Adding a small volume fraction of highly-conductive and highly-anisotropic nano-fillers such as carbon nanotubes (CNTs) and graphene nanoplateletes (GNPs) leads to dramatic rise in the electrical conductivity of inherently nonconductive polymers. The sudden rise in conductivity is understood as a result of the percolating network of fillers that are interconnected (electrically) through electron tunneling. We have implemented a percolation-tunneling model to study the effect of filler shape and spatial distribution on the effective electrical conductivity.
 “Tunneling-percolation behavior of polydisperse prolate and oblate ellipsoids”, S. Kale, F. Sabet, I. Jasiuk, and M. Ostoja-Starzewski, Journal of Applied Physics, 118(15), 154306, 2015. (Featured article on the cover page)
 “Effect of filler alignment on percolation in polymer nanocomposites using tunneling-percolation model”, S. Kale, F. Sabet, I. Jasiuk, and M. Ostoja-Starzewski, Journal of Applied Physics, 120, 045105-1-10, 2016.