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Three-dimensional Printing of Thermoplastic Materials to Create Automated Syringe Pumps with Feedback Control for Microfluidic Applications

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High-pressure needle interface for thermoplastic microfluidics.

C F Chen¹, J Liu, L P Hromada

¹Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.

|February 12, 2009

Summary

This summary is machine-generated.

A new fluidic interface for thermoplastic microfluidics offers robust, low dead volume connections. This technology enables high-pressure applications like liquid chromatography with minimal dispersion.

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Area of Science:

Microfluidics
Materials Science
Mechanical Engineering

Background:

Thermoplastic microfluidics are widely used but often limited by fluidic interface performance.
Existing interfaces can suffer from high dead volumes, dispersion, and limited pressure tolerance.
Robust and low-dead-volume interfaces are crucial for advanced microfluidic applications.

Purpose of the Study:

To develop and demonstrate a novel, robust, and low dead volume world-to-chip fluidic interface for thermoplastic microfluidics.
To ensure compatibility with high-pressure applications and minimize fluid dispersion.
To provide an epoxy-free interface solution for demanding microfluidic systems.

Main Methods:

Development of a fluidic port utilizing a stainless steel needle inserted into a mating hole with an interference fit.
Demonstration of a self-tapping threaded needle design for fluidic connections.
Seating of flat-bottomed needle ports directly against the microchannel substrate to minimize interfacial dead volume.
Evaluation of fluid dispersion using dye band passage through the interfaces.

Main Results:

The developed interface exhibits robust performance with low interfacial dead volumes.
Both interference fit and self-tapping threaded needle designs demonstrated effective high-pressure fluidic connections.
Low dispersion was observed for fluidic samples passing through the interface.
The epoxy-free interfaces demonstrated compatibility with internal microchannel pressures exceeding 40 MPa.

Conclusions:

A robust and low dead volume world-to-chip interface for thermoplastic microfluidics has been successfully developed.
The interface is suitable for high-pressure applications, including liquid chromatography, due to its pressure resistance and low dispersion.
The novel design overcomes limitations of existing interfaces, enabling advanced microfluidic system development.