Electrokinetically driven deterministic lateral displacement for particle separation in microfluidic devices

Srinivas Hanasoge, Raghavendra Devendra, Francisco J. Diez, German Drazer

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

An electrokinetically driven deterministic lateral displacement device is proposed for the continuous, two-dimensional fractionation of suspensions in microfluidic platforms. The suspended species are driven through an array of regularly spaced cylindrical posts by applying an electric field across the device. We explore the entire range of orientations of the driving field with respect to the array of obstacles and show that, at specific forcing angles, particles of different size migrate in different directions, thus enabling continuous, two-dimensional separation. We discuss a number of features observed in the motion of the particles, including directional locking and sharp transitions between migration angles upon variations in the direction of the force, that are advantageous for high-resolution two-dimensional separation. A simple model based on individual particle–obstacle interactions accurately describes the migration angle of the particles depending on the orientation of the driving field and can be used to reconfigure the electric field depending on the composition of the samples.

Original languageEnglish (US)
Pages (from-to)1195-1200
Number of pages6
JournalMicrofluidics and Nanofluidics
Volume18
Issue number5-6
DOIs
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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