Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866917584735043584 |
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| author | Gibouin, Florence Nalatamby, Dharshana Lidon, Pierre Medina-Gonzalez, Yaocihuatl |
| author_facet | Gibouin, Florence Nalatamby, Dharshana Lidon, Pierre Medina-Gonzalez, Yaocihuatl |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_04728 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures Gibouin, Florence Nalatamby, Dharshana Lidon, Pierre Medina-Gonzalez, Yaocihuatl Soft Condensed Matter Chemical Physics 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. |
| title | Molecular Rotors for In Situ Viscosity Mapping during Evaporation of Confined Fluid Mixtures |
| topic | Soft Condensed Matter Chemical Physics |
| url | https://arxiv.org/abs/2311.04728 |