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Thermal Measurement Techniques in Analytical Microfluidic Devices
Published on: June 3, 2015
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Thermally programmable time delay switches for multi-step assays in paper-based microfluidics.
Saeed Atabakhsh1, Hossein Haji Abbasali2, Shahin Jafarabadi Ashtiani2
1Department of Electrical Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran.
Talanta
|January 31, 2024
Summary
This study introduces a novel thermally programmable time-delay switch for paper-based microfluidic devices. This innovation enables controlled fluid delays, automating complex diagnostic assays for point-of-care applications.
Area of Science:
- Microfluidics
- Analytical Chemistry
- Materials Science
Background:
- Paper-based microfluidic devices (μPADs) are cost-effective for point-of-care diagnostics.
- Controlling fluid actuation in complex, multi-step μPAD assays remains a significant challenge.
Purpose of the Study:
- To develop a novel thermally programmable time-delay switch (TPTDS) for precise fluid control in μPADs.
- To automate sequential reagent delivery in microfluidic diagnostic assays.
Main Methods:
- Screen-printed wax micro-bridges were fabricated on μPADs.
- An electrical power feedback loop controlled micro-bridge temperature, melting wax to create time delays.
- The TPTDS was integrated into a nitrate assay, with colorimetric detection used for quantification.
Main Results:
- The TPTDS successfully created programmable time delays by controlling wax penetration depth.
- Automated sequential reagent delivery was achieved for the nitrate assay.
- Colorimetric detection provided quantifiable results, demonstrating assay functionality.
Conclusions:
- The TPTDS offers a robust method for fluid control in paper-based microfluidics.
- This technology enhances the automation capabilities of μPADs for complex diagnostic applications.
- The TPTDS is a promising advancement for point-of-care diagnostics.
