Work

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

Year: 2023

Type: article

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.

Source: Colloids and Interface Science Communications

DOI: 10.1016/j.colcom.2023.100740

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

Institutions: Korea University, University of Suwon

Language: English

Topic: Fluid Dynamics and Thin Films

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,250

Funders: National Research Foundation of Korea, Shiv Nadar University