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Two methods for measuring complex viscosity in dusty plasma liquids show similar trends. Results differ slightly quantitatively, with the current experiment minimizing shear thinning effects for more accurate measurements.

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Area of Science:

  • Plasma Physics
  • Condensed Matter Physics
  • Rheology

Background:

  • Strongly coupled plasmas in a liquid phase exhibit complex viscosity η(ω), a frequency-dependent property.
  • Characterizing this viscosity is crucial for understanding plasma behavior in liquid-like states.

Purpose of the Study:

  • To compare complex viscosity η(ω) measurements obtained from two distinct experimental methods in dusty plasma liquids.
  • To validate the accuracy and identify potential discrepancies between nonequilibrium and equilibrium measurement techniques.

Main Methods:

  • A nonequilibrium method applied sinusoidal shear using counterpropagating laser beams to a 2D dusty plasma liquid.
  • An equilibrium method calculated η(ω) using the generalized Green-Kubo relation without external shear.
  • Both methods analyzed the frequency dependence of the real and imaginary parts of η(ω).

Main Results:

  • Both methods qualitatively agreed on the frequency trends: real part diminished, imaginary part increased with frequency.
  • Quantitative values of η(ω) showed slight differences between the two methods.
  • Measured viscosity was significantly higher than in a previous experiment, attributed to minimized shear thinning in the current study.

Conclusions:

  • The two distinct methods for measuring complex viscosity in dusty plasma liquids provide qualitatively consistent results.
  • The experimental design effectively minimized shear thinning, leading to potentially more accurate viscosity measurements.
  • Further investigation into quantitative differences and the impact of shear thinning is warranted.