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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Individualization of cellulose nanofibers from wood using high-intensity ultrasonication combined with chemical pretreatments  [2011]

Chen, Wenshuai; Yu, Haipeng; Liu, Yixing; Chen, Peng; et al.

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Cellulose nanofibers were individualized from poplar wood in two distinct stages. Initially, wood fibers were subjected to a chemical process to eliminate lignin and hemicellulose. The obtained chemical-purified cellulose fibers were then mechanically separated into nanofibers using high-intensity ultrasonication. The diameter distributions of the resulting nanofibers were dependent on the output power of the ultrasonic treatment. TEM and FE-SEM images showed that the diameter of the obtained nanofibers ranged from 5 to 20nm when the output power of the conducted ultrasonication was greater than 1000W. FTIR and XRD results indicated that hemicellulose and lignin were removed extensively in the cellulose nanofibers, with a crystallinity of approximately 69%. The TGA results showed that the degradation temperature of the nanofibers was dramatically increased to approximately 335°C compared with 210°C of the original wood fibers. The obtained nanofibers may be potentially applied in various fields, such as bio-nanocomposites, tissue engineering scaffolds, filtration media, packaging, and so on.
From the journal
Carbohydrate polymers
ISSN : 0144-8617

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
83
Issue:
4
Start Page:
1804
End Page:
1811
Publisher:
Elsevier Ltd
All titles:
"Individualization of cellulose nanofibers from wood using high-intensity ultrasonication combined with chemical pretreatments"@eng
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
83
Issue:
4
Start Page:
1804
End Page:
1811
Publisher:
Elsevier Ltd
All titles:
"Individualization of cellulose nanofibers from wood using high-intensity ultrasonication combined with chemical pretreatments"@eng