Chip-integrated non-mechanical microfluidic pump driven by electrowetting on dielectrics.

Area of Science:

• Microfluidics
• MEMS
• Electrowetting

Background:

• Microfluidic systems require precise fluid manipulation.
• Existing micropumps often involve complex mechanical parts or assembly.
• Electrowetting-on-dielectric (EWOD) offers a promising actuation mechanism for microscale devices.

Purpose of the Study:

• To develop and characterize a novel microfluidic pump based on the EWOD effect.
• To demonstrate a pump design with no moving components for simplified fabrication and integration.
• To achieve significant flow rates and pressures suitable for lab-on-a-chip applications.

Main Methods:

• Fabrication of a microfluidic pump using conventional microsystems technology.
• Integration of approximately 10^6 microcavities for flow generation via EWOD.
• Utilizing passive, non-mechanical Tesla valves for flow rectification.
• Characterization of pump performance, including voltage and frequency dependence.

Main Results:

• The microfluidic pump operates without any moving components.
• Achieved a continuous flow rate exceeding 0.2 ml min⁻¹.
• Generated a maximum pump pressure greater than 12 mbar.
• Demonstrated cost-effective wafer-level mass production capability.

Conclusions:

• The developed EWOD-based microfluidic pump offers a robust and scalable solution.
• The design facilitates direct integration into microfluidic and lab-on-a-chip platforms.
• The technology enables efficient, low-cost fluid handling for various microscale applications.