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Aerogels from Chitosan Solutions in Ionic Liquids

Chitosan aerogels conjugates the characteristics of nanostructured porous materials, i.e., extended specific surface area and nano scale porosity, with the remarkable functional properties of chitosan. Aerogels were obtained from solutions of chitosan in ionic liquids (ILs), 1-butyl-3-methylimidazol...

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Autores principales: Santos-López, Gonzalo, Argüelles-Monal, Waldo, Carvajal-Millan, Elizabeth, López-Franco, Yolanda L., Recillas-Mota, Maricarmen T., Lizardi-Mendoza, Jaime
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418601/
https://www.ncbi.nlm.nih.gov/pubmed/30966024
http://dx.doi.org/10.3390/polym9120722
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author Santos-López, Gonzalo
Argüelles-Monal, Waldo
Carvajal-Millan, Elizabeth
López-Franco, Yolanda L.
Recillas-Mota, Maricarmen T.
Lizardi-Mendoza, Jaime
author_facet Santos-López, Gonzalo
Argüelles-Monal, Waldo
Carvajal-Millan, Elizabeth
López-Franco, Yolanda L.
Recillas-Mota, Maricarmen T.
Lizardi-Mendoza, Jaime
author_sort Santos-López, Gonzalo
collection PubMed
description Chitosan aerogels conjugates the characteristics of nanostructured porous materials, i.e., extended specific surface area and nano scale porosity, with the remarkable functional properties of chitosan. Aerogels were obtained from solutions of chitosan in ionic liquids (ILs), 1-butyl-3-methylimidazolium acetate (BMIMAc), and 1-ethyl-3-methyl-imidazolium acetate (EMIMAc), in order to observe the effect of the solvent in the structural characteristics of this type of materials. The process of elaboration of aerogels comprised the formation of physical gels through anti-solvent vapor diffusion, liquid phase exchange, and supercritical CO(2) drying. The aerogels maintained the chemical identity of chitosan according to Fourier transform infrared spectrophotometer (FT-IR) spectroscopy, indicating the presence of their characteristic functional groups. The internal structure of the obtained aerogels appears as porous aggregated networks in microscopy images. The obtained materials have specific surface areas over 350 m(2)/g and can be considered mesoporous. According to swelling experiments, the chitosan aerogels could absorb between three and six times their weight of water. However, the swelling and diffusion coefficient decreased at higher temperatures. The structural characteristics of chitosan aerogels that are obtained from ionic liquids are distinctive and could be related to solvation dynamic at the initial state.
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spelling pubmed-64186012019-04-02 Aerogels from Chitosan Solutions in Ionic Liquids Santos-López, Gonzalo Argüelles-Monal, Waldo Carvajal-Millan, Elizabeth López-Franco, Yolanda L. Recillas-Mota, Maricarmen T. Lizardi-Mendoza, Jaime Polymers (Basel) Article Chitosan aerogels conjugates the characteristics of nanostructured porous materials, i.e., extended specific surface area and nano scale porosity, with the remarkable functional properties of chitosan. Aerogels were obtained from solutions of chitosan in ionic liquids (ILs), 1-butyl-3-methylimidazolium acetate (BMIMAc), and 1-ethyl-3-methyl-imidazolium acetate (EMIMAc), in order to observe the effect of the solvent in the structural characteristics of this type of materials. The process of elaboration of aerogels comprised the formation of physical gels through anti-solvent vapor diffusion, liquid phase exchange, and supercritical CO(2) drying. The aerogels maintained the chemical identity of chitosan according to Fourier transform infrared spectrophotometer (FT-IR) spectroscopy, indicating the presence of their characteristic functional groups. The internal structure of the obtained aerogels appears as porous aggregated networks in microscopy images. The obtained materials have specific surface areas over 350 m(2)/g and can be considered mesoporous. According to swelling experiments, the chitosan aerogels could absorb between three and six times their weight of water. However, the swelling and diffusion coefficient decreased at higher temperatures. The structural characteristics of chitosan aerogels that are obtained from ionic liquids are distinctive and could be related to solvation dynamic at the initial state. MDPI 2017-12-16 /pmc/articles/PMC6418601/ /pubmed/30966024 http://dx.doi.org/10.3390/polym9120722 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Santos-López, Gonzalo
Argüelles-Monal, Waldo
Carvajal-Millan, Elizabeth
López-Franco, Yolanda L.
Recillas-Mota, Maricarmen T.
Lizardi-Mendoza, Jaime
Aerogels from Chitosan Solutions in Ionic Liquids
title Aerogels from Chitosan Solutions in Ionic Liquids
title_full Aerogels from Chitosan Solutions in Ionic Liquids
title_fullStr Aerogels from Chitosan Solutions in Ionic Liquids
title_full_unstemmed Aerogels from Chitosan Solutions in Ionic Liquids
title_short Aerogels from Chitosan Solutions in Ionic Liquids
title_sort aerogels from chitosan solutions in ionic liquids
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418601/
https://www.ncbi.nlm.nih.gov/pubmed/30966024
http://dx.doi.org/10.3390/polym9120722
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