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Published on: October 1, 2007
Remotely powered distributed microfluidic pumps and mixers based on miniature diodes
Suk Tai Chang1, Erin Beaumont, Dimiter N Petsev
1Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, USA.
Lab on a Chip
|December 21, 2007
Summary
New microfluidic devices use integrated electronic diodes to control fluid pumping and mixing. These diodes generate electroosmotic flows, enabling precise manipulation of liquids within microchannels by adjusting voltage and solution pH.
Area of Science:
- Microfluidics
- Electronic Engineering
- Electrokinetics
Background:
- Microfluidic systems require efficient methods for fluid manipulation, such as pumping and mixing.
- Integrating electronic components directly into microfluidic devices offers potential for novel functionalities.
- Electroosmotic flow (EOF) is a key phenomenon in microfluidics, driven by electric fields interacting with charged surfaces.
Purpose of the Study:
- To demonstrate novel principles for microfluidic pumping and mixing using integrated electronic components.
- To investigate the use of miniature diodes embedded in microchannels for fluid manipulation.
- To explore the control mechanisms for flow velocity and direction in diode-driven microfluidic systems.
Main Methods:
- Embedding miniature diodes into microchannel walls to rectify induced voltages from an external alternating electric field.
- Utilizing the resulting electroosmotic flows near diode surfaces for pumping and mixing.
- Conducting experiments with varying applied voltages and solution pH levels.
- Employing numerical simulations of electrohydrodynamic flows to interpret experimental results.
Main Results:
- Diodes integrated into microchannels successfully generated electroosmotic flows for pumping and mixing.
- Pumping velocity showed a linear increase with applied voltage magnitude when diodes faced the same direction.
- Pumping direction was controllable by adjusting the pH of the solutions.
- Localized electroosmotic flux between oppositely oriented diodes effectively drove transverse flow for microfluidic mixing.
Conclusions:
- The developed techniques offer new principles for actively controlled microfluidic pumping and mixing.
- Integrated electronic components, specifically diodes, provide a versatile platform for microfluidic manipulation.
- The ability to control flow via voltage and pH opens possibilities for sophisticated microfluidic-electronic integrated chips.
