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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Tailored approaches in drug development and diagnostics: from molecular design to biological model systems
Cecilia Sahlgren,Annika Meinander,Hongbo Zhang,Fang Cheng,Maren Preis,Chunlin Xu,Tiina A. Salminen,Diana M. Toivola,Diana M. Toivola,Daniel Abankwa,Ari Rosling,Didem Şen Karaman,Outi M. H. Salo-Ahen,Ronald Österbacka,John E. Eriksson,Stefan Willför,Ion Petre,Jouko Peltonen,Reko Leino,Mark S. Johnson,Jessica M. Rosenholm,Niklas Sandler +21 more
TL;DR: The broad scope reflects the multidisciplinary nature of the field of DDD and aims to highlight the convergence of biological, pharmaceutical, and medical disciplines needed to meet the societal challenges of the 21st century.
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Cellulose nanofiber–graphene all solid-state flexible supercapacitors
TL;DR: In this paper, a CNF-RGO hybrid aerogel-based flexible supercapacitor was proposed for flexible super-capacitors with high capacitance (207 F g−1).
Journal ArticleDOI
Self-aligned integration of native cellulose nanofibrils towards producing diverse bulk materials
Tsuguyuki Saito,Takehiko Uematsu,Takehiko Uematsu,Satoshi Kimura,Toshiharu Enomae,Akira Isogai +5 more
TL;DR: In this paper, the integration control of self-aligned cellulose nanofibrils, i.e., careful adjustment of the pH and evaporation of the solvent in the nanofibil dispersions, produces a wide range of artificial bulk materials with outstanding properties.
Journal ArticleDOI
Nanocellulose in Sensing and Biosensing
TL;DR: In this article, the authors highlight how nanocellulose (NC) is being tailored and applied in (bio)sensing technology, whose results aim at displaying analytical information related to various fields such as clinical/medical diagnostics, environmental monitoring, food safety, physical/mechanical sensing, labeling and bioimaging appli...
Journal ArticleDOI
TEMPO-Oxidized Nanocellulose Participating as Crosslinking Aid for Alginate-Based Sponges
TL;DR: Together with the facile and ionic crosslinking process, the ultrahigh porosity, promising water absorption and retention, as well as the improved compression strength of the crosslinked sponges should significantly extend the use of this soft material in diverse practical applications.
References
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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.