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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Dipolar colloids in three dimensions: non-equilibrium structure and re-entrant dynamics.

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This study explores 3D active colloids, revealing complex phase behaviors like dynamic labyrinthine phases and crystal formation. The findings advance understanding of collective dynamics in three-dimensional active matter systems.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Colloid Science

Background:

  • Minimal models are crucial for understanding collective behavior in active systems.
  • Active colloids offer tunable interactions, serving as experimental models for biological systems.
  • Research on active colloids has primarily focused on 2D systems, with less known about 3D behavior.

Purpose of the Study:

  • To investigate the collective behavior and phase transitions in a 3D experimental system of active colloids.
  • To explore the influence of self-propulsion, steric, and dipolar interactions on system dynamics.
  • To characterize phase behavior across a range of volume fractions up to 0.5.

Main Methods:

  • Utilized a 3D experimental system of active colloids.
  • Employed induced-charge electrophoresis via an AC electric field for particle self-propulsion.
  • Analyzed phase behavior, including active gas, labyrinthine, and crystalline phases.

Main Results:

  • Observed diverse phase behavior: active gas, dynamic labyrinthine phase, tetragonal and hexagonal crystals at high volume fractions.
  • Identified 2D sheets with large fluctuations at intermediate volume fractions, exhibiting symmetry breaking.
  • Discovered a complex, position-dependent relationship between electric field and particle dynamics.

Conclusions:

  • The 3D active colloid system exhibits rich phase behavior driven by competing interactions and activity.
  • Active sheets demonstrate unique symmetry-breaking properties perpendicular to the applied field.
  • The study highlights the complexity of 3D active matter and its potential for mimicking biological systems.