s-1) capacitance increase was observed (Fig.1). Simultaneously measured AC conductance showed even much faster, non-linear increase (Fig.1). During the first 300 s of the CB filler alignment in the silicone oil, both – the capacitance and the conductance did not reach a saturation and continued to increase (the CB particle alignment process takes longer time to accomplish). Other SO/CB suspensions with different CB concentrations are going to be investigated at different AC frequencies in this work. The obtained results will be used for modeling and elaboration of polymer/nanoparticle composites with anisotropic properties. Acknowledgements This research was supported by the Latvian National Research Program in Materials Science (IMIS2). References 1. M. Knite, et al., A study of electric field-induced conductive aligned network formation in high structure carbon black/silicone oil fluids, Colloids Surf. A: Physicochem. Eng. Aspects (2016), http://dx.doi.org/10.1016/j.colsurfa. 2016.12.032