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Swimming to Stability: Structural and Dynamical Control via Active Doping.

Ahmad K Omar1, Yanze Wu1,2, Zhen-Gang Wang1

  • 1Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States.

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Summary
This summary is machine-generated.

Active particles in colloidal gels can engineer the material

Keywords:
Brownian dynamicsactive mattercolloidal geldepletiondynamic assembly

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Chemical Engineering

Background:

  • External fields influence soft material free energy landscapes for nanostructure assembly.
  • Colloidal gels are model soft materials with complex free energy landscapes.

Purpose of the Study:

  • To investigate how internal fields from active particles modulate colloidal gel dynamics.
  • To explore active particle control over gel structure and kinetics.

Main Methods:

  • Computer simulations of a model colloidal gel.
  • Incorporation of a small fraction of active particles.
  • Tuning active particle properties (swim force, persistence length) and solvent viscosity.

Main Results:

  • Active particles provide pathways to overcome kinetic barriers in gels.
  • Active particles can induce depletion-like forces without size asymmetry.
  • Tuning active particle properties and viscosity alters gel phase space and transport properties.

Conclusions:

  • A small fraction of active particles offers significant structural and kinetic control over soft materials.
  • Dynamical properties of embedded active particles are key to modulating material behavior.
  • This approach enables precise control over soft material assembly and properties.