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A Parametric Study on a Paper-Based Bi-Material Cantilever Valve
Hojat Heidari-Bafroui1, Ashutosh Kumar1, Amer Charbaji1
1Microfluidics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, 2 East Alumni Avenue, Kingston, RI 02881, USA.
Micromachines
|September 23, 2022
Summary
This study introduces the Bi-Material Cantilever (B-MaC) valve for precise fluid control in paper-based microfluidics. Key parameters like paper type and humidity significantly impact valve function and fluid flow rates.
Area of Science:
- Microfluidics
- Biomaterials Science
- Chemical Sensing
Background:
- Paper-based microfluidic devices are crucial for biological and chemical sensing.
- Accurate fluid handling is essential for reliable device operation.
- The Bi-Material Cantilever (B-MaC) valve offers autonomous fluid reagent loading and control.
Purpose of the Study:
- To conduct a parametric study on the Bi-Material Cantilever (B-MaC) valve.
- To evaluate the influence of geometric parameters and environmental factors on B-MaC functionality.
- To understand fluid flow rates and cantilever deflection for optimized microfluidic device design.
Main Methods:
- Extensive parametric study of B-MaC valve.
- Evaluation of geometric parameters: paper direction, cantilever width, paper type, tape type, sample volume.
- Assessment of environmental factors: relative humidity and temperature.
Main Results:
- Machine direction, cantilever width, paper type, and tape type significantly affect B-MaC activation time.
- Fluid imbibition rate is sensitive to humidity changes at high (55°C) and low (25°C) temperatures, but not at 45°C.
- A 4 mm gap is needed to prevent premature activation under high humidity (>90%) and low temperature (<35°C).
Conclusions:
- The B-MaC valve's performance is critically dependent on specific geometric and environmental parameters.
- Understanding these parameters is vital for designing effective point-of-care microfluidic paper-based devices.
- The B-MaC valve enables sequential reagent loading in fluidic circuits for advanced sensing applications.
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