A 3D-Printed Micro-Optofluidic Chamber for Fluid Characterization and Microparticle Velocity Detection

Area of Science:

• Microfluidics
• Optofluidics
• Biotechnology
• Optical Engineering

Background:

• Micro-optofluidic (MoF) devices are crucial for analyzing microscale phenomena.
• Traditional methods for particle and fluid analysis often require complex setups and extensive image processing.
• There is a need for faster, cost-effective, and integrated solutions for real-time on-chip analysis.

Purpose of the Study:

• To propose and validate a novel multi-objective polydimethylsiloxane (PDMS) micro-optofluidic (MoF) device.
• To introduce and demonstrate a new signal processing-based velocimetry technique, dual-slit particle signal velocimetry (DPSV), for fluid and microparticle velocity detection.
• To showcase the device's capability for real-time total-on-chip analysis.

Main Methods:

• A 3D-printed master-slave approach was used to fabricate the PDMS MoF device.
• Optical detection techniques were employed within a specialized MoF chamber.
• Dual-slit particle signal velocimetry (DPSV) was developed, focusing on signal processing over image processing.
• Experiments involved testing with various fluids and synthetic microparticles, validated against digital particle image velocimetry (DPIV).

Main Results:

• The fabricated MoF device successfully characterized immiscible fluids and microparticles.
• The DPSV method demonstrated rapid and cost-effective velocity detection, outperforming traditional image-based approaches in speed and setup complexity.
• The device showed multipurpose capabilities with different fluid types and microparticles.
• DPSV effectiveness in estimating microparticle velocities was proven through comparative experiments with DPIV.

Conclusions:

• The integrated MoF device and DPSV approach offer a powerful proof of concept for real-time total-on-chip analysis.
• The DPSV methodology presents a significant advancement by simplifying setups and reducing costs for microfluidic analysis.
• This technology holds promise for various applications requiring rapid, on-demand microscale fluid and particle characterization.