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Starch-Based Aerogels Obtained via Solvent-Induced Gelation

In this work, the ability of several solvents to induce gel formation from amylomaize starch solubilized in dimethyl sulfoxide (DMSO) was investigated. The formed gels were subjected to solvent exchange using ethanol and dried with supercritical carbon dioxide (sc-CO(2)) to obtain the aerogels. The...

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Autores principales: Dogenski, Mirelle, Gurikov, Pavel, Baudron, Victor, de Oliveira, J. Vladimir, Smirnova, Irina, Ferreira, Sandra R. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559039/
https://www.ncbi.nlm.nih.gov/pubmed/32961804
http://dx.doi.org/10.3390/gels6030032
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author Dogenski, Mirelle
Gurikov, Pavel
Baudron, Victor
de Oliveira, J. Vladimir
Smirnova, Irina
Ferreira, Sandra R. S.
author_facet Dogenski, Mirelle
Gurikov, Pavel
Baudron, Victor
de Oliveira, J. Vladimir
Smirnova, Irina
Ferreira, Sandra R. S.
author_sort Dogenski, Mirelle
collection PubMed
description In this work, the ability of several solvents to induce gel formation from amylomaize starch solubilized in dimethyl sulfoxide (DMSO) was investigated. The formed gels were subjected to solvent exchange using ethanol and dried with supercritical carbon dioxide (sc-CO(2)) to obtain the aerogels. The influence of starch concentration (3–15 wt%) and solvent content (20–80 wt%) on gel formation was also studied. It was demonstrated that the gelation of starch in binary mixtures of solvents can be rationalized by Hansen Solubility Parameters (HSP) revealing a crucial hole of hydrogen bonding for the gel’s strength, which is in agreement with rheological measurements. Only the addition of water or propylene glycol to starch/DMSO solutions resulted in strong gels at a minimum starch and solvent content of 7.5 wt% and 50 wt%, respectively. The resulting aerogels showed comparably high specific surface areas (78–144 m(2) g(−1)) and low envelope densities (0.097–0.203 g cm(−3)). The results of this work indicate that the HSP parameters could be used as a tool to guide the rational selection of water-free gelation in starch/DMSO systems. In addition, it opens up an attractive opportunity to perform starch gelation in those solvents that are miscible with sc-CO(2), avoiding the time-consuming step of solvent exchange.
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spelling pubmed-75590392020-10-29 Starch-Based Aerogels Obtained via Solvent-Induced Gelation Dogenski, Mirelle Gurikov, Pavel Baudron, Victor de Oliveira, J. Vladimir Smirnova, Irina Ferreira, Sandra R. S. Gels Article In this work, the ability of several solvents to induce gel formation from amylomaize starch solubilized in dimethyl sulfoxide (DMSO) was investigated. The formed gels were subjected to solvent exchange using ethanol and dried with supercritical carbon dioxide (sc-CO(2)) to obtain the aerogels. The influence of starch concentration (3–15 wt%) and solvent content (20–80 wt%) on gel formation was also studied. It was demonstrated that the gelation of starch in binary mixtures of solvents can be rationalized by Hansen Solubility Parameters (HSP) revealing a crucial hole of hydrogen bonding for the gel’s strength, which is in agreement with rheological measurements. Only the addition of water or propylene glycol to starch/DMSO solutions resulted in strong gels at a minimum starch and solvent content of 7.5 wt% and 50 wt%, respectively. The resulting aerogels showed comparably high specific surface areas (78–144 m(2) g(−1)) and low envelope densities (0.097–0.203 g cm(−3)). The results of this work indicate that the HSP parameters could be used as a tool to guide the rational selection of water-free gelation in starch/DMSO systems. In addition, it opens up an attractive opportunity to perform starch gelation in those solvents that are miscible with sc-CO(2), avoiding the time-consuming step of solvent exchange. MDPI 2020-09-19 /pmc/articles/PMC7559039/ /pubmed/32961804 http://dx.doi.org/10.3390/gels6030032 Text en © 2020 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
Dogenski, Mirelle
Gurikov, Pavel
Baudron, Victor
de Oliveira, J. Vladimir
Smirnova, Irina
Ferreira, Sandra R. S.
Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title_full Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title_fullStr Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title_full_unstemmed Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title_short Starch-Based Aerogels Obtained via Solvent-Induced Gelation
title_sort starch-based aerogels obtained via solvent-induced gelation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559039/
https://www.ncbi.nlm.nih.gov/pubmed/32961804
http://dx.doi.org/10.3390/gels6030032
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