par Sadafi, Hosein;Rabani, Ramin;Dehaeck, Sam 
;Machrafi, Hatim;Haut, Benoît ;Dauby, Pierre;Colinet, Pierre
Référence Colloids and surfaces. A, Physicochemical and engineering aspects, 602, 125052
Publication Publié, 2020-10-01
;Machrafi, Hatim;Haut, Benoît ;Dauby, Pierre;Colinet, Pierre Référence Colloids and surfaces. A, Physicochemical and engineering aspects, 602, 125052
Publication Publié, 2020-10-01
Article révisé par les pairs
| Résumé : | 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. |
