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Quantification of cellulose nanowhiskers sulfate esterification levels.
MedLine Citation:
PMID:  23399223     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, combustion gas analysis and N(2) adsorption were used to quantify the degree of desulfation of cellulose nanowhiskers (CNWs). CNWs were produced by hydrolyzing cotton cellulose with sulfuric acid or hydrochloric acid. Hydrochloric acid treatment did not result in any cellulose chemical modification. Hydrolysis using H(2)SO(4) introduced sulfate groups onto the cellulose surface. Our results indicate that commercial cotton cellulose as received contained sulfur. The sulfur content of H(2)SO(4)-prepared CNWs was higher than that exhibited by the original cellulose due to the esterification process. Two desulfation methods, acid-catalyzed and solvolytic desulfation, have been explored to remove the sulfate groups. Neither desulfation method examined removed the sulfate groups from H(2)SO(4)-prepared CNWs completely. An estimation of surface sulfate esterification levels was made based on a model of the cellulose structure and available surface area of CNWs. According to these models, more than one third of hydroxyl groups on the surface were substituted by sulfate.
Authors:
Jin Gu; Jeffrey M Catchmark; Edward Q Kaiser; Douglas D Archibald
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Publication Detail:
Type:  Journal Article     Date:  2012-11-15
Journal Detail:
Title:  Carbohydrate polymers     Volume:  92     ISSN:  1879-1344     ISO Abbreviation:  Carbohydr Polym     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8307156     Medline TA:  Carbohydr Polym     Country:  England    
Other Details:
Languages:  eng     Pagination:  1809-16     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Intercollege Graduate Degree Program in Plant Biology, The Pennsylvania State University, University Park 16802, USA.
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