Electrostatic interactions between spheroidal dielectric particles

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Abstract

Theory is developed to address the significant problem of electrostatic interactions between charged polarizable dielectric spheroids. The electrostatic force is defined by particle dimensions and charge, dielectric constants of the interacting particles and medium, and the interparticle separation distance; and it is expressed in the form of an integral over the particle surface. The switching behavior between like charge repulsion and attraction is demonstrated as depending on the ratio of the major and minor axes of spheroids. When the major and minor axes are equal, the theory yields a solution equivalent to that obtained for spherical particles. Limiting cases are presented for nonpolarizable spheroids, which describe the electrostatic behavior of charged rods, discs, and point charges. The developed theory represents an important step toward comprehensive understanding of direct interactions and mechanisms of electrostatically driven self-assembly processes.

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Derbenev, I. N., Filippov, A. V., Stace, A. J., & Besley, E. (2020). Electrostatic interactions between spheroidal dielectric particles. Journal of Chemical Physics, 152(2). https://doi.org/10.1063/1.5129756

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