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The control of dry-out patterns using bubble-containing droplets.

Jiaxin Tang1, Yanguang Shan2, Youhua Jiang3

  • 1School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Department of Mechanical Engineering, Guangdong Technion - Israel Institute of Technology, Shantou, Guangdong 515063, China.

Journal of Colloid and Interface Science
|May 2, 2023
PubMed
Summary

Adding bubbles to evaporating nanofluid droplets creates ring-like deposits. Bubble size and lifetime control deposit morphology, offering a simple method for self-assembly applications.

Keywords:
Bubble-containing dropletContact lineDry-out patternEvaporationNanofluids

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Area of Science:

  • Fluid dynamics
  • Nanomaterials science
  • Surface science

Background:

  • Evaporation of droplets containing nanoparticles is crucial for self-assembly.
  • Understanding droplet behavior during evaporation is key to controlling deposit patterns.

Purpose of the Study:

  • To investigate how internal bubbles influence the dry-out patterns of evaporating nanofluid droplets.
  • To determine if bubble characteristics can be used to tune the morphology of deposit patterns.

Main Methods:

  • Introducing bubbles of varying diameters and lifetimes into nanofluid droplets.
  • Systematically altering nanoparticle properties (type, size, concentration, shape, wettability).
  • Measuring the geometric dimensions of the resulting dry-out patterns.

Main Results:

  • A long-lifetime bubble leads to a complete ring-like deposit.
  • Ring diameter and thickness are dependent on bubble base diameter.
  • Ring completeness decreases with shorter bubble lifetimes.
  • Particle pinning of the contact line near the bubble perimeter drives ring formation.

Conclusions:

  • Bubble presence and characteristics are primary determinants of dry-out patterns in evaporating nanofluid droplets.
  • This study presents a simple, cost-effective method to produce and control ring-like deposits.
  • The findings are applicable to various evaporative self-assembly applications.