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Droplet evaporation on soft solid substrates.

Vasileios Charitatos1, Satish Kumar1

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA. kumar030@umn.edu.

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|October 1, 2021
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Summary
This summary is machine-generated.

Softer solid substrates accelerate droplet evaporation by prolonging contact line pinning. This finding, derived from a new lubrication-theory model, aids in understanding droplet dynamics for applications like microlens fabrication.

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Area of Science:

  • Physics
  • Materials Science
  • Chemical Engineering

Background:

  • Droplet evaporation on soft solids is crucial for microlens fabrication and particle deposition.
  • Understanding the dynamics of droplet evaporation on viscoelastic substrates is essential for controlling these processes.

Purpose of the Study:

  • To develop a theoretical model for droplet evaporation on linear viscoelastic solids.
  • To investigate the influence of substrate properties and evaporation rates on droplet behavior.

Main Methods:

  • A lubrication-theory-based model was developed to describe liquid-air and liquid-solid interface evolution.
  • Partial differential equations were solved using a finite-difference method.
  • A disjoining-pressure/precursor-film approach and a one-sided model were employed for contact-line motion and evaporation, respectively.

Main Results:

  • Softer substrates were found to accelerate droplet evaporation.
  • Prolonged contact line pinning on softer substrates was identified as the mechanism for accelerated evaporation.
  • Model results qualitatively matched experimental observations.

Conclusions:

  • The developed model provides fundamental insights into droplet evaporation on soft solids.
  • The model can be extended to more complex scenarios, including particle-laden droplets.
  • Findings are relevant for optimizing fabrication processes involving droplet evaporation.