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Plasmonically absorbing nanofluids exhibit light-induced electrokinetics. We measure an electrical response to the light-induced Rayleigh-Bénard-Marangoni convective instabilities in gold-polyvinylpyrrolidone (PVP) nanoparticles (NPs) suspended in isopropanol and water. Microampere current oscillations are measured and attributed to the presence of the Au-PVP NPs with negative zeta potential, in correspondence with the accompanying thermal lens oscillations and a nanofluid thermoelectric effect. The measured electrical oscillations represent an electrohydrodynamic stability driven by light, one among many that should be observed with plasmonic nanoparticles in liquids.


Originally published as: Shrestha, Sujan, Jorge Luis Dominguez-Juarez and Luat T. Vuong, "Light-induced electrohydrodynamic instability in plasmonically absorbing gold nanofluids," Physical Review Fluids, vol. 2, no. 6, June 2017, 064201. doi: 10.1103/PhysRevFluids.2.064201.

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