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A microfluidic channel flow cell for electrochemical ESR.

Andrew J Wain1, Richard G Compton, Rudolph Le Roux

  • 1Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom.

The Journal of Physical Chemistry. B
|December 22, 2006
PubMed
Summary

We developed microfluidic devices for simultaneous electrochemical Electron Spin Resonance (ESR) measurements. These devices enable sensitive detection of radical cations in flowing solutions.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Microfluidics

Background:

  • Electron Spin Resonance (ESR) spectroscopy is a powerful technique for studying paramagnetic species.
  • In situ electrochemical ESR requires specialized reactor designs for simultaneous measurements.
  • Microfluidic devices offer advantages in sample handling and sensitivity for electrochemical applications.

Purpose of the Study:

  • To design, fabricate, and characterize microfluidic channel flow devices for in situ simultaneous hydrodynamic electrochemical ESR.
  • To achieve high sensitivity and signal-to-noise ratio in electrochemical ESR measurements.
  • To validate device performance using a model system and numerical simulations.

Main Methods:

  • Fabrication of microelectrochemical reactors with gold film electrodes in rectangular microchannels (350 µm height, 500-2000 µm width).
  • Integration of microchannels within a cylindrical TE011 resonant cavity to minimize dielectric loss.
  • Electrochemical oxidation of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) in acetonitrile as a model system.
  • Measurement of ESR signal intensity as a function of flow rate.
  • 3-dimensional numerical modeling of hydrodynamic flow profiles.

Main Results:

  • Successful design and fabrication of microfluidic electrochemical reactors.
  • Demonstrated high sensitivity and signal-to-noise ratio for the ESR spectra of TMPD radical cation.
  • Observed minimal dielectric loss due to small channel dimensions.
  • Validated experimental results with 3D numerical modeling of flow dynamics.

Conclusions:

  • Microfluidic channel flow devices enable sensitive in situ simultaneous hydrodynamic electrochemical ESR.
  • The developed system is suitable for studying short-lived radical species generated electrochemically.
  • The integration of microfluidics and ESR spectroscopy opens new avenues for electrochemical analysis.