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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Studying cellulose fiber structure by SEM, XRD, NMR and acid hydrolysis

Cited 118 times inthomson ciCited 143 times inthomson ci
Title
Studying cellulose fiber structure by SEM, XRD, NMR and acid hydrolysis
Other Titles
Studying cellulose fiber structure by SEM, XRD, NMR and acid hydrolysis
Author
Zhao, HaiboKwak, JahunZhang, Z. ConradBrown, Heather M.Arey, Bruce W.Holladay, Johnathan E.
Keywords
TRANSMISSION ELECTRON-MICROSCOPY; ATOMIC-FORCE MICROSCOPY; X-RAY; DIFFRACTION; CRYSTALLINITY
Issue Date
2007-03
Publisher
ELSEVIER SCI LTD
Citation
CARBOHYDRATE POLYMERS, v.68, no.2, pp.235 - 241
Abstract
Cotton linters were partially hydrolyzed in dilute acid and the morphology of remaining macrofibrils was studied with scanning electron microscopy (SEM) under various magnifications. The crystalline region in cellulose is composed of microfibril bundles instead of separated microfibrils. These microfibril bundles in the macrofibrils were exposed by removing amorphous cellulose on and near the surface of the macrofibers. XRD suggests that the microfibril bundles have diameters of 20-30 nm. Cellulose apparent crystallinity was not altered by hydrolysis, as indicated by XRD and NMR results. These facts suggest that amorphous cellulose in the bulk (not on the surface) is not accessible to hydrolysis and that microfibril bundles are hydrolyzed through a surface reaction process. The observed agglomerization of macrofibers could be the result of the high surface potential from the remaining nucrofibrils or acid catalyzed intermolecular surface dehydration between macrofibrils. (c) 2007 Elsevier Ltd. All rights reserved
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DOI
10.1016/j.carbpol.2006.12.013
ISSN
0144-8617
Appears in Collections:
ECHE_Journal Papers
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