Viscoelasticity of 2D liquids quantified in a dusty plasma experiment

Abstract

The viscoelasticity of two-dimensional liquids is quantified in an experiment using a dusty plasma. An experimental method is demonstrated for measuring the wavenumber-dependent viscosity, $\eta (k)$, which is a quantitative indicator of viscoelasticity. Using an expression generalized here to include friction, $\eta (k)$ is computed from the transverse current autocorrelation function (TCAF), which is found by tracking random particle motion. The TCAF exhibits an oscillation that is a signature of elastic contributions to viscoelasticity. Simulations of a Yukawa liquid are consistent with the experiment.

5 pages text, 3 figures, 1 supplementary material, in press Physical Review Letters 2010

References in corpus (5)

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• Accurate particle position measurement from images
• Crystallization of a quasi-two-dimensional granular fluid
• Self-Diffusion in 2D Dusty Plasma Liquids: Numerical Simulation Results
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• Machine learning in the study of phase transition of two-dimensional complex plasmas
• Directional Locking in a 2D Yukawa Solid Modulated by a 2D Periodic Substrate
• Phonon spectra of a two-dimensional solid dusty plasma modified by two-dimensional periodic substrates
• The rheology of confined colloidal hard discs
• Experiment and model for a Stokes layer in a strongly coupled dusty plasma
• Superlubric-pinned transition of a two-dimensional solid dusty plasma under a periodic triangular substrate
• Dynamical commensuration effect in a two-dimensional Yukawa solid modulated by periodic substrates