Journal ArticleDOI
TEMPO-oxidized cellulose nanofibers
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TLDR
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.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.read more
Citations
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Journal ArticleDOI
Cellulose long fibers fabricated from cellulose nanofibers and its strong and tough characteristics.
Abdullahil Kafy,Hyun Chan Kim,Lindong Zhai,Jung Woong Kim,Le Van Hai,Tae June Kang,Jaehwan Kim +6 more
TL;DR: The results indicate that strong and tough cellulose long fiber can be produced by using ionic crosslinking, controlling spinning speed, stretching and drying.
Journal ArticleDOI
Ultraselective Gas Separation by Nanoporous Metal−Organic Frameworks Embedded in Gas‐Barrier Nanocellulose Films
Makoto Matsumoto,Takuya Kitaoka +1 more
TL;DR: MOF-TOCN films coated on a paper filter demonstrate a high CO2 /CH4 selectivity, over 120 for CO2 at a high gas flux, by the combination of the nanoporous MOFs and the gas-barrier TOCNs, which have strong affinity with each other.
Journal ArticleDOI
Cellulose nanocrystal (CNC)–inorganic hybrid systems: synthesis, properties and applications
TL;DR: This review provides an overview and future perspective on recent advances in the development on functional CNC-inorganic hybrids with potential applications in biomedical and chemical systems.
Journal ArticleDOI
Hydrophobic, Ductile, and Transparent Nanocellulose Films with Quaternary Alkylammonium Carboxylates on Nanofibril Surfaces
TL;DR: Hydrophobic, ductile, and transparent nanocellulose films were prepared by casting and drying aqueous dispersions of 2,2,6,6-tetramethylpiperidine-1-oxyl-oxidized cellulose nanofibrils with quaternary alkylammoniums (QAs) as counterions for the surface carboxylate groups.
Journal ArticleDOI
Ultrastrong and conductive MXene/cellulose nanofiber films enhanced by hierarchical nano-architecture and interfacial interaction for flexible electromagnetic interference shielding
TL;DR: In this paper, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) oxidized cellulose nanofibers (TOCNFs) were used to fabricate ultrathin and flexible Ti3C2Tx and TOCNF composite films with a nacre-like layered structure via a simple vacuum assisted assembly.
References
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Journal ArticleDOI
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Journal ArticleDOI
Cellulose nanofibers prepared by TEMPO-mediated oxidation of native cellulose
TL;DR: Never-Dried and once-dried hardwood celluloses were oxidized by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated system, and highly crystalline and individualized cellulose nanofibers, dispersed in water, were prepared by mechanical treatment of the oxidized celluloses/water slurries.