(684d) Precision Assembly of Oppositely- and Like-Charged Nano-Objects Mediated by Charge-Induced Dipole Interactions

Walker, D. A., Northwestern University
Wilmer, C. E., Northwestern University
Kowalczyk, B., Northwestern University
Bishop, K. J., Northwestern University
Grzybowski, B. A., Northwestern University

The field of electrostatics is thought, by many, to be ?fully understood' - however at the nano-scale we continue to discover intriguing and counter-intuitive phenomena. Here we present the results from a recent fundamental study investigating the electrostatic interactions of non-spherically symmetric nanoparticles. We show that electrostatic interactions can be used to control the assemblies of charged nano-objects with precision down to 7 nm. Specifically, we show that polarization effects and charge-induced dipoles within the metallic core of the nanoparticles can, under certain conditions, dominate the better known charge-charge interactions. Remarkably, these charge-induced dipole interactions can mediate orientation specific aggregation between both oppositely- and like-charged particles. A mixture of both experimental and theoretical evidence will be presented.