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Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas

Xerogels are defined as porous structures that are obtained by evaporative drying of wet gels. One challenge is producing xerogels with high porosity and large specific surface areas, which are structurally comparable to supercritical-dried aerogels. Herein, we report on cellulose xerogels with a tr...

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Autores principales: Yamasaki, Shunsuke, Sakuma, Wataru, Yasui, Hiroaki, Daicho, Kazuho, Saito, Tsuguyuki, Fujisawa, Shuji, Isogai, Akira, Kanamori, Kazuyoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6514048/
https://www.ncbi.nlm.nih.gov/pubmed/31134187
http://dx.doi.org/10.3389/fchem.2019.00316
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author Yamasaki, Shunsuke
Sakuma, Wataru
Yasui, Hiroaki
Daicho, Kazuho
Saito, Tsuguyuki
Fujisawa, Shuji
Isogai, Akira
Kanamori, Kazuyoshi
author_facet Yamasaki, Shunsuke
Sakuma, Wataru
Yasui, Hiroaki
Daicho, Kazuho
Saito, Tsuguyuki
Fujisawa, Shuji
Isogai, Akira
Kanamori, Kazuyoshi
author_sort Yamasaki, Shunsuke
collection PubMed
description Xerogels are defined as porous structures that are obtained by evaporative drying of wet gels. One challenge is producing xerogels with high porosity and large specific surface areas, which are structurally comparable to supercritical-dried aerogels. Herein, we report on cellulose xerogels with a truly aerogel-like porous structure. These xerogels have a monolithic form with porosities and specific surface areas in the ranges of 71–76% and 340–411 m(2)/g, respectively. Our strategy is based on combining three concepts: (1) the use of a very fine type of cellulose nanofibers (CNFs) with a width of ~3 nm as the skeletal component of the xerogel; (2) increasing the stiffness of wet CNF gels by reinforcing the inter-CNF interactions to sustain their dry shrinkage; and (3) solvent-exchange of wet gels with low-polarity solvents, such as hexane and pentane, to reduce the capillary force on drying. The synergistic effects of combining these approaches lead to improvements in the porous structure in the CNF xerogels.
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spelling pubmed-65140482019-05-27 Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas Yamasaki, Shunsuke Sakuma, Wataru Yasui, Hiroaki Daicho, Kazuho Saito, Tsuguyuki Fujisawa, Shuji Isogai, Akira Kanamori, Kazuyoshi Front Chem Chemistry Xerogels are defined as porous structures that are obtained by evaporative drying of wet gels. One challenge is producing xerogels with high porosity and large specific surface areas, which are structurally comparable to supercritical-dried aerogels. Herein, we report on cellulose xerogels with a truly aerogel-like porous structure. These xerogels have a monolithic form with porosities and specific surface areas in the ranges of 71–76% and 340–411 m(2)/g, respectively. Our strategy is based on combining three concepts: (1) the use of a very fine type of cellulose nanofibers (CNFs) with a width of ~3 nm as the skeletal component of the xerogel; (2) increasing the stiffness of wet CNF gels by reinforcing the inter-CNF interactions to sustain their dry shrinkage; and (3) solvent-exchange of wet gels with low-polarity solvents, such as hexane and pentane, to reduce the capillary force on drying. The synergistic effects of combining these approaches lead to improvements in the porous structure in the CNF xerogels. Frontiers Media S.A. 2019-05-07 /pmc/articles/PMC6514048/ /pubmed/31134187 http://dx.doi.org/10.3389/fchem.2019.00316 Text en Copyright © 2019 Yamasaki, Sakuma, Yasui, Daicho, Saito, Fujisawa, Isogai and Kanamori. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Yamasaki, Shunsuke
Sakuma, Wataru
Yasui, Hiroaki
Daicho, Kazuho
Saito, Tsuguyuki
Fujisawa, Shuji
Isogai, Akira
Kanamori, Kazuyoshi
Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title_full Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title_fullStr Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title_full_unstemmed Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title_short Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
title_sort nanocellulose xerogels with high porosities and large specific surface areas
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6514048/
https://www.ncbi.nlm.nih.gov/pubmed/31134187
http://dx.doi.org/10.3389/fchem.2019.00316
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