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Fingering inside the coffee ring.

Byung Mook Weon¹, Jung Ho Je

¹X-ray Imaging Center, Department of Materials Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, Korea. bmweon@hotmail.com

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Summary

This summary is machine-generated.

Evaporation of colloidal droplets with micro- and nanoparticles can form fingering patterns inside the coffee ring. This occurs due to a competition between coffee-ring flow and Marangoni effects in bidispersed mixtures.

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Area of Science:

Colloid science
Fluid dynamics
Materials science

Background:

Colloidal droplets containing micro- and nanoparticles typically form a ring-like stain, known as the "coffee ring," upon evaporation.
The deposition patterns of colloidal particles are influenced by various physical phenomena during droplet evaporation.

Purpose of the Study:

To investigate the emergence of fingering patterns during the evaporation of bidispersed colloidal droplets.
To elucidate the underlying mechanisms driving finger formation within the coffee ring structure.

Main Methods:

Microscopic observation of evaporating bidispersed colloidal droplets (micro- and nanoparticles).
Analysis of fluid flow dynamics and interfacial tension effects during evaporation.

Main Results:

Fingering patterns were observed to emerge during the evaporation process inside the coffee ring.
Finger formation is attributed to the interplay between outward coffee-ring flow and inward Marangoni flow.
The phenomenon is particularly evident when the outward coffee-ring flow dominates the inward Marangoni flow.

Conclusions:

The study reveals a novel fingering instability within the coffee ring of evaporating bidispersed colloidal droplets.
Understanding the competition between coffee-ring and Marangoni effects is crucial for predicting final deposition patterns.
This finding contributes to a deeper comprehension of colloidal deposition and pattern formation.