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Bipolar Janus particle assembly in microdevice.

Mohammad R Hossan1, Partha P Gopmandal, Robert Dillon

  • 1Department of Engineering and Physics, University of Central Oklahoma, OK, USA.

Electrophoresis
|December 6, 2014
PubMed
Summary
This summary is machine-generated.

This study models bipolar Janus particle behavior, revealing self-orientation without electric fields and alignment with DC fields. Particle assembly time depends on size and charge density.

Keywords:
Bipolar particleImmersed boundary methodImmersed interface methodMicrofluidicsParticle assembly

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Area of Science:

  • Colloid and Interface Science
  • Computational Fluid Dynamics
  • Soft Matter Physics

Background:

  • Bipolar Janus particles exhibit unique behaviors due to their distinct surface properties.
  • Understanding their electro-orientation and interactions is crucial for micro-device applications.

Purpose of the Study:

  • To investigate the transient electro-orientation and particle-particle interactions of ellipsoidal bipolar Janus particles.
  • To model particle dynamics under DC electric fields using an interface-resolved numerical scheme.

Main Methods:

  • A body force term based on the Maxwell stress tensor was incorporated into fluid flow equations.
  • An interface-resolved numerical scheme was employed to compute electric and flow fields, considering finite particle size.

Main Results:

  • In the absence of an electric field, particles self-orient to equilibrium positions, with time dependent on initial configuration and separation.
  • Under an electric field, particles rotate to align along the field, forming head-to-tail chains.
  • Assembly time is significantly influenced by particle size and bipolar charge density.

Conclusions:

  • The numerical algorithm accurately captures forces on polar ends, a challenge for non-interface resolved methods.
  • The developed model is applicable to a broader range of dual-faced Janus particles.
  • This research provides insights into controlling Janus particle assembly for advanced applications.