Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures
| Autor: | Gibouin, Florence, Nalatamby, Dharshana, Lidon, Pierre, Medina-Gonzalez, Yaocihuatl |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | ACS Applied Materials & Interfaces (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acsami.3c16808 |
| Popis: | 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. Comment: In press, this version has a bit more detailed set of reference compared to published article |
| Databáze: | arXiv |
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