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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Positive Temperature Coefficient Compensating Heating for Analytical Devices.

Ronda Gras1,2, Jim Luong1,3, Matthias Pursch4

  • 1Dow Chemical Canada ULC , Highway 15 , Fort Saskatchewan , Alberta T8L 2P4 , Canada.

Analytical Chemistry
|May 12, 2018
PubMed
Summary
This summary is machine-generated.

Positive temperature coefficient (PTC) thermistors enable efficient, safe heating for analytical devices. This technology enhances gas chromatography detectors for analyzing high-boiling-point compounds with excellent precision.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Thermal Engineering

Background:

  • Positive temperature coefficient (PTC) thermistors are increasingly used as heating elements in various applications.
  • PTC heating offers advantages like energy efficiency, inherent safety, and miniaturization for portable devices.
  • These heaters can reach high temperatures (up to 230 °C) without complex control electronics.

Purpose of the Study:

  • To integrate PTC heating technology into a commercial diode array photometric detector.
  • To assess the suitability of PTC heating for gas chromatography (GC) applications.
  • To enable the analysis of volatile and semivolatile compounds with higher boiling points.

Main Methods:

  • Incorporated PTC technology into the flow cell of a diode array photometric detector.
  • Heated the detector cartridge flow cell to target temperatures between 70 °C and 150 °C.
  • Evaluated the detector's performance with model compounds (alkene homologues C8-C16) using GC.

Main Results:

  • The modified detector successfully operated at temperatures up to 150 °C without adverse effects on materials or electronics.
  • Analysis of compounds with boiling points up to 285 °C (n-hexadecene equivalent) became feasible.
  • Achieved high repeatability with relative standard deviations (RSD) < 0.01% for retention time and 3% for peak area (n=10).

Conclusions:

  • PTC thermistors provide a robust and efficient heating solution for GC photometric detectors.
  • This advancement expands the analytical capabilities for higher-boiling-point compounds.
  • The technology offers a scalable and safe thermal management strategy for analytical instrumentation.