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Embedded MicroHeating Elements in Polymeric MicroChannels for Temperature Control and Fluid Flow Sensing.

Michael Gaitan1, Laurie E Locascio1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8124.

Journal of Research of the National Institute of Standards and Technology
|July 2, 2016
PubMed
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This study demonstrates novel integrated circuit (IC)-based microheaters in polydimethylsiloxane (PDMS) for fluid temperature control and flow sensing. This microfluidic system offers precise fluid management for various applications.

Area of Science:

  • Microfluidics
  • Integrated Circuits
  • Materials Science

Background:

  • Microfluidic devices require precise control over fluid parameters.
  • Existing methods for fluid sensing and temperature regulation can be complex and costly.

Purpose of the Study:

  • To demonstrate the first use of IC-based microheaters in PDMS for fluid temperature control and flow sensing.
  • To develop a cost-effective and integrated solution for microfluidic fluid management.

Main Methods:

  • Fabrication of microchannels in polydimethylsiloxane (PDMS) using a silicon wafer template.
  • Bonding of PDMS to an IC containing micromachined microheating elements.
  • Integration of capillary tubing for fluid introduction and external pumping.
Keywords:
flow sensormicrofluidicsmicroheating elementspolymer microchannels

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Main Results:

  • Successful demonstration of fluid heating via bubble formation on microheaters.
  • Sensing of fluid flow by measuring changes in microheater resistance, similar to a hot wire anemometer.
  • Achieved a flow sensing detection limit of ± 320 pL/s.

Conclusions:

  • Integrated circuit-based microheaters embedded in PDMS are effective for fluid temperature control and flow sensing.
  • This technology provides a new platform for advanced microfluidic applications.
  • The developed system offers a sensitive and integrated approach to microfluidic parameter monitoring.