An effective optics-electrochemistry approach to random packing density of non-equiaxed ellipsoids

The experimental method is the best approach to characterize the actual packing of spheres, but it is very troublesome to describe the random packing of spheres. Generally, it can only be used to simulate the packing of equal-diameter spheres, while the packing of non-equal-diameter spheres are more difficult, sometimes impossible. In this work, we have successfully investigated the problem of random packing of non-equiaxed ellipsoid by dynamic light scattering and electrochemical impedance spectroscopy. Moreover, we have successfully used the conductive NaTi₂(PO₄)₃ (NTP) nanoparticles to verify the random packing of non-equiaxed ellipsoids by dynamic light scattering and electrochemical impedance spectroscopy. The results imply that the packing density is the larger, and the conductivity is the higher. Additionally, the wider size-distribution is helpful for increasing packing density. This method avoids the puzzling consideration of friction, particle shape and size, material density, the geometry of container and the initial state. Therefore, this divergent thinking of utilizing the conductive materials to research the random packing of non-equiaxed ellipsoids may be worth considering for the study of the close packing of other materials.