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
Water vapor sorption properties of TEMPO oxidized and sulfuric acid treated cellulose nanocrystal films
TL;DR: Using parallel exponential kinetics (PEK) model, sorption kinetics data were accurately fitted and two Kelvin-Voigt elements were introduced to interpret the fitting results and calculate the modulus of TOCNF and SACNF.
Journal ArticleDOI
Bioplastic production from renewable lignocellulosic feedstocks: a review
R. Reshmy,Deepa Thomas,Eapen Philip,Sherely Annie Paul,Aravind Madhavan,Raveendran Sindhu,Ranjna Sirohi,Sunita Varjani,Arivalagan Pugazhendhi,Ashok Pandey,Parameswaran Binod +10 more
TL;DR: In this article, a review of lignocellulosic compositions, conversion routes for bioplastic production and their applications in various fields is presented. But, the focus of this paper is on the use of cellulose derived bioplastics.
Journal ArticleDOI
Homogenous and transparent nanocellulosic films from carrot
TL;DR: In this article, the structural, functional, crystalline and thermal properties of resulted nano fibrillated cellulose and nanocrystalline cellulose (NCC) have been extracted from carrot pulp by using non-conventional ball milling and acid hydrolysis process respectively.
Journal ArticleDOI
The effect of surface modification on chemical and crystalline structure of the cellulose III nanocrystals.
TL;DR: This systematic investigation is of great significance for understanding the effect of surface modification on the chemical and crystalline structure of CNC-III, which will provide a reference for future modifications and applications.
Journal ArticleDOI
Nanocellulose-enhanced organohydrogel with high-strength, conductivity, and anti-freezing properties for wearable strain sensors
TL;DR: In this paper , high strength, transparent, conductive, and anti-freezing organohydrogels were fabricated through the radical polymerization of polyacrylamide (PAM)/sodium alginate (SA)/TEMPO-oxidized cellulose nanofibrils (TOCNs) in a dimethyl sulfoxide (DMSO)/water solution, followed by soaking in a CaCl2 solution.
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
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Journal ArticleDOI
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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.