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Review on pneumatic operations in centrifugal microfluidics
J F Hess1, S Zehnle2, P Juelg2
1Laboratory for MEMS Applications, Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.
Lab on a Chip
|October 10, 2019
Summary
Combining centrifugal microfluidics with pneumatic forces overcomes limitations in fluid transport and control. This integration enables complex, automated laboratory workflows with precise liquid handling and sequential operations.
Area of Science:
- Biotechnology
- Microfluidics
- Analytical Chemistry
Background:
- Centrifugal microfluidics offers miniaturization and automation but is limited by radial flow.
- Complex workflows require additional actuation for pumping, valving, and switching.
Purpose of the Study:
- To review and discuss the integration of centrifugal and pneumatic forces in microfluidic systems.
- To demonstrate how this combination enables advanced fluid handling and automated workflows.
Main Methods:
- Review of methods for generating pneumatic pressures.
- Examination of unit operations and applications utilizing pneumatics in centrifugal systems.
- Tutorials on designing pneumatic siphon valves and cascaded pneumatic operations.
Main Results:
- Pneumatic forces enable bidirectional liquid transport, actuation for valving/switching, mixing, and precise metering.
- Pneumatics facilitates sequential and cascaded operations for complex timing.
- Monolithic fluidic networks with simple structures are achievable without coatings.
Conclusions:
- The combination of centrifugal and pneumatic actuation is a key technology for robust automation.
- This approach facilitates compact and precise automation of biochemical analysis.
- Low manufacturing demands and robust fluidic networks are key advantages.
