Influence of evaporation on the morphology of a thin film of a partially miscible binary mixture

Rabani, Ramin; Sadafi, Hosein; Machrafi, Hatim; Abbasi, Monavar; Haut, Benoit; Dauby, Pierre

doi:10.1016/j.colsurfa.2020.126001

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Influence of evaporation on the morphology of a thin film of a partially miscible binary mixture

Rabani, Ramin; Sadafi, Hosein; Machrafi, Hatim et al.

2020 • In Colloids and Surfaces A: Physicochemical and Engineering Aspects, 612

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https://hdl.handle.net/2268/258156

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10.1016/j.colsurfa.2020.126001

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Keywords :

Evaporation; Thin film; Partially miscible binary mixture; Phase separation morphology; Lateral and lamellar structures; Coalescence

Abstract :

[en] In this paper, we develop numerical, theoretical and experimental analyses of the different morphologies that can be created by the phase separation phenomena that are induced by solvent evaporation in a thin film of a partially miscible binary mixture. Disregarding hydrodynamic effects, the Cahn–Hilliard–Cook and temperature equations are used to describe the thermodynamics of non-isothermal phase separation in a 2D thin film. Numerical simulations are performed to investigate the interplay between evaporation and phase separation and we examine the effect on the morphology of the film of several parameters such as the initial thickness of the layer, or the initial temperature and concentration of the mixture. Interestingly, the competition between evaporation and phase separation is shown to be the main determinant of the choice between a lamellar or a lateral pattern in the beginning of phase separation. For moderate evaporation rate, the spinodal instability takes place close to the evaporating interface and a lateral structure is formed. For stronger evaporation, the spinodal instability does not occur and a lamellar structure is created. In addition, the mid- or long- term evolution of the system is also considered. The thickness of the film is an important parameter in this analysis and possible modifications of the pattern over time are emphasized. Detailed physical and theoretical interpretations are proposed for the results and experiments in a Hele-Shaw cell that nicely confirm our predictions are presented.

Research center :

Thermodynamics of Irreversible Phenomena

Disciplines :

Mechanical engineering

Author, co-author :

Rabani, Ramin ; Université de Liège - ULiège > GIGA

Sadafi, Hosein

Machrafi, Hatim ; Université de Liège - ULiège > GIGA In silico med. - Thermodynamics of Irreversible Proces.

Abbasi, Monavar

Haut, Benoit

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

Language :

English

Title :

Influence of evaporation on the morphology of a thin film of a partially miscible binary mixture

Publication date :

07 December 2020

Journal title :

Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN :

0927-7757

eISSN :

1873-4359

Publisher :

Elsevier, Netherlands

Volume :

612

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.sciencedirect.com/science/article/abs/pii/S0927775720315946

Funders :

F.R.S.-FNRS (“DITRASOL” PDR T.0123.16)

Available on ORBi :

since 18 March 2021

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