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Soft colloids driven and sheared by traveling wave fields.

M Rex1, H Löwen, C N Likos

  • 1Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2005
PubMed
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We investigated soft colloid dynamics under moving potentials. Density profiles showed nonmonotonic behavior with traveling wave speed and shear, offering experimental verifiability with laser fields.

Area of Science:

  • Soft matter physics
  • Colloidal science
  • Statistical mechanics

Background:

  • Understanding the dynamic behavior of colloidal suspensions is crucial for materials science.
  • External potentials significantly influence the structure and dynamics of colloids.

Purpose of the Study:

  • To investigate the steady-state density profiles of soft colloids under external moving potentials.
  • To explore the nonmonotonic dependence of density profiles on wave velocity and shear rate.

Main Methods:

  • Dynamical density functional theory (DDFT)
  • Brownian dynamics (BD) computer simulations
  • Analysis of soft colloids with Gaussian pair potentials

Main Results:

Related Experiment Videos

  • Nonmonotonic amplitude of steady-state density with traveling wave speed when the wave has an edge.
  • Nonmonotonic shear resistance as a function of wall velocity in a confined suspension.
  • Good agreement between DDFT predictions and BD simulation data.

    • Conclusions:

    • The dynamics of soft colloids in moving potentials exhibit complex, nonmonotonic behaviors.
    • These findings are experimentally verifiable using laser-optical fields.
    • DDFT is a reliable tool for predicting colloidal suspension dynamics.