Evaporation induced demixing in binary sessile drops

[en] The interplay between evaporation and liquid-liquid phase separation (demixing) in binary sessile drops of partially miscible liquids is investigated. To determine the onset of the demixing phenomenon, a simple model is developed, which predicts a considerable temperature reduction (∼20°C) in the mixture due to evaporative cooling. Temperature reduction alongside with the change of composition lead to demixing in the mixtures. The model explains why a mixture at room temperature is able to demix, whilst the demixing upper critical temperature is at 6.3 °C. Five stages of the process are identified and explained. For the cases studied here, once the demixing begins through nucleation, a growing fingering pattern is formed at the contact line. The length of the fingers and the final area of deposition increase with the initial concentration. Experimental tests were performed using a double telecentric setup.

Disciplines :

Mechanical engineering

Author, co-author :

Sadafi, Hosein

Rabani, Ramin ; Université de Liège - ULiège > In silico-Model-based therapeutics, Critical Care Basic Sc.

Dehaeck, Sam

Machrafi, Hatim ; Université de Liège - ULiège > In silico medecine-Thermodynamics of Irreversible Processes

Haut, Benoit

Dauby, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles

Colinet, Pierre

Language :

English

Title :

Evaporation induced demixing in binary sessile drops

Publication date :

09 June 2020

Journal title :

Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN :

0927-7757

eISSN :

1873-4359

Publisher :

Elsevier, Netherlands

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.sciencedirect.com/science/article/pii/S0927775720306452?via%3Dihub#!

Available on ORBi :

since 10 June 2020

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