Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings

Abstract Colloidal based films have been widely developed for a wide range of applications including chemical and electrical barrier coatings, photonic materials, biomaterials, and pharmaceutical oral drug delivery. Many previous studies investigate methods to generate uniformity or desired stratifi...

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Autores principales:	Thitiporn Kaewpetch, James F. Gilchrist
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e278b16feecc48708cb5df3308f40074
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spelling	oai:doaj.org-article:e278b16feecc48708cb5df3308f400742021-12-02T17:44:55ZChemical vs. mechanical microstructure evolution in drying colloid and polymer coatings10.1038/s41598-020-66875-02045-2322https://doaj.org/article/e278b16feecc48708cb5df3308f400742020-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-66875-0https://doaj.org/toc/2045-2322Abstract Colloidal based films have been widely developed for a wide range of applications including chemical and electrical barrier coatings, photonic materials, biomaterials, and pharmaceutical oral drug delivery. Many previous studies investigate methods to generate uniformity or desired stratification of the final components with a desired microstructure. Few studies have been able to investigate this microstructure in-situ during drying. This experimental study directly tracks fluorescent colloids that are either stable in suspension or have attractive interactions during the drying process using high speed laser scanning confocal microscopy to obtain details of microstructural evolution during drying. The colloidal microstructure in stable suspensions evolves continuously during drying. Microstructures in these systems have a signature Voronoi polyhedra distribution that is defined by lognormal curve having a constant standard deviation that only depends on its chemical composition. Those formulations having strongly attractive constituents have microstructure that is heterogeneous and non-monotonic due to the mechanics associated with internal convection and capillary forces. Toward the end of drying, the influence of the mode of microstructure rearrangements remains evident.Thitiporn KaewpetchJames F. GilchristNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-10 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Thitiporn Kaewpetch James F. Gilchrist Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
description	Abstract Colloidal based films have been widely developed for a wide range of applications including chemical and electrical barrier coatings, photonic materials, biomaterials, and pharmaceutical oral drug delivery. Many previous studies investigate methods to generate uniformity or desired stratification of the final components with a desired microstructure. Few studies have been able to investigate this microstructure in-situ during drying. This experimental study directly tracks fluorescent colloids that are either stable in suspension or have attractive interactions during the drying process using high speed laser scanning confocal microscopy to obtain details of microstructural evolution during drying. The colloidal microstructure in stable suspensions evolves continuously during drying. Microstructures in these systems have a signature Voronoi polyhedra distribution that is defined by lognormal curve having a constant standard deviation that only depends on its chemical composition. Those formulations having strongly attractive constituents have microstructure that is heterogeneous and non-monotonic due to the mechanics associated with internal convection and capillary forces. Toward the end of drying, the influence of the mode of microstructure rearrangements remains evident.
format	article
author	Thitiporn Kaewpetch James F. Gilchrist
author_facet	Thitiporn Kaewpetch James F. Gilchrist
author_sort	Thitiporn Kaewpetch
title	Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
title_short	Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
title_full	Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
title_fullStr	Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
title_full_unstemmed	Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
title_sort	chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/e278b16feecc48708cb5df3308f40074
work_keys_str_mv	AT thitipornkaewpetch chemicalvsmechanicalmicrostructureevolutionindryingcolloidandpolymercoatings AT jamesfgilchrist chemicalvsmechanicalmicrostructureevolutionindryingcolloidandpolymercoatings
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Chemical vs. mechanical microstructure evolution in drying colloid and polymer coatings

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