Understanding the formation of particle bands and fingering patterns during evaporation of a sessile droplet containing colloids

Appurva Tiwari, Sehyun Shin, Seong Jae Lee, Ashish Kumar Thokchom

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Sessile droplets containing dispersed colloids evaporate on substrates leaving distinct deposition patterns. Applications using the droplets technique require a critical understanding of the complex particle dynamics that affect the deposition pattern. The fingering-like pattern formed when surfactant-laden droplets containing dispersed colloids evaporate is not yet well understood. The lateral imbalanced capillary meniscus forces (CMFs) between particles moving along the Marangoni vortex (MV) cluster particles into bands that deposit to form the fingering-like pattern. This work investigates the effect of particle shape, particle, and surfactant concentration on the phenomenon. Further, the importance of the contact angle and contact line (CL) dynamics of the droplet is also discussed. The results demonstrate that manipulating these parameters can control the band formation and the resulting deposition pattern. The findings of this work would be pivotal for a critical understanding of particle self-assembly and pattern morphologies of evaporating surfactant-laden droplets.

Original languageEnglish
Article number100740
JournalColloids and Interface Science Communications
Volume56
DOIs
Publication statusPublished - 2023 Sept

Bibliographical note

Funding Information:
Shiv Nadar Institution of Eminence Deemed to be University, Greater Noida, India, supported this research. SJL acknowledges the support by the National Research Foundation of Korea ( NRF-2018R1A5A1024127 ).

Publisher Copyright:
© 2023 The Authors

Keywords

  • Capillary meniscus forces
  • Coffee ring effect
  • Marangoni vortex
  • Particle bands
  • Surfactant

ASJC Scopus subject areas

  • Biotechnology
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry
  • Materials Chemistry

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