Diverse nanocelluloses prepared from TEMPO-oxidized wood cellulose fibers: Nanonetworks, nanofibers, and nanocrystals

Isogai, Akira; Zhou, Yaxin

doi:10.1016/j.cossms.2019.01.001

Cited by 173 publications

(99 citation statements)

References 43 publications

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“…The hydrogen bond content and internal strength of the element make it easier to separate the fibers [ 19 , 20 , 21 ]. (iii) Chemical modification of cellulose surface hydroxyl groups, such as—using TEMPO oxidant to oxidize surface hydroxyl groups into aldehyde groups or carboxyl groups; cationization of cellulose fibers through the introduction of positive and negative charges to make cellulose through electrophilic addition or affinity; nucleus addition to introduce specific groups or components to promote the swelling of cellulose in water; or the introduction of the same charge to make fibers repel each other to reduce the cohesion between fibers [ 22 , 23 , 24 , 25 , 26 ]. Although the pretreatment of cellulose improves the ability of cellulose fibrillation, it also introduces functionalized structures or functional groups on the surface of cellulose and the levels of various factors in the experiment interact and are difficult to control, causing poor quality uniformity in the CNFs and challenging product evaluation [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

Zhao

et al. 2020

Materials

120

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This review summarizes the preparation methods of cellulose nanofibrils (CNFs) and the progress in the research pertaining to their surface modification. Moreover, the preparation and surface modification of nanocellulose were comprehensively introduced based on the existing literature. The review focuses on the mechanical treatment of cellulose, the surface modification of fibrillated fibers during pretreatment, the surface modification of nanocellulose and the modification of CNFs and their functional application. In the past five years, research on cellulose nanofibrils has progressed with developments in nanomaterials research technology. The number of papers on nanocellulose alone has increased by six times. However, owing to its high energy consumption, high cost and challenging industrial production, the applications of nanocellulose remain limited. In addition, although nanofibrils exhibit strong biocompatibility and barrier and mechanical properties, their high hydrophilicity limits their practical application. Current research on cellulose nanofibrils has mainly focused on the industrial production of CNFs, their pretreatment and functional modification and their compatibility with other biomass materials. In the future, with the rapid development of modern science and technology, the demand for biodegradable biomass materials will continue to increase. Furthermore, research on bio-based nanomaterials is expected to advance in the direction of functionalization and popularization.

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Section: Introductionmentioning

confidence: 99%

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

Zhao

et al. 2020

Materials

120

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“…When wood cellulose fibers with or without mild pretreatment are mechanically disintegrated in water, nanocelluloses consisting of cellulose nanonetwork (CNNeW) structures differing from TOCNs or T-CNCs are produced (Henriksson et al, 2007;Pääkkö et al, 2007;Wågberg et al, 2008;Klemm et al, 2011;Moon et al, 2011;Isogai and Zhou, 2019). The CNNeWs have heterogeneous fibril widths of 5-100 nm and branched or network structures of cellulose fibrils depending on the original wood cellulose fibers and mechanical disintegration conditions.…”

Section: Introductionmentioning

confidence: 99%

Nanocellulose Film Properties Tunable by Controlling Degree of Fibrillation of TEMPO-Oxidized Cellulose

et al. 2020

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A fibrous 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized wood cellulose/water slurry was disintegrated with a magnetic stirrer or high-pressure homogenizer under various conditions to prepare TEMPO-oxidized cellulose (TOC)/water dispersions with different degrees of fibrillation. The turbidity value of the as-prepared dispersion was used as a measure of the degree of nanofibrillation of the fibrous TOC slurry in water. The fibrillated TOC/water dispersions with low degrees of fibrillation had cellulose nanonetwork (CNNeW) structures consisting of TOC nanofibrils (TOCNs), unfibrillated TOC fibers, and fibril bundles. The original TOC/water slurry and partly fibrillated TOC/water dispersions with low degrees of fibrillation were converted to a sheet and films, respectively, in a short time by membrane filtration, and they had low bulk densities and high porosities. Membrane filtration of an almost completely nanofibrillated TOC/water or TOCN dispersion took a long time, but the as-prepared TOCN films had the highest light transparency, tensile strength, Young's modulus, and work of fracture. The oxygen permeabilities of the films at 23 • C and 50% relative humidity were as low as 1-2 ml µm m −2 day −1 kPa −1 among the films prepared from the fibrillated TOC/water dispersions with a wide turbidity range of 0.01-0.45. Therefore, TEMPO-oxidized CNNeW films with the versatile optical, porous, and mechanical properties but similarly low oxygen permeabilities can be prepared by controlling the degree of fibrillation of the TOC/water slurry (Graphical Abstract).

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“…Much attention has been heretofore focused on cellulose-based materials such as paper, cloth and cotton fabrics due to their playing an important role in a wide variety of fields such as the textile industry, printing and coating areas. 1–4 However, cellulose reveals the great sensitivity to water and moisture, quite different from the traditional synthetic organic polymers. 1–4 Therefore, the transformation of such hydrophilic materials into hydrophobic, especially superhydrophobic derivatives has been hitherto strongly desirable in order to open a new route to the development of novel cellulose-based materials.…”

Section: Introductionmentioning

confidence: 99%

“…1–4 However, cellulose reveals the great sensitivity to water and moisture, quite different from the traditional synthetic organic polymers. 1–4 Therefore, the transformation of such hydrophilic materials into hydrophobic, especially superhydrophobic derivatives has been hitherto strongly desirable in order to open a new route to the development of novel cellulose-based materials. 5–8 In various cellulose-based materials, it is well known that cellulose nanofibers (CNFs) can be obtained from plant cell walls, and CNFs are one of the most ubiquitous and abundant polymers on the planet.…”

Section: Introductionmentioning

confidence: 99%

“…5–8 In various cellulose-based materials, it is well known that cellulose nanofibers (CNFs) can be obtained from plant cell walls, and CNFs are one of the most ubiquitous and abundant polymers on the planet. 1–4,9 Especially, there has been considerable interest in CNFs owing to their great applications, such as high-strength lightweight materials, device substrates, textile, food packaging films, cosmetic, and medical materials. 10–21 From this point of view, it is of particular important to develop the CNF derivatives possessing a superhydrophobic characteristic.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and applications of wettability-controlled fluoroalkyl end-capped oligomer/cellulose nanofiber composites

Sawada

Endo

Oikawa

2020

Journal of Composite Materials

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Sol-gel reaction of two fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSi(OMe)3) n-RF; RF = CF(CF3)OC3F7; n = 2, 3: RF-(VM) n-RF] in the presence of cellulose nanofiber (CNF) under non-catalytic conditions was found to provide the corresponding fluorinated oligomeric silica/CNF composites [RF-(VM-SiO3/2) n-RF/CNF]. The obtained composites were applied to the surface modification of glass to give a good oleophobic/superhydrophobic characteristic on the composite surface due to the fabrication of the roughness architecture. The RF-(VM-SiO3/2) n-RF/CNF composites were also applied to the surface modification of poly(ethylene terephthalate) [PET] fabric swatch, affording a superoleophilic/superhydrophobic characteristic on the modified fabric surface. Modified PET fabric swatch thus obtained was applicable to not only the separation membrane to separate the mixture of oil/water but also the perfect adsorption of oil droplets spread on water interface. In addition, we have prepared the RF-(VM-SiO3/2) n-RF/CNF composites films by casting homogeneous aqueous methanol solutions containing the corresponding composites. Pristine CNF film afforded the superoleophilic property on the surface; however, it was demonstrated that the obtained transparent colorless CNF composite films can supply highly oleophobic characteristic on the surface.

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Diverse nanocelluloses prepared from TEMPO-oxidized wood cellulose fibers: Nanonetworks, nanofibers, and nanocrystals

Cited by 173 publications

References 43 publications

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

Nanocellulose Film Properties Tunable by Controlling Degree of Fibrillation of TEMPO-Oxidized Cellulose

Preparation and applications of wettability-controlled fluoroalkyl end-capped oligomer/cellulose nanofiber composites

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