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Relationship between freeze-drying and supercritical drying of cellulosic fibers with different moisture contents based on pore and crystallinity measurements

Relationship between freeze-drying and supercritical drying of cellulosic fibers with different... This work investigated the relationship between freeze-drying and supercritical drying of cellulosic fibers with different moisture contents based on pore and crystallinity measurements. The results showed that freeze-drying reduced the specific surface area and pore volume of cellulosic fibers by 20–160-fold, compared to supercritical drying. At the same time, freeze-dried fibers had a higher crystallinity index and crystal size than supercritically dried fibers. Freeze-drying also significantly changed the nitrogen adsorption–desorption isotherm and pore size distribution of cellulosic fibers. However, most importantly, freeze-dried fibers had linear positive correlations with supercritically dried fibers in terms of pore parameters and crystallinity, indicating that freeze-dried samples retained the trends and qualitative relationships of supercritically dried fibers. Therefore, freeze-drying can be used as the pretreatment procedure for pore and crystallinity measurements of cellulosic fibers from poplar and eucalyptus when comparing the effects of thermal drying. This work also deepens the understanding of the drying of cellulosic fibers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wood Science and Technology Springer Journals

Relationship between freeze-drying and supercritical drying of cellulosic fibers with different moisture contents based on pore and crystallinity measurements

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References (55)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022
ISSN
0043-7719
eISSN
1432-5225
DOI
10.1007/s00226-022-01387-w
Publisher site
See Article on Publisher Site

Abstract

This work investigated the relationship between freeze-drying and supercritical drying of cellulosic fibers with different moisture contents based on pore and crystallinity measurements. The results showed that freeze-drying reduced the specific surface area and pore volume of cellulosic fibers by 20–160-fold, compared to supercritical drying. At the same time, freeze-dried fibers had a higher crystallinity index and crystal size than supercritically dried fibers. Freeze-drying also significantly changed the nitrogen adsorption–desorption isotherm and pore size distribution of cellulosic fibers. However, most importantly, freeze-dried fibers had linear positive correlations with supercritically dried fibers in terms of pore parameters and crystallinity, indicating that freeze-dried samples retained the trends and qualitative relationships of supercritically dried fibers. Therefore, freeze-drying can be used as the pretreatment procedure for pore and crystallinity measurements of cellulosic fibers from poplar and eucalyptus when comparing the effects of thermal drying. This work also deepens the understanding of the drying of cellulosic fibers.

Journal

Wood Science and TechnologySpringer Journals

Published: May 1, 2022

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