Fluid control in microfluidic devices using a fluid conveyance extension and an absorbent microfluidic flow modulator

Area of Science:

• Microfluidics
• Fluid Dynamics
• Biotechnology

Background:

• Traditional microfluidic systems often rely on complex and bulky components like valves and pumps for fluid control.
• The absence of precise, passive flow regulation methods limits the versatility and scalability of microfluidic devices.

Purpose of the Study:

• To present a simple, valve- and pump-free method for controlling fluid flow in microfluidic devices.
• To demonstrate the precise regulation of fluid flow rates using capillary action and absorbent materials.
• To showcase the applicability of this method in microfluidic functions such as sheath flow and fluid switching.

Main Methods:

• A fluid conveyance extension was fluidly coupled to the outlet chamber of a microfluidic device.
• Capillary action was utilized by contacting an absorbent microfluidic flow modulator with the fluid conveyance extension.
• Fluid flow rate was controlled by matching the absorption rate of the modulator to the fluid coupling.

Main Results:

• A simple, passive fluid control method was successfully developed for microfluidic devices.
• Fluid flow rate was precisely controlled by the absorption rate of the microfluidic flow modulator.
• Demonstrated applications included sheath flow and fluid switching, highlighting the method's versatility.

Conclusions:

• The developed method offers a valve- and pump-free approach to fluid control in microfluidics.
• Precise flow rate regulation is achievable by selecting absorbent microfluidic flow modulators with specific characteristics.
• This technique provides a simplified and potentially more cost-effective solution for microfluidic system design and operation.