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Permeation-driven flow in poly(dimethylsiloxane) microfluidic devices.

Greg C Randall1, Patrick S Doyle

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 27, 2005
PubMed
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Researchers discovered that fluid permeation through poly(dimethylsiloxane) microchannels generates significant flow. They developed a model and methods to control and utilize this passive flow for applications like bead stacking and chemical concentration.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Microfluidics

Background:

  • Poly(dimethylsiloxane) (PDMS) is a common material for microfluidic devices.
  • Decreasing device size leads to significant hydrodynamic flow due to fluid permeation through channel walls.

Purpose of the Study:

  • To develop a theoretical model for passively generated hydrodynamic flow in microchannels.
  • To verify the model with experimental data.
  • To present methods for controlling and utilizing this flow.

Main Methods:

  • Theoretical modeling of fluid permeation.
  • Single bead tracking experiments for flow verification.
  • Development of a method to inhibit mass transfer for flow elimination.

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Main Results:

  • A theoretical model demonstrated passive generation of high flow rates (>10 microm/s) in straight microchannels.
  • Experimental verification using single bead tracking confirmed the model's predictions.
  • A method to inhibit water permeation into PDMS walls was successfully developed.

Conclusions:

  • Passive hydrodynamic flow is a significant factor in microfluidic devices due to PDMS properties.
  • This flow can be controlled, either eliminated or harnessed for various microfluidic applications.
  • Potential applications include bead stacking, chemical concentration, and passive pumping.