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Bubble pump: scalable strategy for in-plane liquid routing.

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A novel bubble pump design enables long-term, low-flow liquid pumping in microfluidic systems without moving parts. This technology offers scalable manufacturing and compatibility with various materials for diverse lab-on-a-chip applications.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Mechanical Engineering

Background:

  • Microfluidic systems often require precise, long-term liquid handling.
  • Existing micropumps may have limitations in terms of material compatibility, scalability, or reliance on moving parts.

Purpose of the Study:

  • To present a novel on-chip liquid routing technique for active pumping in well-based microfluidic systems.
  • To develop a bubble-actuated pump compatible with scalable manufacturing and diverse substrate materials.

Main Methods:

  • Utilized a single fluidic feature layer and pneumatic control line.
  • Configured two 'bubble gates' in series to direct liquid flow via gas bubbles.
  • Employed a time-dependent pressure signal for the active gate and a constant pressure for the passive gate.

Main Results:

  • Consistently operated the bubble pump with various liquids for over 72 hours.
  • Achieved flow rates from 0-5.5 μl/min, adjustable by design and actuation frequency.
  • Demonstrated scalability in a 12-microchannel format with <7% flow rate variation.

Conclusions:

  • The bubble pump offers a robust, membrane-free solution for active liquid transport in microfluidics.
  • The technology is suitable for applications requiring consistent delivery of diverse liquids, including sensitive solutions.
  • Potential applications include point-of-care diagnostics, cell culture, and organ-on-chip platforms.