24-27 November 2022
Karlsruhe Institute of Technology
Europe/Berlin timezone

Droplets evaporation on chemically patterned surfaces

26 Nov 2022, 16:00
2h
Foyer (KIT Campus South)

Foyer

KIT Campus South

KIT Campus map: https://www.kit.edu/campusplan/ Building: 30.22 Room: Foyer im 1. und 2. OG Address: Institute of Technology, Engesserstraße 7, 76131 Karlsruhe Coordinates: 49.01244, 8.41062
Poster Physics Posters Poster session

Speaker

Zhang Hongmin (IAM, KIT)

Description

The evaporation of fluids on the different patterned surfaces is omnipresent in nature. A
comprehensive study of the evaporation process coupling with the wetting effect through modeling
will give us a complete understanding of the underlying mechanisms and help us construct a digital
twin, enabling us to control the whole system. The poster is divided into two parts. Firstly, based on
the idea of minimum surface, a theoretical model is established to describe the three-dimensional
droplet shape with straight edges and sharp corners on a polygon-patterned substrate in quasi-
equilibrium state. This kind of setup is widely used in droplet sampling for high-throughput
screening of live cells and chemical reactions. We relate the volume of the shaped-droplet to its
height, aiming to address the challenge of measuring the volume of evaporation droplets with usual
experimental techniques. The proposed model is compared with phase-field simulation and
experiments. Secondly, a Cahn-Hilliard phase field model is utilized to describe the diffusion
dominated evaporation process of multi droplets. Through this model, we investigate the effect of
the key parameters including the humidity, volume, droplet position/distance/numbers, liquid type/
concentration etc. on the evaporation process. Our aim is to identify an optimal condition for
culturing cells and sample preparation on Droplet Microarray (DMA) through the digital twin
system.

Category Solid State (Experiment)

Primary author

Zhang Hongmin (IAM, KIT)

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