Journal
BIOMACROMOLECULES
Volume 17, Issue 6, Pages 2240-2247Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.6b00480
Keywords
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- NSERC Strategic Research Network on Green Wood Fiber Products
- Centre for Self-Assembled Chemical Structures (CSACS)
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In this work, we take advantage of the rod-like structure of electrosterically stabilized nanocrystalline cellulose (ENCC, with a width of about 7 nm and a length of about 130 nm), which has dicarboxylated cellulose (DCC) chains protruding from both ends, providing electrosterical stability for ENCC particles, to chemically end-to-end assemble these particles into nanocellulose fibers. ENCC with shorter DCC chains can be obtained by a mild hydrolysis of ENCC with HO, and subsequently the hydrolyzed ENCC (HENCC, with a-width of about 6 nm and a length of about 120 nm) is suitable to be assembled into high aspect ratio nanofibers by chemically cross-linking HENCC from one end to another. Two sets of HENCC were prepared by carbodiimide-mediated formation of an alkyne and an azide derivative, respectively. Cross-linking these two sets of HENCC was performed by a click reaction. HENCCs were also end-to-end cross-linked by a bioconjugation reaction, with a diamine. From atomic force microscopy (AFM) images, about ten HENCC nanopartides were cross-linked and formed high aspect ratio nanofibers with a width of about 6 nm and a length of mote than 1 mu m.
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