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
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Phase behaviour and droplet size of oil-in-water Pickering emulsions stabilised with plant-derived nanocellulosic materials
TL;DR: In this paper, the preparation, stability and phase behaviour of oil-in-water emulsions formed by dodecane and water and stabilised by naturally amphiphilic, chemically unmodified cellulose nanofibrils (CNF), TEMPO-oxidized cellulose Nanofibril (T-CNF) and cellulose nanocellulose nanocrystals (CNC) were investigated.
Journal ArticleDOI
Cellulose nanofibers/reduced graphene oxide flexible transparent conductive paper
TL;DR: This paper endeavors to prepare CNFs-based flexible transparent conductive paper by layer-by-layer (LbL) assembly using divalent copper ions (Cu(2+)) as the crosslinking agent and finds that the thickness of the reduced graphene oxide (RGO) active layer in the C NFs paper can be controlled by the cycle times of the LbL assembly.
Journal ArticleDOI
Cellulose nanomaterials: new generation materials for solving global issues
Teboho Clement Mokhena,Teboho Clement Mokhena,Maya Jacob John,Maya Jacob John,Maya Jacob John +4 more
TL;DR: In this article, a review describes the recent advances in the production and application of cellulose nanomaterials (CNMs) and their applications in various fields such as medical, sensors, in wastewater treatment, paper and board/packaging industry.
Journal ArticleDOI
A nanofluidic ion regulation membrane with aligned cellulose nanofibers
Tian Li,Sylvia Xin Li,Weiqing Kong,Chaoji Chen,Emily Hitz,Chao Jia,Jiaqi Dai,Xin Zhang,Robert M. Briber,Zuzanna S. Siwy,Mark A. Reed,Liangbing Hu +11 more
TL;DR: A nanofluidic membrane for ion regulation with aligned cellulose nanofibers was directly obtained from wood, demonstrating stable performance even when the membrane is folded 150° and combining the inherent advantages of cellulose offers an environmentally responsible strategy for flexible and printable nanofLUidic applications.
Journal ArticleDOI
Water vapor transport properties of regenerated cellulose and nanofibrillated cellulose films
TL;DR: In this article, water vapor transport properties of nano-fibrillated cellulose (NFC), derived from different sources, were investigated and compared with the transport characteristics of unmodified paper Gravimetric-IGA experimental system was used to measure the kinetics and water vapor permeabilities (WVPs) of the samples Water vapor adsorption-desorption isotherms were measured for different cellulose films using Belsorp instrument, and the results showed that the external surface resistance was a more dominant mechanism to mass transfer in the NFC and regenerated cellul
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.