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On-Chip Droplet Splitting with High Volume Ratios Using a 3D Conical Microstructure-Based Microfluidic Device.

Jian Yu1, Xueqing Kan1, Zhaoyang Xiang1

  • 1Zhejiang Provincial Key Laboratory of Flow Measurement Technology, College of Metrology Measurement and Instrument, China Jiliang University, Hangzhou 310018, China.

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Summary

Researchers developed a microfluidic device using a 3D conical structure to split droplets with precise volume control. This method achieves high splitting ratios up to 265, aiding droplet-based applications.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Analytical Chemistry

Background:

  • Precise control over droplet volume is crucial for many microfluidic applications.
  • Existing methods for droplet splitting often lack high precision or scalability.

Purpose of the Study:

  • To develop a simple microfluidic method for splitting mother droplets into two daughter droplets with high and precise volume ratios.
  • To investigate the factors influencing droplet splitting ratios in a microfluidic device.

Main Methods:

  • Fabrication of a microfluidic device with an embedded three-dimensional (3D) conical microstructure.
  • Experimental investigation of droplet splitting using varying flow rates, injection lengths, and droplet diameters.
  • Numerical simulations to understand the droplet splitting behavior.

Main Results:

  • Achieved high splitting ratios of monodisperse mother droplets, reaching up to 265:1.
  • Identified key parameters affecting splitting ratio: outlet flow rates, conical microstructure injection length, and mother droplet diameter.
  • Validated experimental findings with numerical simulations.

Conclusions:

  • The proposed microfluidic device with a conical microstructure offers precise on-chip droplet volume control.
  • This technology is a powerful tool for droplet-based applications, including viral infectivity assays and sequencing.
  • Enables efficient sample extraction and volume management in microfluidic systems.