A One-Square-Millimeter Compact Hollow Structure for Microfluidic Pumping on an All-Glass Chip.

Area of Science:

• Microfluidics
• Materials Science
• Mechanical Engineering

Background:

• Microfluidic pumps are essential for lab-on-a-chip devices but face challenges in miniaturization and practical reliability.
• Existing micro pumps often require complex fabrication and pre-perfusion steps, limiting their widespread adoption.

Purpose of the Study:

• To develop and characterize a novel, compact, all-glass micro surface tension pump.
• To demonstrate a low-cost, easily fabricated microfluidic pump with enhanced reliability and simplified operation.

Main Methods:

• Fabrication of a one-square-millimeter, all-glass microfluidic pump using one-step glass etching.
• Integration of two joint chambers and a piston controlled by two-way digital gas pressure.
• Evaluation of pump performance, including initialization, restart capability, and volumetric output.

Main Results:

• The developed micro surface tension pump operates immediately upon liquid entry without pre-perfusion.
• The pump demonstrated reliable restart capability after bubble formation, a common failure point in conventional micro pumps.
• Achieved a volumetric pump output of 0.5–0.7 nL·s⁻¹ under a 300 Pa pump head pressure.

Conclusions:

• The one-square-millimeter, all-glass micro surface tension pump offers a low-cost, reliable, and user-friendly solution for microfluidic applications.
• Its simplified design and robust restart capability address key limitations of existing micro pump technologies.
• This micro pump is suitable for integration into various microfluidic systems requiring precise liquid handling.