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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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Self-propelled torus colloids.

Jiyuan Wang1, Mu-Jie Huang2, Raymond Kapral2

  • 1School of Electrical and Control Engineering, Heilongjiang University of Science and Technology, Harbin 150022, People's Republic of China.

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|July 10, 2020
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Summary
This summary is machine-generated.

Chemically powered torus colloids exhibit unique motion influenced by their geometry. Simulations reveal how torus shape factors, like hole size, affect self-diffusiophoretic propulsion in active matter systems.

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Area of Science:

  • Colloid science
  • Active matter physics
  • Computational fluid dynamics

Background:

  • Chemically powered colloidal particles, known as active matter, display complex behaviors.
  • While spherical Janus particles are common, the geometry of active colloids significantly impacts their dynamics.
  • Torus-shaped colloids have shown distinct behaviors compared to spheres in experimental studies.

Purpose of the Study:

  • To investigate the influence of geometric factors on the active motion of self-diffusiophoretic torus colloids.
  • To understand how torus shape parameters affect the concentration and velocity fields crucial for propulsion.
  • To provide a simulation framework for studying complex-geometry colloidal motors.

Main Methods:

  • Coarse-grained microscopic simulations of torus colloid dynamics.
  • Analysis of concentration and velocity fields around the colloids.
  • Modeling of colloids in fluid media with chemical reactions and flows.

Main Results:

  • Torus geometric parameters, including hole size and tube thickness, strongly influence the surrounding concentration and velocity fields.
  • These field variations directly impact the self-diffusiophoretic propulsion of the torus colloids.
  • The simulation method allows for the study of diverse torus geometries and their dynamic characteristics.

Conclusions:

  • The geometry of torus colloids is a critical determinant of their active propulsion mechanisms.
  • Simulation results highlight the importance of specific geometric features in tailoring colloid behavior.
  • This model facilitates research into collective behaviors and confined dynamics of complex-shaped active colloids for potential applications.