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
Nanocellulose characteristics from the inner and outer layer of banana pseudo-stem prepared by TEMPO-mediated oxidation
TL;DR: In this paper, the authors extracted nanocellulose from both the inner and outer layers of a banana pseudo-stem and observed widths of approximately 7-35nm and long fibrillated fibre.
Journal ArticleDOI
Nanocellulose aerogel for highly efficient adsorption of uranium (VI) from aqueous solution.
TL;DR: In this article, a cellulose nanofibers (CNFs) aerogel was prepared via simple covalent crosslinking and freeze-drying method, which showed high specific surface area and high metal-chelating capacity.
Journal ArticleDOI
Characteristics of a free-standing film from banana pseudostem nanocellulose generated from TEMPO-mediated oxidation.
RH Fitri Faradilla,George Lee,Ji-Youn Arns,Justine J. Roberts,Penny J. Martens,Martina H. Stenzel,Jayashree Arcot +6 more
TL;DR: This initial characterization of free-standing nanocellulose film showed a promising potential of TEMPO-treated nano cellulose from banana pseudo-stem as a source of bioplastic.
Journal ArticleDOI
Biomass–derived cellulose nanofibrils membrane from rice straw as sustainable separator for high performance supercapacitor
Md. Asadul Islam,Md. Asadul Islam,Hui Lin Ong,Al Rey Villagracia,Khairul Anwar Abdul Halim,Akhilesh Babu Ganganboina,Ruey-an Doong +6 more
TL;DR: In this paper, a simple and cost-effective solution casting method is applied to prepare cellulose nanofibrils (CNF) membranes, with different thicknesses, from agricultural rice straw waste, and then used as supercapacitor separators.
Journal ArticleDOI
Xylan in the Middle: Understanding Xylan Biosynthesis and Its Metabolic Dependencies Toward Improving Wood Fiber for Industrial Processing
TL;DR: The possibility of using systems biology and systems genetics approaches to gain insight into the coordination of SCW formation with other interdependent biological processes is explored to provide new avenues for woody biomass engineering that are not possible for other biopolymers.
References
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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.