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Innovative Hydrophobic Valve Allows Complex Liquid Manipulations in a Self-Powered Channel-Based Microfluidic Device
Francesco Dal Dosso1, Lisa Tripodi1, Dragana Spasic1
1Department of Biosystems, Biosensors Group , KU Leuven , Willem de Croylaan 42 , Box 2428, 3001 Leuven , Belgium.
ACS Sensors
|February 27, 2019
Summary
A novel hydrophobic valve made from treated filter paper enables complex liquid control in self-powered microfluidic devices. This innovation is crucial for developing advanced point-of-care (POC) platforms.
Area of Science:
- Microfluidics
- Materials Science
- Biotechnology
Background:
- Microfluidic devices require precise liquid handling for complex assays.
- Self-powered platforms offer advantages in point-of-care (POC) applications.
- Existing valves can be complex or limit device functionality.
Purpose of the Study:
- To develop a simple, versatile hydrophobic valve for self-powered microfluidic systems.
- To demonstrate the valve's utility in demanding POC applications.
- To integrate the valve with existing self-powered platforms for enhanced capabilities.
Main Methods:
- Fabrication of hydrophobic valves using filter paper treated with a fluorinated compound (Aquapel).
- Characterization of valve properties, including superhydrophobicity (contact angle up to 155°) and liquid pressure resistance (up to 9 kPa).
- Integration of valves into self-powered microfluidic platforms (SIMPLE and iSIMPLE) for liquid manipulation.
Main Results:
- The hydrophobic valve exhibits superhydrophobic properties and high liquid pressure resistance while maintaining gas permeability.
- Integration with iSIMPLE pumps ensured fail-proof activation.
- Valves functioned as both barriers and vents, enabling sample splitting for multiplex analysis.
- Achieved complex liquid shuttling in a self-powered system after a single user activation.
Conclusions:
- The developed hydrophobic valve is a key component for robust, self-powered microfluidic POC systems.
- This innovation facilitates complex bioassays on autonomous platforms with minimal user intervention.
- The valve's simplicity, cost-effectiveness, and performance make it ideal for advanced POC diagnostics.
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