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Colloid-colloid and colloid-wall interactions in driven suspensions.

Matthias Krüger1, Markus Rauscher

  • 1Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany. matthias.krueger@uni-konstanz.de

The Journal of Chemical Physics
|July 28, 2007
PubMed
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We studied forces between colloids in a fluid suspension. Driving colloids side-by-side or along a wall increases friction, while tailgating colloids experience reduced friction and attraction.

Area of Science:

  • Soft matter physics
  • Colloidal dynamics
  • Statistical mechanics

Background:

  • Understanding colloidal interactions is crucial for materials science.
  • Nonequilibrium effects significantly alter colloidal behavior.
  • Fluid structure mediates forces between particles.

Purpose of the Study:

  • Investigate nonequilibrium fluid structure-mediated forces between driven colloids.
  • Analyze forces between a colloid and a wall in a Brownian particle suspension.
  • Compare analytical and numerical solutions with superposition approximations.

Main Methods:

  • Solving the Smoluchowski equation in bispherical coordinates.
  • Employing the method of reflections for stationary situations.
  • Utilizing linear approximation for small velocities and numerical methods for intermediate velocities.

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Main Results:

  • Friction is enhanced for side-by-side colloids and colloids moving along a wall.
  • Friction is reduced for tailgating colloids.
  • Side-by-side colloids experience solute-induced repulsion; tailgating colloids attract each other.

Conclusions:

  • Nonequilibrium fluid structure significantly modifies intercolloidal forces.
  • The study provides insights into friction and interaction potentials in driven colloidal systems.
  • Results challenge previous superposition approximations and highlight the importance of dynamic effects.