Highly Spherical Nanoparticles Probe Gigahertz Viscoelastic Flows of Simple Liquids Without the No-Slip Condition
Brian Uthe, Jesse F Collis, Mahyar Madadi, John E Sader, Matthew Pelton
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | AMER CHEMICAL SOC | Published : 2021
Simple liquids are conventionally described by Newtonian fluid mechanics, based on the assumption that relaxation processes in the flow occur much faster than the rate at which the fluid is driven. Nanoscale solids, however, have characteristic mechanical response times on the picosecond scale, which are comparable to mechanical relaxation times in simple liquids; as a result, viscoelastic effects in the liquid must be considered. These effects have been observed using time-resolved optical measurements of vibrating nanoparticles, but interpretation has often been complicated by finite velocity slip at the liquid-solid interface. Here, we use highly spherical gold nanoparticles to drive flow..View full abstract
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Awarded by U.S. National Science Foundation
Awarded by Australian Research Council Centre of Excellence in Exciton Science
M.P. and B.U. acknowledge funding from the U.S. National Science Foundation under Grant DMR-1554895. J.F.C., M.M., and J.E.S. acknowledge support from the Australian Research Council Centre of Excellence in Exciton Science (CE170100026) and the Australian Research Council Grants Scheme.