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Study on the Flow Field Distribution in Microfluidic Cells for Surface Plasmon Resonance Array Detection.

Wanwan Chen1, Jing Li2, Peng Wang1

  • 1Department of Precision Instrument, Tsinghua University, Beijing 100084, China.

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|May 25, 2024
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Summary

Optimizing microfluidic cell design with a 135° contact angle minimizes mass transfer effects for uniform flow fields. This enhances accuracy in surface plasmon resonance (SPR) array detection and high-throughput analysis.

Keywords:
SPR array detectionfinite element simulationflow fieldmicrofluidic cells

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Fluid Dynamics

Background:

  • Accurate surface plasmon resonance (SPR) array detection requires minimizing mass transfer effects and ensuring uniform flow fields in microfluidic cells.
  • Polydimethylsiloxane (PDMS) is a common material for microfluidic devices, but its surface properties can influence flow dynamics.

Purpose of the Study:

  • To optimize microfluidic cell design for enhanced SPR array detection.
  • To investigate the impact of contact angles on flow uniformity within microfluidic cells.
  • To minimize mass transfer effects for improved detection accuracy.

Main Methods:

  • Finite element simulations were used to model internal flow dynamics.
  • Micro-particle image velocimetry (μPIV) measured flow velocities in Polydimethylsiloxane (PDMS) microfluidic cells.
  • Various microfluidic cell designs with different contact angles were evaluated.

Main Results:

  • A contact angle of 135° was identified as optimal for achieving the most uniform flow distribution.
  • The optimized design significantly enhances capabilities for high-throughput array detection.
  • Experimental results generally aligned with simulation predictions, with minor deviations attributed to fabrication.

Conclusions:

  • Microfluidic cell design optimization, particularly contact angle, is crucial for uniform flow and accurate SPR detection.
  • The 135° contact angle demonstrates superior performance for high-throughput SPR array applications.
  • The study confirms the reliability and repeatability of the optimized microfluidic cells in SPR systems.