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High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
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Macrodrop-Impact-Mediated Fluid Microdispensing.

Shiji Lin1, Dehui Wang2, Lijuan Zhang3

  • 1School of Physics, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 26, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel microdispensing technique using liquid jet instability for precise picoliter to nanoliter droplet generation. This low-cost, nozzle-free method efficiently handles diverse liquids for microfluidics and fabrication.

Keywords:
drop impactfluid dispensingjet dynamicsnon-wetting surfaces

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Area of Science:

  • Fluid Dynamics
  • Microfluidics
  • Materials Science

Background:

  • High-resolution fluid dispensing is crucial for digital microfluidics, micro-biosensing, and fabrication.
  • Existing methods often require specialized nozzles, have limited tunability, and struggle with low surface tension or complex liquids.

Purpose of the Study:

  • To develop a facile, low-frequency microdispensing technique.
  • To overcome limitations of current fluid dispensing technologies.

Main Methods:

  • Utilized Rayleigh-Plateau instability of singular liquid jets.
  • Stimulated jets via air cavity collapse from microliter drop impact on non-wetting surfaces.

Main Results:

  • Achieved tunable microdrop volumes from picoliters to nanoliters.
  • Successfully dispensed low-viscosity liquids across a wide surface tension range, including complex formulations.
  • Demonstrated a nozzle-free, low-cost, portable dispensing platform.

Conclusions:

  • The proposed technique offers a versatile and cost-effective solution for microdispensing.
  • Applications include controlled microchemical reactions, biological sample handling, and smart material fabrication.
  • This rational microdrop generator has broad potential across various research fields.