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.
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Acknowledgements
This work was supported by Natural Science Foundation of Guangdong Province [Grant Number 2021A1515011012]; National Natural Science Foundation of China [Grant Number 31470607]; Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences [Grant Number GZKF202033], China.
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WM: Conceptualization; Methodology, Formal analysis and investigation, Writing—original draft preparation. FK: Methodology, Writing—review and editing, Funding acquisition. KC: Funding acquisition, Resources, Supervision. BL: Writing—review and editing, Funding acquisition, Resources, Supervision.
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Mo, W., Kong, F., Chen, K. et al. Relationship between freeze-drying and supercritical drying of cellulosic fibers with different moisture contents based on pore and crystallinity measurements. Wood Sci Technol 56, 867–882 (2022). https://doi.org/10.1007/s00226-022-01387-w
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DOI: https://doi.org/10.1007/s00226-022-01387-w