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Title: Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas
Authors: Yamasaki, Shunsuke
Sakuma, Wataru
Yasui, Hiroaki
Daicho, Kazuho
Saito, Tsuguyuki
Fujisawa, Shuji
Isogai, Akira
Kanamori, Kazuyoshi
Author's alias: 佐久間, 渉
大長, 一帆
齋藤, 継之
藤澤, 秀次
磯貝, 明
金森, 主祥
Keywords: cellulose nanofiber
xerogel
aerogel
porous material
ambient pressure drying
Issue Date: 7-May-2019
Publisher: Frontiers Media SA
Journal title: Frontiers in Chemistry
Volume: 7
Thesis number: 316
Abstract: 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 m2/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.
Rights: © 2019 Yamasaki, Sakuma, Yasui, Daicho, Saito, Fujisawa, Isogai and Kanamori. 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.
URI: http://hdl.handle.net/2433/241775
DOI(Published Version): 10.3389/fchem.2019.00316
PubMed ID: 31134187
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