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Electrostatic assist (ESA) improves liquid transfer in printing by modifying liquid bridge dynamics. This technique enhances liquid transfer to more wettable surfaces, reducing defects in printed electronics.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Liquid transfer is crucial for printing processes, but incomplete transfer causes defects in printed electronics.
  • Electrostatic assist (ESA) is a technique to minimize these defects, but its underlying physical mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the physical mechanisms of electrostatic assist (ESA) in liquid transfer.
  • To develop slender-jet models for Newtonian liquid bridges with moving contact lines.

Main Methods:

  • Developed nonlinear partial differential equations for bridge radius and interfacial charge evolution.
  • Solved equations using finite element methods for perfect and leaky dielectric models.
  • Conducted flow visualization experiments to validate model predictions.

Main Results:

  • For perfect dielectrics, ESA enhances liquid transfer to more wettable surfaces by altering pressure differences.
  • For leaky dielectrics, ESA's effect on wettability depends on electric field direction and surface charge.
  • Experiments confirmed ESA's enhancement of liquid transfer due to modified bridge shape and contact line depinning.

Conclusions:

  • ESA effectively improves liquid transfer to more wettable surfaces, crucial for defect reduction in printing.
  • The developed models accurately predict liquid transfer enhancement under ESA.
  • Understanding ESA mechanisms can optimize printed electronic device fabrication.