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Related Experiment Video

Updated: Aug 22, 2025

Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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Microfluid Switching-Induced Transient Refractive Interface.

Jiukai Tang1,2, Guangyu Qiu1,2,3, Xiaobao Cao4,5

  • 1Institute of Environmental Engineering, ETH Zürich, Zürich8093, Switzerland.

ACS Sensors
|November 10, 2022
PubMed
Summary
This summary is machine-generated.

We developed a novel laminar flow interface (LFI) in a 3D microfluidic chip that acts as a transient refractive interface (TRI). This TRI enables highly sensitive detection of chemical concentrations, improving existing optofluidic sensors.

Keywords:
Poiseuille flowdiffusion coefficientlaminar flow interfacemicrofluid switchingrefractive index

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Area of Science:

  • Microfluidics
  • Optofluidics
  • Analytical Chemistry

Background:

  • Laminar flow interfaces (LFIs) are crucial in microscale flows and optofluidic applications.
  • Traditional LFI generation requires complex hydrodynamic pumping systems.
  • A new LFI generation method is needed for simpler and more efficient optofluidic devices.

Purpose of the Study:

  • To present a novel laminar flow interface (LFI) generated by fluid switching in a 3D microlens-incorporating microfluidic chip (3D-MIMC).
  • To demonstrate the LFI's function as a transient refractive interface (TRI) sensitive to fluid properties.
  • To establish a new optofluidic sensing method with enhanced sensitivity and accuracy.

Main Methods:

  • Fabrication of a 3D-MIMC chip.
  • Generation of cone-like LFIs via fluid switching based on Poiseuille flow.
  • Utilizing the LFI as a TRI to modulate transmitted light intensity.
  • Systematic variation of Péclet number (Pe) and refractive index (RI) of switching fluids.

Main Results:

  • The TRI's intensity modulation is sensitive to RI and Pe.
  • Incorporating 3D microlenses and increasing Pe significantly improved intensity peak profiles.
  • Achieved a limit of detection (LoD) of 0.001% (w/w) for NaCl, a 1-2 order of magnitude improvement.
  • Established a linear correlation between optical response, Pe, and specific RI, enabling estimation of diffusion coefficients.
  • Demonstrated sensitive measurement of optical-equivalent total dissolved solids (OE-TDS) in environmental samples.

Conclusions:

  • The novel LFI generated in 3D-MIMC acts as a sensitive TRI for optofluidic sensing.
  • This method offers significantly improved LoD and accuracy compared to existing techniques.
  • The developed model provides a robust framework for chemical sensing and property estimation in microfluidic systems.