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<sub>2</sub>) to obta...
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doaj-1e256656c52e439f87ff555da87469fa2020-11-25T03:22:01ZengMDPI AGGels2310-28612020-09-016323210.3390/gels6030032Starch-Based Aerogels Obtained via Solvent-Induced GelationMirelle Dogenski0Pavel Gurikov1Victor Baudron2J. Vladimir de Oliveira3Irina Smirnova4Sandra R. S. Ferreira5Department of Chemical and Food Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, BrazilLaboratory for Development and Modelling of Novel Nanoporous Materials, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, GermanyInstitute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, GermanyDepartment of Chemical and Food Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, BrazilInstitute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, GermanyDepartment of Chemical and Food Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, BrazilIn 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<sub>2</sub>) 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<sup>2</sup> g<sup>−1</sup>) and low envelope densities (0.097–0.203 g cm<sup>−3</sup>). 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<sub>2</sub>, avoiding the time-consuming step of solvent exchange.https://www.mdpi.com/2310-2861/6/3/32starch-based aerogelsdimethyl sulfoxidesolvent-induced gelationsolubility parameters |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mirelle Dogenski Pavel Gurikov Victor Baudron J. Vladimir de Oliveira Irina Smirnova Sandra R. S. Ferreira |
spellingShingle |
Mirelle Dogenski Pavel Gurikov Victor Baudron J. Vladimir de Oliveira Irina Smirnova Sandra R. S. Ferreira Starch-Based Aerogels Obtained via Solvent-Induced Gelation Gels starch-based aerogels dimethyl sulfoxide solvent-induced gelation solubility parameters |
author_facet |
Mirelle Dogenski Pavel Gurikov Victor Baudron J. Vladimir de Oliveira Irina Smirnova Sandra R. S. Ferreira |
author_sort |
Mirelle Dogenski |
title |
Starch-Based Aerogels Obtained via Solvent-Induced Gelation |
title_short |
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_sort |
starch-based aerogels obtained via solvent-induced gelation |
publisher |
MDPI AG |
series |
Gels |
issn |
2310-2861 |
publishDate |
2020-09-01 |
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<sub>2</sub>) 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<sup>2</sup> g<sup>−1</sup>) and low envelope densities (0.097–0.203 g cm<sup>−3</sup>). 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<sub>2</sub>, avoiding the time-consuming step of solvent exchange. |
topic |
starch-based aerogels dimethyl sulfoxide solvent-induced gelation solubility parameters |
url |
https://www.mdpi.com/2310-2861/6/3/32 |
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