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TEMPO-oxidized cellulose nanofibers

Isogai, Akira, Saito, Tsuguyuki, Fukuzumi, Hayaka·2011·Nanoscale

Abstract

Native wood celluloses can be converted to individual nanofibers 3-4 nm wide that are at least several microns in length, i.e. with aspect ratios>100, by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation and successive mild disintegration in water. Preparation methods and fundamental characteristics of TEMPO-oxidized cellulose nanofibers (TOCN) are reviewed in this paper. Significant amounts of C6 carboxylate groups are selectively formed on each cellulose microfibril surface by TEMPO-mediated oxidation without any changes to the original crystallinity (∼74%) or crystal width of wood celluloses. Electrostatic repulsion and/or osmotic effects working between anionically-charged cellulose microfibrils, the ζ-potentials of which are approximately -75 mV in water, cause the formation of completely individualized TOCN dispersed in water by gentle mechanical disintegration treatment of TEMPO-oxidized wood cellulose fibers. Self-standing TOCN films are transparent and flexible, with high tensile strengths of 200-300 MPa and elastic moduli of 6-7 GPa. Moreover, TOCN-coated poly(lactic acid) films have extremely low oxygen permeability. The new cellulose-based nanofibers formed by size reduction process of native cellulose fibers by TEMPO-mediated oxidation have potential application as environmentally friendly and new bio-based nanomaterials in high-tech fields.

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Metadata

Authors
Isogai, A., Saito, T., & Fukuzumi, H.
Venue
Nanoscale
Published
2011
Volume
3
Issue
1
Pages
71-85
ISSN
  • 2040-3364 (ISSN-L)
  • 2040-3372
OpenAlex
W2110567375
Cited by
3,179
References
10
FWCI
20.02
Type
journal article
Language
en
Open access
closed

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Isogai, A., Saito, T., & Fukuzumi, H. (2011). TEMPO-oxidized cellulose nanofibers. Nanoscale. https://doi.org/10.1039/c0nr00583e

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