Analytical performance of polymer-based microfluidic devices fabricated by computer numerical controlled machining

Area of Science:

• Microfluidics
• Analytical Chemistry
• Materials Science

Background:

• Microfluidic devices, or lab-on-a-chip (LOC) systems, are crucial for miniaturized analytical processes.
• Fabrication methods for microchips influence their performance and accessibility for researchers.
• Current methods like LIGA molding and commercial chip production can be costly and time-consuming.

Purpose of the Study:

• To compare the electrophoretic separation performance of microchips fabricated using masters from conventional CNC machining with commercial, wire imprinted, and LIGA-molded microchips.
• To evaluate the analytical utility of CNC-fabricated microchips using fluorescence microscopy and electrophoresis.
• To highlight the advantages of CNC machining for rapid prototyping of thermoplastic microchips.

Main Methods:

• Fabrication of microchip masters using conventional Computer Numerical Control (CNC) machining.
• Molding of thermoplastic microchips from CNC-machined masters.
• Electrophoretic separation experiments conducted on various microchips (CNC, commercial, wire imprinted, LIGA).
• Analysis of separation performance using a fluorescence microscopy-based detection system.

Main Results:

• Electrophoretic separation performance of CNC microchips was found to be comparable to commercially available microchips.
• Performance of CNC microchips was also comparable to microchips fabricated from LIGA masters.
• Wire imprinted microchips showed different performance characteristics (implied).
• CNC machining offers rapid design-to-device turnaround times.

Conclusions:

• Conventional CNC machining is a viable, low-cost method for fabricating masters for thermoplastic microchips.
• This approach accelerates the development of polymer-based lab-on-a-chip devices.
• CNC machining provides a new, accessible entry point for researchers in the microfluidics field.