Issue 1, 2008
From the journal:

Lab on a Chip

Remotely powered distributed microfluidic pumps and mixers based on miniature diodes†

Suk Tai Chang,a   Erin Beaumont,b   Dimiter N. Petsevb  and  Orlin D. Velev*a  

* Corresponding authors

a Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, USA
E-mail: odvelev@ncsu.edu
Fax: +1-919-515-3465
Tel: +1-919-513-4318

b Department of Chemical & Nuclear Engineering and Centre for Biomedical Engineering, University of New Mexico, Albuquerque, USA

Abstract

We demonstrate new principles of microfluidic pumping and mixing by electronic components integrated into a microfluidic chip. The miniature diodes embedded into the microchannel walls rectify the voltage induced between their electrodes from an external alternating electric field. The resulting electroosmotic flows, developed in the vicinity of the diode surfaces, were utilized for pumping or mixing of the fluid in the microfluidic channel. The flow velocity of liquid pumped by the diodes facing in the same direction linearly increased with the magnitude of the applied voltage and the pumping direction could be controlled by the pH of the solutions. The transverse flow driven by the localized electroosmotic flux between diodes oriented oppositely on the microchannel was used in microfluidic mixers. The experimental results were interpreted by numerical simulations of the electrohydrodynamic flows. The techniques may be used in novel actively controlled microfluidic–electronic chips.

Graphical abstract: Remotely powered distributed microfluidic pumps and mixers based on miniature diodes

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Article information

DOI
https://doi.org/10.1039/B712108C
Article type
Paper
Submitted
07 Aug 2007
Accepted
16 Oct 2007
First published
08 Nov 2007

Lab Chip, 2008,8, 117-124

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Remotely powered distributed microfluidic pumps and mixers based on miniature diodes

S. T. Chang, E. Beaumont, D. N. Petsev and O. D. Velev, Lab Chip, 2008, 8, 117 DOI: 10.1039/B712108C

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