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Morphological development of cellulose fibrils of a bleached eucalyptus pulp by mechanical fibrillation

Morphological development of cellulose fibrils of a bleached eucalyptus pulp by mechanical... This study reports the production of cellulose nanofibrils (CNF) from a bleached eucalyptus pulp using a commercial stone grinder. Scanning electronic microscopy and transmission electronic microscopy imaging were used to reveal morphological development of CNF at micro and nano scales, respectively. Two major structures were identified: (1) highly kinked, naturally helical, and untwisted fibrils that serve as backbones of CNF networks, and (2) entangled, less distinctively kinked (or curled) and twisted “soft looking” nanofibrils. These two major structures appeared in different features of CNF network such as “trees”, “net”, “flower”, single fibril, etc. Prolonged fibrillation can break the nanofibrils into nanowhiskers from the untwisted fibrils with high crystallinity. Energy input for mechanical fibrillation is on the order of 5–30 kWh/kg. The gradual reduction in network size of CNF with time may be used to fractionate CNF. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cellulose Springer Journals

Morphological development of cellulose fibrils of a bleached eucalyptus pulp by mechanical fibrillation

Wang, Q.; Zhu, J.; Gleisner, R.; Kuster, T.; Baxa, U.; McNeil, S.
Cellulose , Volume 19 (5) – Jul 25, 2012
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References (30)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media B.V. (outside the USA)
Subject
Chemistry; Polymer Sciences; Physical Chemistry; Bioorganic Chemistry; Organic Chemistry
ISSN
0969-0239
eISSN
1572-882X
DOI
10.1007/s10570-012-9745-x
Publisher site
See Article on Publisher Site

Abstract

This study reports the production of cellulose nanofibrils (CNF) from a bleached eucalyptus pulp using a commercial stone grinder. Scanning electronic microscopy and transmission electronic microscopy imaging were used to reveal morphological development of CNF at micro and nano scales, respectively. Two major structures were identified: (1) highly kinked, naturally helical, and untwisted fibrils that serve as backbones of CNF networks, and (2) entangled, less distinctively kinked (or curled) and twisted “soft looking” nanofibrils. These two major structures appeared in different features of CNF network such as “trees”, “net”, “flower”, single fibril, etc. Prolonged fibrillation can break the nanofibrils into nanowhiskers from the untwisted fibrils with high crystallinity. Energy input for mechanical fibrillation is on the order of 5–30 kWh/kg. The gradual reduction in network size of CNF with time may be used to fractionate CNF.

Journal

Cellulose – Springer Journals

Published: Jul 25, 2012

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