Biomedical Microdevices

, Volume 12, Issue 1, pp 115–124

Droplet position control in digital microfluidic systems

Authors

    • School of EngineeringUniversity of British Columbia Okanagan
  • Homayoun Najjaran
    • School of EngineeringUniversity of British Columbia Okanagan
Article

DOI: 10.1007/s10544-009-9366-9

Cite this article as:
Bhattacharjee, B. & Najjaran, H. Biomed Microdevices (2010) 12: 115. doi:10.1007/s10544-009-9366-9

Abstract

Research on so called digital microfluidic systems (DMS) capable of manipulating individual microdroplets on a cell-based structure has enormously increased in the past few years, mainly due to the demand of the technology-dependent biomedical applications. Significant research in this area has been related to the simulation and modeling of droplet motion, demonstration of different drop actuation techniques on laboratory-scale prototypes, and droplet routing and scheduling for more efficient assay procedures. This paper introduces the basics of the control analysis and design of a DMS, which is a relatively unexplored area in digital microfluidics. This paper starts with a discussion on a simplified dynamic model of droplet motion in a planar array of cells, and continues with more complicated dynamic models that are necessary to realize the structure of an appropriate closed-loop control system for the DMS. The control analysis and design includes both the transient and steady-state responses of the DMS under external driving forces. The proposed control analysis and design approach is implemented into SIMULINK® models to demonstrate the performance of the DMS through simulation using the system parameters previously reported in the literature.

Keywords

Digital microfluidicsDropletFeedback control

Copyright information

© Springer Science+Business Media, LLC 2009