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Semicrystalline Polymer Micro/Nanostructures Formed by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions: Effect of Solution Concentration
[Image: see text] Deposits formed after evaporation of sessile droplets, containing aqueous solutions of poly(ethylene oxide), on hydrophilic glass substrates were studied experimentally and mathematically as a function of the initial solution concentration. The macrostructure and micro/nanostructur...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9753751/ https://www.ncbi.nlm.nih.gov/pubmed/36442152 http://dx.doi.org/10.1021/acs.langmuir.2c01872 |
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author | Kolahgar-Azari, Shadi Kagkoura, Antonia Mamalis, Dimitrios Blackford, Jane R. Valluri, Prashant Sefiane, Khellil Koutsos, Vasileios |
author_facet | Kolahgar-Azari, Shadi Kagkoura, Antonia Mamalis, Dimitrios Blackford, Jane R. Valluri, Prashant Sefiane, Khellil Koutsos, Vasileios |
author_sort | Kolahgar-Azari, Shadi |
collection | PubMed |
description | [Image: see text] Deposits formed after evaporation of sessile droplets, containing aqueous solutions of poly(ethylene oxide), on hydrophilic glass substrates were studied experimentally and mathematically as a function of the initial solution concentration. The macrostructure and micro/nanostructures of deposits were studied using stereo microscopy and atomic force microscopy. A model, based on thin-film lubrication theory, was developed to evaluate the deposit macrostructure by estimating the droplet final height. Moreover, the model was extended to evaluate the micro/nanostructure of deposits by estimating the rate of supersaturation development in connection with the driving force of crystallization. Previous studies had only described the macrostructure of poly(ethylene oxide) deposits formed after droplet evaporation, whereas the focus of our study was the deposit micro/nanostructures. Our atomic force microscopy study showed that regions close to the deposit periphery were composed of predominantly semicrystalline micro/nanostructures in the form of out-of-plane lamellae, which require a high driving force of crystallization. However, deposit central areas presented semicrystalline micro/nanostructures in the form of in-plane terraces and spirals, which require a lower driving force of crystallization. Increasing the initial concentration of solutions led to an increase in the lengths and thicknesses of the out-of-plane lamellae at the deposits’ periphery and enhanced the tendency to form spirals in the central areas. Our numerical study suggested that the rate of supersaturation development and thus the driving force of crystallization increased from the center toward the periphery of droplets, and the supersaturation rate was lower for solutions with higher initial concentrations at each radius. Therefore, periphery areas of droplets with lower initial concentrations were suitable for the formation of micro/nanostructures which require higher driving forces, whereas central areas of droplets with higher initial concentration were desirable for the formation of micro/nanostructures which require lower driving forces. These numerical results were in good qualitative agreement with the experimental findings. |
format | Online Article Text |
id | pubmed-9753751 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-97537512022-12-16 Semicrystalline Polymer Micro/Nanostructures Formed by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions: Effect of Solution Concentration Kolahgar-Azari, Shadi Kagkoura, Antonia Mamalis, Dimitrios Blackford, Jane R. Valluri, Prashant Sefiane, Khellil Koutsos, Vasileios Langmuir [Image: see text] Deposits formed after evaporation of sessile droplets, containing aqueous solutions of poly(ethylene oxide), on hydrophilic glass substrates were studied experimentally and mathematically as a function of the initial solution concentration. The macrostructure and micro/nanostructures of deposits were studied using stereo microscopy and atomic force microscopy. A model, based on thin-film lubrication theory, was developed to evaluate the deposit macrostructure by estimating the droplet final height. Moreover, the model was extended to evaluate the micro/nanostructure of deposits by estimating the rate of supersaturation development in connection with the driving force of crystallization. Previous studies had only described the macrostructure of poly(ethylene oxide) deposits formed after droplet evaporation, whereas the focus of our study was the deposit micro/nanostructures. Our atomic force microscopy study showed that regions close to the deposit periphery were composed of predominantly semicrystalline micro/nanostructures in the form of out-of-plane lamellae, which require a high driving force of crystallization. However, deposit central areas presented semicrystalline micro/nanostructures in the form of in-plane terraces and spirals, which require a lower driving force of crystallization. Increasing the initial concentration of solutions led to an increase in the lengths and thicknesses of the out-of-plane lamellae at the deposits’ periphery and enhanced the tendency to form spirals in the central areas. Our numerical study suggested that the rate of supersaturation development and thus the driving force of crystallization increased from the center toward the periphery of droplets, and the supersaturation rate was lower for solutions with higher initial concentrations at each radius. Therefore, periphery areas of droplets with lower initial concentrations were suitable for the formation of micro/nanostructures which require higher driving forces, whereas central areas of droplets with higher initial concentration were desirable for the formation of micro/nanostructures which require lower driving forces. These numerical results were in good qualitative agreement with the experimental findings. American Chemical Society 2022-11-28 2022-12-13 /pmc/articles/PMC9753751/ /pubmed/36442152 http://dx.doi.org/10.1021/acs.langmuir.2c01872 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Kolahgar-Azari, Shadi Kagkoura, Antonia Mamalis, Dimitrios Blackford, Jane R. Valluri, Prashant Sefiane, Khellil Koutsos, Vasileios Semicrystalline Polymer Micro/Nanostructures Formed by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions: Effect of Solution Concentration |
title | Semicrystalline
Polymer Micro/Nanostructures Formed
by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions:
Effect of Solution Concentration |
title_full | Semicrystalline
Polymer Micro/Nanostructures Formed
by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions:
Effect of Solution Concentration |
title_fullStr | Semicrystalline
Polymer Micro/Nanostructures Formed
by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions:
Effect of Solution Concentration |
title_full_unstemmed | Semicrystalline
Polymer Micro/Nanostructures Formed
by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions:
Effect of Solution Concentration |
title_short | Semicrystalline
Polymer Micro/Nanostructures Formed
by Droplet Evaporation of Aqueous Poly(ethylene oxide) Solutions:
Effect of Solution Concentration |
title_sort | semicrystalline
polymer micro/nanostructures formed
by droplet evaporation of aqueous poly(ethylene oxide) solutions:
effect of solution concentration |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9753751/ https://www.ncbi.nlm.nih.gov/pubmed/36442152 http://dx.doi.org/10.1021/acs.langmuir.2c01872 |
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