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Droplet Printing Enabled by Cavity Collapse Ejection.

Xiaojie Wang1,2, Xin Yang1,2, Yiming Wang1,2

  • 1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 7, 2023
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Summary

Cavity collapse ejection in liquids enables new droplet printing. This technology produces satellite-free, nanoliter droplets from millimeter nozzles, reducing clogging and enabling high-concentration nanoparticle ink printing.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Materials science

Background:

  • Cavity collapse in liquids is crucial for many natural and industrial processes.
  • Utilizing cavity collapse ejection for on-demand droplet printing remains a significant challenge.
  • Existing droplet printing methods face limitations, including nozzle clogging and satellite droplet formation.

Purpose of the Study:

  • To investigate the cavity collapse ejection phenomenon at the submillimeter to millimeter scale.
  • To identify critical factors influencing the jetting behavior during cavity collapse.
  • To develop a novel droplet printing technology based on cavity collapse ejection.

Main Methods:

  • Experimental investigation of cavity collapse dynamics in liquids.
  • Analysis of the role of capillary energy in jet formation.
  • Development and testing of a droplet printing system utilizing cavity collapse ejection.

Main Results:

  • Cavity capillary energy was identified as a critical factor governing the generated jet's state.
  • A new droplet printing technology was developed, capable of producing nanoliter, satellite-free droplets.
  • The technology successfully printed nanoparticle suspensions with 60% mass loading and various functional inks.

Conclusions:

  • Cavity collapse ejection is a viable mechanism for advanced droplet printing.
  • The developed technology overcomes nozzle clogging issues and produces high-quality droplets.
  • This printing method shows broad applicability in bioassays, electronics, and additive manufacturing.