Viscoelastic Flows in Simple Liquids Generated by Vibrating Nanostructures
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1.
California Institute of Technology
Abstract
Newtonian fluid mechanics, in which the shear stress is proportional to the strain rate, is synonymous with the flow of simple liquids such as water. We report the measurement and theoretical verification of non-Newtonian, viscoelastic flow phenomena produced by the high-frequency (20 GHz) vibration of gold nanoparticles immersed in water-glycerol mixtures. The observed viscoelasticity is not due to molecular confinement, but is a bulk continuum effect arising from the short time scale of vibration. This represents the first direct mechanical measurement of the intrinsic viscoelastic properties of simple bulk liquids, and opens a new paradigm for understanding extremely high frequency fluid mechanics, nanoscale sensing technologies, and biophysical processes.
Copyright and License
© 2013 American Physical Society.
Acknowledgement
We thank D. Gosztola for valuable assistance with the transient-absorption measurements. This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility under Contract No. DE-AC02-06CH11357. E. M. was supported by NSF Grant No. CHE1111799. This research was supported by the Australian Research Council Grants Scheme and by Caltech's Kavli Nanoscience Institute.
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Additional details
- ISSN
- 1079-7114
- United States Department of Energy
- DE-AC02-06CH11357
- National Science Foundation
- CHE-1111799
- Australian Research Council
- Caltech groups
- Kavli Nanoscience Institute