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Mechanisms of Directed Assembly of Colloidal Particles in Two Dimensions by Application of Electric Fields

  • Paul J. Sides
  • Christopher L. Wirth
  • Dennis C. Prieve
Chapter
Part of the Nanostructure Science and Technology book series (NST)

Abstract

When electric fields interact with particles immersed in liquids and levitated near electrodes, the particles assemble into structures such as ordered arrays or chains. For example, direct electric current flowing through an aqueous solution held between two parallel-plate electrodes produces two dimensional arrays of colloidal particles near one of the electrodes. A high frequency electric field imposed in-plane, by contrast, forms chains of particles. These phenomena have interested scientists and engineers for a century; the multiphysics of the phenomena make it a rich problem for both theoreticians and experimentalists. Experimental investigations into the translation of particles laterally along surfaces when electric fields are applied normally to those surfaces, and into chain formation when the field is applied tangentially, have led to proposed mechanisms and theory by which colloidal particles and even cells move relative to the nearby surface and relative to each other. These mechanisms-, electrophoresis, electroosmosis, electrohydrodynamics, induced dipole repulsion, and dielectrophoresis- and supporting experimental evidence are the main topics of this account.

Keywords

Zeta Potential Phase Angle Electric Field Gradient Electroosmotic Flow Directed Assembly 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

The authors acknowledge the support of the National Science Foundation for research on this topic through grants CTS0089875, CTS0338089, and CBET0730391.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Paul J. Sides
    • 1
  • Christopher L. Wirth
    • 1
  • Dennis C. Prieve
    • 1
  1. 1.Department of Chemical EngineeringCarnegie Mellon UniversityPittsburghUSA

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