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Related Experiment Videos

Altering the coffee-ring effect by adding a surfactant-like viscous polymer solution.

Changdeok Seo1, Daeho Jang1, Jongjin Chae1

  • 1School of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea.

Scientific Reports
|March 31, 2017
PubMed
Summary
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Adding Polyethylene glycol (PEG) to evaporating droplets prevents the coffee-ring effect, enabling uniform particle deposition. This method creates multi-ring patterns beneficial for biomedical applications.

Area of Science:

  • Colloid and surface science
  • Biomaterials engineering

Background:

  • Achieving uniform deposition of suspended particles from evaporating droplets is crucial for various scientific and technological applications.
  • The coffee-ring effect, a phenomenon where particles accumulate at the droplet edge, typically hinders uniform deposition.

Purpose of the Study:

  • To investigate the use of Polyethylene glycol (PEG) as a surfactant-like polymer to mitigate the coffee-ring effect.
  • To achieve a more uniform deposition of microparticles from evaporating droplets, resulting in a multi-ring pattern.

Main Methods:

  • Analysis of microparticle movement and deposition patterns in evaporating droplets using microscopic imaging and video analysis.
  • Utilizing biocompatible Polyethylene glycol (PEG) in droplet formulations.

Related Experiment Videos

Main Results:

  • Polyethylene glycol (PEG) altered droplet surface tension, inducing a centripetal Marangoni flow that counteracted the coffee-ring effect.
  • The interplay between surface tension gradients and evaporation led to the formation of a Marangoni vortex.
  • Periodic pinning-depinning processes during evaporation resulted in the regular formation of multiple deposition rings.

Conclusions:

  • Incorporating a surfactant-like viscous polymer, such as PEG, into droplets offers a viable strategy for uniform particle coating.
  • This technique is highly applicable for coating suspended particles like cells and biomaterials, essential for droplet-based biomedical assays.