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Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets

[Image: see text] We study the microstructures in the drying droplets of gelatinized starch solutions on a flat substrate. Cryogenic scanning electron microscopy studies on the vertical cross-section of these drying droplets for the first time reveal a relatively thinner solid elastic crust of unifo...

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Autores principales: Ghosh, Subhadip, Roy, Arun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10249113/
https://www.ncbi.nlm.nih.gov/pubmed/37305248
http://dx.doi.org/10.1021/acsomega.3c02164
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author Ghosh, Subhadip
Roy, Arun
author_facet Ghosh, Subhadip
Roy, Arun
author_sort Ghosh, Subhadip
collection PubMed
description [Image: see text] We study the microstructures in the drying droplets of gelatinized starch solutions on a flat substrate. Cryogenic scanning electron microscopy studies on the vertical cross-section of these drying droplets for the first time reveal a relatively thinner solid elastic crust of uniform thickness at the free surface, an intermediate mesh region below the crust, and an inner core of a cellular network structure made of starch nanoparticles. We find that the deposited circular films formed after drying are birefringent and azimuthally symmetric with a dimple at their center. We propose that the dimple formation in our sample occurs due to the evaporation-induced stress on the gel network structure in the drying droplet. The polarizing optical microscopic studies show that these films are optically uniaxial at their center and increasingly biaxial away from the center.
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spelling pubmed-102491132023-06-09 Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets Ghosh, Subhadip Roy, Arun ACS Omega [Image: see text] We study the microstructures in the drying droplets of gelatinized starch solutions on a flat substrate. Cryogenic scanning electron microscopy studies on the vertical cross-section of these drying droplets for the first time reveal a relatively thinner solid elastic crust of uniform thickness at the free surface, an intermediate mesh region below the crust, and an inner core of a cellular network structure made of starch nanoparticles. We find that the deposited circular films formed after drying are birefringent and azimuthally symmetric with a dimple at their center. We propose that the dimple formation in our sample occurs due to the evaporation-induced stress on the gel network structure in the drying droplet. The polarizing optical microscopic studies show that these films are optically uniaxial at their center and increasingly biaxial away from the center. American Chemical Society 2023-05-22 /pmc/articles/PMC10249113/ /pubmed/37305248 http://dx.doi.org/10.1021/acsomega.3c02164 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Ghosh, Subhadip
Roy, Arun
Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title_full Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title_fullStr Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title_full_unstemmed Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title_short Optical Anisotropy and Dimple Formation on Films Formed after Drying of Gelatinized Starch Solution Droplets
title_sort optical anisotropy and dimple formation on films formed after drying of gelatinized starch solution droplets
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10249113/
https://www.ncbi.nlm.nih.gov/pubmed/37305248
http://dx.doi.org/10.1021/acsomega.3c02164
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