Contact-Free Templating of 3-D Colloidal Structures Using Spatially Nonuniform AC Electric Fields

Joshua Raveendran, Jeffery A. Wood, Aristides Docoslis*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
18 Downloads (Pure)


The formation of ordered and regularly shaped structures of colloidal particles with the aid of spatially non-uniform electric fields is a modern research area of great interest. This work demonstrates how alternating current (AC) electrokinetic effects (dielectrophoresis, electroosmosis) can serve as active and contact-free templates that drive the assembly of colloidal spheres into three-dimensional structures of various shapes and sizes in aqueous or non-aqueous liquids. The concept is demonstrated here with a set of quadrupolar planar microelectrodes having tip-to-tip separation of 100 microns. By controlling the electric field intensity, suspending fluid properties and mode of power delivery to the microelectrodes, assembly of silica microspheres (d=2.0 microns) into 3-D objects of square, circular, diamond and various asymmetric shapes of tens of microns in size can reproducibly be accomplished. Near-refractive index matching of suspensions encouraged ordered-type structures. All assemblies showed s...
Original languageEnglish
Pages (from-to)9619-9632
Number of pages14
Issue number37
Publication statusPublished - 20 Sept 2016


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