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Programmable Generation of Droplet Array with Volumetric Gradient by Modulating the Smearing Velocity.

Wei Wang1, Shangzhe Xu1,2, Qijun Cai1,3

  • 1School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, Shaanxi Province, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 3, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a novel droplet-array dispensing platform for programmable generation of droplet arrays with tunable volumes. The system offers a versatile and resource-efficient solution for microfluidic applications.

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Area of Science:

  • Microfluidics
  • Materials Science
  • Biotechnology

Background:

  • Droplet-array microreactors are crucial for high-throughput, low-consumption microfluidic platforms.
  • Femtosecond laser engraving creates hydrophilic sites on hydrophobic substrates for droplet manipulation.

Purpose of the Study:

  • To develop a smearing-driven droplet array dispensing platform for programmable generation of droplet arrays with tunable volume gradients.
  • To enable real-time control of droplet volume distribution and reduce reliance on complex equipment.

Main Methods:

  • Utilizing a smearing-driven platform with hydrophilic sites engraved by femtosecond laser.
  • Implementing a rotational platform to exploit radial velocity for generating volume gradients.
  • Programming smearing velocity and utilizing radial position for volume control.

Main Results:

  • Demonstrated a 100-fold increase in droplet volume with tunable gradients.
  • Achieved predictable scaling of droplet volume with smearing velocity and radial position.
  • Decoupled droplet volume from fixed pattern dimensions, simplifying gradient programming.

Conclusions:

  • The developed platform provides a versatile, resource-efficient solution for droplet-based microfluidics.
  • Potential applications include point-of-care diagnostics, combinatorial assays, and high-throughput screening.
  • The system eliminates dependencies on complex external facilities for gradient generation.