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Liquid marble coalescence via vertical collision.

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This study reveals critical conditions for liquid marble coalescence during vertical collisions. Understanding these mechanisms, involving coating pore opening, is key for digital microfluidics applications.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Microfluidics

Background:

  • Liquid marbles are essential for digital microfluidics.
  • Coalescence mechanisms and conditions are not fully understood.

Purpose of the Study:

  • Investigate liquid marble coalescence via vertical collision.
  • Determine critical conditions for successful coalescence.

Main Methods:

  • Used dielectrophoretic handling to control marble collision.
  • Recorded and analyzed high-speed video of collisions.
  • Varied marble volume, impact velocity, and offset ratio.

Main Results:

  • Coalescence occurs via the coating pore opening mechanism.
  • Quantified liquid neck radius change and marble deformation.
  • Described particle redistribution and ejection during coalescence.

Conclusions:

  • Summarized critical conditions for liquid marble coalescence.
  • Provides a framework for using liquid marbles as microreactors and micromixers.