Effect of nanocellulose fiber hornification on water fraction characteristics and hydroxyl accessibility during dehydration

Ding, Qijun; Zeng, Jinsong; Wang, Bin; Tang, Darong; Chen, Kefu

doi:10.1016/j.carbpol.2018.11.075

Cited by 51 publications

(26 citation statements)

References 39 publications

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“…A higher estimated surface area for dye adsorption compared to BET has also been reported for CNCs [ 35 ]. Hornfication for CNFs is, furthermore, more pronounced compared to CNCs [ 36 ], which further supports the increased differences observed in this study.…”

Section: Resultssupporting

confidence: 88%

The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall

et al. 2021

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Wood from field-grown poplars with different genotypes and varying lignin content (17.4 wt % to 30.0 wt %) were subjected to one-pot 2,2,6,6-Tetramethylpiperidin-1-yl)oxyl catalyzed oxidation and high-pressure homogenization in order to investigate nanofibrillation following simultaneous delignification and cellulose oxidation. When comparing low and high lignin wood it was found that the high lignin wood was more easily fibrillated as indicated by a higher nanofibril yield (68% and 45%) and suspension viscosity (27 and 15 mPa·s). The nanofibrils were monodisperse with diameter ranging between 1.2 and 2.0 nm as measured using atomic force microscopy. Slightly less cellulose oxidation (0.44 and 0.68 mmol·g−1) together with a reduced process yield (36% and 44%) was also found which showed that the removal of a larger amount of lignin increased the efficiency of the homogenization step despite slightly reduced oxidation of the nanofibril surfaces. The surface area of oxidized high lignin wood was also higher than low lignin wood (114 m2·g−1 and 76 m2·g−1) which implicates porosity as a factor that can influence cellulose nanofibril isolation from wood in a beneficial manner.

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Section: Resultssupporting

confidence: 88%

The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall

et al. 2021

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“…Furthermore, if heated, hornification can also occur. Hornification is the formation of irreversible (or at best, partially reversible) bonds between cellulose hydroxyl groups (Ding et al, 2019). The most common drying methods to obtain powdered nanocelluloses are described below.…”

Section: Nanocellulose Powders Droplets and Beadsmentioning

confidence: 99%

“…Parker et al, 2016), or producing semi-spherical geometries of chiral nematic CNC films by using elastomeric molds to template 4-6 mm shapes (Rofouie et al, 2018). Such dried droplets or semi-spheres will hold together if placed in water for at least a short time (minutes to hours), which can be extended if they were dried completely from an acid form CNC suspension or heat treated after drying to induce hornification (Beck et al, 2012;Ding et al, 2019). An alternative route to solid, spherical nanocellulose particles involves oxidizing cellulose nanofibrils from green algae to dialdehyde cellulose that inherently forms 1-20 µm sized beads (Lindh et al, 2014).…”

Section: Beadsmentioning

confidence: 99%

Bottom-up assembly of nanocellulose structures

Niinivaara

Cranston

2020

Carbohydrate Polymers

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“…To overcome this shortcoming, researchers had basically proposed three different strategies for pretreatment of cellulose bers before mechanical treatment: (1) limit the hydrogen bonding in the system, and (2) add repulsive charges, and (3) reduce the DP or amorphous connection between individual laments (Lavoine et al 2012). It is worth noting that the proper pretreatment of cellulose bers can promote the accessibility of hydroxyl groups, increase the inner surface, change the crystallinity and cleave the cellulose hydrogen bonds, improve the reactivity of the bers and effectively reduce the energy consumption during the brillation process, such as alkaline-acid, enzymatic hydrolysis, TEMPO-mediated oxidation and carboxymethylation (Asad et al 2018; Chinga-Carrasco 2011; Ding et al 2018;Nie et al 2018;Saeed et al 2018). Previous studies had shown that pretreatment (such as enzymes, chemicals) could help reduce the energy consumption of cellulose bers consumption to an amount of 1000 kWh/t from 20,000 to 30,000 kWh/t (Siró and Plackett 2010).…”

Section: Introductionmentioning

confidence: 99%

Insight into the Evolution of the Cellulose Microstructure Through the Enzyme Pretreatment Method

Ding

Jing

Han

et al. 2021

Preprint

Self Cite

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In this work, the changes of properties and microstructure of cellulose (bleached hardwood kraft pulp (BHKP)) subjected to different enzyme pretreatment times (0–10 h) were explored for further fibrillation. The various properties of the pretreated cellulose gradually decrease with the elapse of time relative to the pristine material, such as yield, water retention value, aspect ratio and degree of polymerization, etc. Enzyme pretreatment can promote the peeling of fibrils and loosen the amorphous areas of cellulose identified by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD). A thorough investigation of the relation between pretreatment and evolution of inter-/intra-molecular H-bonds in cellulose was conducted including content and cleave sequence of H-bonds by Fourier transform infrared spectroscopy (FTIR), second derivative analysis and generalized two-dimensional correlation spectroscopy (2DCOS). The intermolecular H-bonds with the most significant decrease in content was cleaved first relative to the intramolecular H-bonds. These discoveries provide theoretical support to more effective pretreatment method for commercial production of fibrils from cellulosic fibers.

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Effect of nanocellulose fiber hornification on water fraction characteristics and hydroxyl accessibility during dehydration

Cited by 51 publications

References 39 publications

The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall

The Effect of High Lignin Content on Oxidative Nanofibrillation of Wood Cell Wall

Bottom-up assembly of nanocellulose structures

Insight into the Evolution of the Cellulose Microstructure Through the Enzyme Pretreatment Method

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