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
Fabricating efficient flexible organic photovoltaics using an eco-friendly cellulose nanofibers/silver nanowires conductive substrate
Po-Chen Lin,Cheng-Tien Hsieh,Xin Liu,Feng-Cheng Chang,Wen-Chang Chen,Jiangsheng Yu,Chu-Chen Chueh +6 more
TL;DR: In this article, a highly transparent and flexible conductive substrate based on eco-friendly cellulose nanofibers (CNFs) is successfully developed by embedding silver nanowires (Ag NWs) into the TEMPO-oxidized CNFs through a facile, printable transfer method.
Journal ArticleDOI
Morphology of cross-linked cellulose nanocrystal aerogels: cryo-templating versus pressurized gas expansion processing
TL;DR: In this paper, the authors compared CNC aerogels prepared using a new processing method, called pressurized gas expansion (PGX) technology, to aerogel produced via cryo-templating.
Journal ArticleDOI
A mathematical model for pH-responsive ionically crosslinked TEMPO nanocellulose hydrogel design in drug delivery systems.
TL;DR: The presented approach will accelerate, improve and reduce the cost of research in the field of controlled release technology with target drug delivery as well as the influence of substituent groups, ionic interactions and hydrogen bonds in different pH medium were evaluated.
Journal ArticleDOI
PMMA/TEMPO-oxidized cellulose nanofiber nanocomposite with improved mechanical properties, high transparency and tunable birefringence
TL;DR: In this paper, a simple surface modification of cellulose nanofibers (CNFs) with amine-functionalized poly(ethylene glycol) was performed to achieve high transparency and controllable birefringence.
Journal ArticleDOI
Rational design of interlaced Co9S8/carbon composites from ZIF-67/cellulose nanofibers for enhanced lithium storage
TL;DR: In this article, the authors used a cellulose nanofibers (CNFs) to string ZIF-67 particles and interlaced Co9S8/porous carbon composite.
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.