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Title: Using Feedback Control of Microflows to Independently Steer Multiple Particles
Authors: Shapiro, Benjamin
Armani, Michael D.
Chaudhary, Satej
Probst, Roland
Type: Article
Keywords: electrophoretic
Feedback control
Electroosmotic actuation
Issue Date: Aug-2006
Publisher: IEEE
Citation: M.Armani, S.Chaudhary, R.Probst, B.Shapiro. Using Feedback Control of Micro-Flows to Independently Steer Multiple Particles. Journal of Microelectromechanical Systems (JMEMS), vol 15, no 4, pg 945-956, Aug 2006.
Abstract: In this paper, we show how to combine microfluidics and feedback control to independently steer multiple particles with micrometer accuracy in two spatial dimensions. The particles are steered by creating a fluid flow that carries all the particles from where they are to where they should be at each time step. Our control loop comprises sensing, computation, and actuation to steer particles along user-input trajectories. Particle locations are identified in real-time by an optical system and transferred to a control algorithm that then determines the electrode voltages necessary to create a flow field to carry all the particles to their next desired locations. The process repeats at the next time instant. Our method achieves inexpensive steering of particles by using conventional electroosmotic actuation in microfluidic channels. This type of particle steering does not require optical traps and can noninvasively steer neutral or charged particles and objects that cannot be captured by laser tweezers. (Laser tweezers cannot steer reflective particles, or particles where the index of refraction is lower than (or for more sophisticated optical vortex holographic tweezers does not differ substantially from) that of the surrounding medium.)We show proof-of-concept PDMS devices, having four and eightelectrodes, with control algorithms that can steer one and three particles, respectively. In particular, we demonstrate experimentally that it is possible to use electroosmotic flow to accurately steer and trap multiple particles at once.
Required Publisher Statement: Copyright © [2006] IEEE. Reprinted from JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Maryland 's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
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