Drying Drops of Paint Suspension: From “Fried Eggs” to Quasi-Homogeneous Patterns - Archive ouverte HAL
Article Dans Une Revue Langmuir Année : 2023

Drying Drops of Paint Suspension: From “Fried Eggs” to Quasi-Homogeneous Patterns

Stella Ramos
Rémy Fulcrand
Catherine Barentin
  • Fonction : Auteur
  • PersonId : 1302437

Résumé

Drying of multicomponent sessile drops is a complex phenomenon involving intricate mechanisms. Here, we study the evaporation of drops made of paint suspension and investigate the influence of the substrate temperature and suspension concentration on the resulting deposit patterns. At low concentrations and temperatures, the pigments appear highly concentrated in a narrow area at the center of the drop, a morphology we call “fried eggs”. Increasing the temperature or concentration leads to more homogeneous patterns. From a top-view camera used for monitoring the whole evaporative process, we identify three mechanisms responsible for the final pattern: inward/outward flows that convect the pigments, gelation of the paint suspension where pigments accumulate, and final drying of the drop that freezes the location of the pigments onto the substrate. The relative kinetics of these three mechanisms upon concentration and temperature govern the deposit growth and the morphology of the final pattern. These observations are quantitatively supported by rheological measurements highlighting a strong increase of the viscosity with concentration, consistent with the gelation mechanism. Finally, we show that the kinetics of drop drying is controlled by the substrate temperature.
Fichier non déposé

Dates et versions

hal-04216542 , version 1 (25-09-2023)

Identifiants

Citer

Stella Ramos, Damien Soubeyrand, Rémy Fulcrand, Catherine Barentin. Drying Drops of Paint Suspension: From “Fried Eggs” to Quasi-Homogeneous Patterns. Langmuir, 2023, 39, pp.13579−13587. ⟨10.1021/acs.langmuir.3c01605⟩. ⟨hal-04216542⟩
16 Consultations
0 Téléchargements

Altmetric

Partager

More