Dynamical Clustering and Band Formation of Particles in a Marangoni Vortexing Droplet

Ashish Kumar Thokchom, Sehyun Shin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Drying a droplet containing microparticles results in the deposition of particles in various patterns, including the so-called "coffee-ring" pattern. The particle deposition is dependent on the internal flow dynamics, such as the capillary flow and Marangoni vortex (MV), of the droplet. Particle migration and self-assembly on a substrate are interesting phenomena that have critical implications in many applications such as inkjet printing, coating, and many other droplet-based industrial processes. In this work, we observed the formation of bands of particles in a rotating MV during the evaporation of a water droplet containing particles. We investigated the mechanism underlying the formation of banded MV caused by capillary meniscus forces between two particles near the air-liquid interface. In particular, we show that the banded MV can be manipulated by tuning the surfactant concentration and particle concentration. Our findings would provide a new direction in understanding the particle deposition pattern of a colloidal droplet.

Original languageEnglish
JournalLangmuir
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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