A Method for Isolating Cellulose Nanofibrils From Wood and Their Morphological Characteristics

Chen, Wenshuai; Yu, Haipeng; Liu, Yixing; Jiang, N.; Chen, Peng

doi:10.3724/sp.j.1105.2010.09438

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…5, and the spectra are normalized at the peak of CH 2 (2900 cm -1 ) in order to make comparisons between them. The strong absorptions nearly at 3420 cm -1 are assigned to hydroxyl group stretching intramolecular hydrogen bonds (Dudley and Lan 1973;Chen et al 2010). After nanofabrication, the intensity of these vibration peaks decreases due to some breakages of intramolecular hydrogen bonds.…”

Section: Ftir Spectra Analysismentioning

confidence: 99%

Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization

Pan¹,

Zhou²,

Chen³

2013

BioResources

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This study focused on cellulose nanowhiskers (CNWs) isolation using a combination of acid hydrolysis and high pressure homogenization, and investigated the effects of acid concentration (20, 40, and 60 wt%), hydrolysis temperature (20, 40, and 60 o C), and hydrolysis time (2, 4, and 6 h) on the geometry and chemical properties. After the combined treatment, nanoparticles were rodlike with a diameter of 11 to 33 nm, a length of 199 to 344 nm, and aspect ratio of 10 to 18, which are characteristic properties of CNWs. Fourier transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS) analyses showed that some breakages of intramolecular hydrogen bonds and glycosidic bonds occurred during the hydrolysis reaction of MCC. An increase in acid concentration from 20 to 60 wt% could effectively accelerate these breakages in cellulose molecules, leading to narrower, less polydisperse nanowhiskers with lower crystallinity.

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Section: Ftir Spectra Analysismentioning

confidence: 99%

Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization

Pan¹,

Zhou²,

Chen³

2013

BioResources

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“…7. The characteristic diffraction peaks at 2θ = 16.5° and 2θ = 22.6° were respectively assigned to the (101) and (002) planes of cellulose I. Transformations of crystalline structures of the samples were not observed under the hot pressing condition, and the samples exhibited diffraction peaks similar to those of natural cellulose (Chen et al 2010). Following the instructions proposed by Segal et al (1959), the relative crystallinities of samples A, B, and C were found to be 61.7%, 70.5%, and 73.1%, respectively, as shown in Fig.…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 91%

Preparation and Evaluation of Green Composites Using Modified Ammonium Lignosulfonate and Polyethylenimine as a Binder

Yuan¹,

Guo²,

Liu³

2013

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Modified ammonium lignosulfonate (MAL) and polyethylenimine (PEI) were combined and used as a binder in the manufacture of a woodbased green composite. The effects of hot pressing temperature (150 ºC to 190 ºC), hot pressing time (3 min to 11 min), binder content (10 wt.% to 30 wt.%), and MAL/PEI weight ratio (1:1 to 1:9) on the physicomechanical properties of the composites were investigated. The composites met the mechanical property requirements for furniture grade medium density fiberboard (MDF-FN REG) under the following parameters: hot pressing temperature of 170 ºC, hot pressing time of 7 min, binder content of 20 wt.%, and MAL/PEI weight ratio of 7:1. Under optimum processing, although the X-ray diffraction analysis showed that the addition of either unmodified ammonium lignosulfonate (UMAL) or MAL did not change the crystalline structure, this addition markedly improved the relative crystallinity of the composites in comparison to that of pure wood fiber. The DMA results indicated that the MAL/PEI composites had higher storage modulus and tanδ values than did the UMAL/PEI composites. Moreover, SEM analysis showed that the MAL/PEI composites had better bonding strength characteristics than did the UMAL/PEI composites.

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“…High-intensity ultrasonication is also intensively utilized for CNF isolation [154][155][156][157][158][159]. A common ultrasonicator is equipped with a cylindrical titanium alloy probe tip with a tunable diameter ( Figure 8K), and usually, the cellulose pulps are suggested to be placed in an ice bath for cooling during the ultrasonication process.…”

Section: Mechanical Nanofibrillationmentioning

confidence: 99%

Biopolymer nanofibrils: Structure, modeling, preparation, and applications

Ling

Chen

Fan

et al. 2018

Progress in Polymer Science

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357

263

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Biopolymer nanofibrils exhibit exceptional mechanical properties with a unique combination of strength and toughness, while also presenting biological functions that interact with the surrounding environment. These features of biopolymer nanofibrils profit from their hierarchical structures that spun angstrom to hundreds of nanometer scales. To maintain these unique structural features and to directly utilize these natural supramolecular assemblies, a variety of new methods have been developed to produce biopolymer nanofibrils. In particular, cellulose nanofibrils (CNFs), chitin nanofibrils (ChNFs), silk nanofibrils (SNFs) and collagen nanofibrils (CoNFs), as the four most abundant biopolymer nanofibrils on earth, have been the focus of research in recent years due to their renewable features, wide availability, low-cost, biocompatibility, and biodegradability. A series of top-down and bottom-up strategies have been accessed to exfoliate and regenerate these nanofibrils for versatile advanced applications. In this review, we first summarize the structures of biopolymer nanofibrils in nature and outline their related computational models with the aim of disclosing fundamental structure-property relationships in biological materials. Then, we discuss the underlying methods used for the preparation of CNFs, ChNFs, SNF and CoNFs, and discuss emerging applications for these biopolymer nanofibrils.

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A Method for Isolating Cellulose Nanofibrils From Wood and Their Morphological Characteristics

Cited by 7 publications

References 32 publications

Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization

Cellulose Nanowhiskers Isolation and Properties from Acid Hydrolysis Combined with High Pressure Homogenization

Preparation and Evaluation of Green Composites Using Modified Ammonium Lignosulfonate and Polyethylenimine as a Binder

Biopolymer nanofibrils: Structure, modeling, preparation, and applications

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