Simple Model of Shape Evolution of Desiccated Colloidal Sessile Drop

TL;DR

This paper presents a simple model for the shape evolution of desiccated colloidal sessile drops, accurately capturing phase boundary dynamics and final deposit shape based on mass conservation and flow restrictions.

Contribution

It introduces a novel, straightforward model that effectively describes both the internal phase boundary evolution and the final dried shape of colloidal drops.

Findings

Model accurately predicts phase boundary evolution.

Model correctly reproduces final deposit shape.

Assumes deposit prevents flow and evaporation.

Abstract

We propose simple model of colloidal sessile drop desiccation. The model describes correctly both evolution of the phase boundary between sol and gel inside such a drop and the final shape of the dried film (deposit). The model is based on mass conservation and natural assumption that deposit (gel phase) prevents flows and evaporation.