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Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2024

Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures

Rotors moléculaires pour la cartographie in situ de la viscosité pendant l'évaporation de mélanges de fluides confinés

Résumé

Numerous formulation processes of materials involve a drying step, during which evaporation of a solvent from a multi-component liquid mixture, often confined in a thin film or in a droplet, lead to concentration and assembly of non volatile compounds. While the basic phenomena ruling evaporation dynamics are known, a precise modeling of practical situations is hindered by the lack of tools for local and time-resolved mapping of concentration fields in such confined systems. In this article, the use of Fluorescence Lifetime Imaging Microscopy and of Fluorescent Molecular Rotors is introduced as a versatile, in-situ and quantitative method to map viscosity and concentration fields in confined, evaporating liquids. More precisely, the cases of drying of a suspended liquid film and of a sessile droplet of mixtures of fructose and water is investigated. Measured viscosity and concentration fields allow to characterize drying dynamics, in agreement with simple modeling of the evaporation process.
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Dates et versions

hal-04446809 , version 1 (08-02-2024)

Identifiants

Citer

Florence Gibouin, Dharshana Nalatamby, Pierre Lidon, Yaocihuatl Medina-Gonzalez. Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures. ACS Applied Materials & Interfaces, 2024, ⟨10.1021/acsami.3c16808⟩. ⟨hal-04446809⟩

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