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
Formation of shear thinning gels from partially oxidised cellulose nanofibrils
TL;DR: Partially oxidised, dispersed cellulose nanofibres form shear thinning gels in the presence of moderate amounts of simple salts or surfactants providing a novel method to structure aqueous formulations, which may be of use in a substantial number of applications where it is desirable to enhance the viscosity of formulated materials using components from a renewable, sustainable source.
Journal ArticleDOI
Enhanced Thermal Conductivity of Bioinspired Nanofibrillated Cellulose Hybrid Films Based on Graphene Sheets and Nanodiamonds
TL;DR: In this article, high thermally conductive nanofibrillated cellulose (NOC) was used for the development of the next generation electronics, and high thermal conductivities played a key role in its development.
Journal ArticleDOI
Anti-oxidative and UV-absorbing biohybrid film of cellulose nanofibrils and tannin extract
TL;DR: In this paper, a strategy to construct biohybrid films combining the characteristics of cationic cellulose nanofibrils (CCNFs) and tannin extract for film applications was proposed.
Journal ArticleDOI
Lytic polysaccharide monooxygenase (LPMO) mediated production of ultra-fine cellulose nanofibres from delignified softwood fibres
Salla Koskela,Shennan Wang,Dingfeng Xu,Xuan Yang,Kai Li,Lars Berglund,Lauren S. McKee,Vincent Bulone,Qi Zhou +8 more
TL;DR: An environmentally friendly, energy-efficient method for cellulose nanofibre production from softwood holocellulose utilising oxidative enzymes, lytic polysaccharide monooxygenases (LPMOs).
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Fabricating electrospun cellulose nanofibre adsorbents for ion-exchange chromatography
TL;DR: Optimised chemistry protocols of DEAE and COO functionalisations improved mechanical strength and lowered binding capacities, and increased compression and bed layers lowered bindingcapacity.
References
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Journal ArticleDOI
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TL;DR: Dr. Youssef Habibi’s research interests include the sustainable production of materials from biomass, development of high performance nanocomposites from lignocellulosic materials, biomass conversion technologies, and the application of novel analytical tools in biomass research.
Journal ArticleDOI
Polymer nanotechnology: Nanocomposites
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TL;DR: In this paper, the technology involved with exfoliated clay-based nanocomposites and also include other important areas including barrier properties, flammability resistance, biomedical applications, electrical/electronic/optoelectronic applications and fuel cell interests.
Journal ArticleDOI
An Overview of Polylactides as Packaging Materials
TL;DR: The aim of this paper is to review the production techniques for PLAs, summarize the main properties of PLA and to delineate the main advantages and disadvantages of PLA as a polymeric packaging material.
Journal ArticleDOI
Review: current international research into cellulose nanofibres and nanocomposites
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TL;DR: An overview of recent progress in the area of cellulose nanofibre-based nanocomposites is given in this article, with particular emphasis on applications, such as reinforced adhesives, to make optically transparent paper for electronic displays, to create DNA-hybrid materials, to generate hierarchical composites and for use in foams, aerogels and starch nanocom composites.
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.