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Synthesis and Characterization of Supramolecular Colloids
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Structure and dynamics of self-assembling colloidal monolayers in oscillating magnetic fields.

Alison E Koser1, Nathan C Keim1, Paulo E Arratia1

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 4, 2014
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Summary

Viscous stresses in active fluids hinder the self-assembly of magnetic colloidal particles. These stresses reduce hexagonal ordering and slow down cluster formation, impacting collective behavior in these systems.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Active Matter Systems

Background:

  • Active fluids, composed of energy-dissipating particles, exhibit complex phenomena like collective flows and pattern formation.
  • Fluid-mediated viscous stresses are crucial in the collective behavior of active particles in liquids.
  • Magnetically driven colloidal particles are known to self-assemble into organized structures.

Purpose of the Study:

  • To experimentally investigate the role of viscous stresses in the dynamics of self-assembling magnetically driven colloidal particles.
  • To understand how viscous stresses affect the formation of organized hexagonal structures in colloidal systems.

Main Methods:

  • Experimental investigation of self-assembling magnetically driven colloidal particles.
  • Analysis of the impact of viscous stresses on hexagonal ordering, cluster size, and formation rate.
  • Quantification of time and length scales of cluster formation as a function of the Mason number (Mn).

Main Results:

  • Viscous stresses were found to reduce hexagonal ordering and decrease the rate of cluster formation.
  • Smaller clusters were generated in the presence of significant viscous stresses.
  • The time and length scales of cluster formation exhibit dependencies on the Mason number (Mn), scaling as t∝Mn and L∝Mn(-1/2).

Conclusions:

  • Viscous stresses play a significant role in hindering collective behavior in self-assembling colloidal systems.
  • The Mason number effectively characterizes the interplay between viscous and magnetic forces in governing cluster dynamics.
  • Understanding these stresses is key to controlling self-assembly and emergent behaviors in active matter.