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Related Experiment Videos

Effective interactions between inclusions in complex fluids driven out of equilibrium.

Denis Bartolo1, Armand Ajdari, Jean-Baptiste Fournier

  • 1Laboratoire de Physico-Chimie Théorique, UMR CNRS 7083, ESPCI, Paris, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 26, 2005
PubMed
Summary

Researchers explored fluctuation-induced forces in non-equilibrium soft materials. Shaking-driven forces on objects differ from thermal Casimir forces, offering tunable interactions for material applications.

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Area of Science:

  • Soft Matter Physics
  • Non-Equilibrium Statistical Mechanics

Background:

  • Fluctuation-induced effective interactions are well-studied in equilibrium systems.
  • Understanding these interactions in driven systems is crucial for novel material design.

Purpose of the Study:

  • To extend the concept of fluctuation-induced forces to systems driven out of equilibrium.
  • To investigate the nature and tunability of forces on macroscopic objects in shaken soft materials.

Main Methods:

  • Computational analysis of forces on macroscopic objects.
  • Modeling soft materials subjected to external shaking.

Main Results:

  • Forces in shaken systems are distinct from equilibrium Casimir forces.
  • The sign, range, and amplitude of these forces are tunable by adjusting shaking parameters.

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  • Dispersion of shaking-induced forces was analyzed.

    • Conclusions:

    • External driving offers a method to control effective interactions in soft materials.
    • Tunable forces have potential applications in directing phase ordering and material self-assembly.