Effects of fibre dimension and charge density on nanocellulose gels

Mendoza, Llyza; Gunawardhana, Thilina; Batchelor, Warren; Garnier, Gil

doi:10.1016/j.jcis.2018.04.077

Cited by 35 publications

(10 citation statements)

References 38 publications

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“…Under ambient conditions, the resolution of AFM is as low as 0.1 nm (Gan 2009), which supports the validity of the observed statistical difference. CNFs with absolute sizes in similar ranges have also been reported using similar methodologies regarding chemical treatments Renneckar 2009, 2011;Usov et al 2015;Geng et al 2018;Mendoza et al 2018). The relatively small scale of the CNFs were hypothesized to be from cleavage of the native fibrils into smaller structures than the 3 nm elementary fibrils.…”

Section: Nanofibril Morphology and Fibrillation Behaviormentioning

confidence: 71%

Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics

et al. 2020

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Cellulose nanofibrils (CNFs) are top-down nanomaterials obtainable from abundant lignocelluloses. Despite recent advances in processing technologies, the effects of variations in the lignocellulose structure and composition on CNF isolation and properties are poorly understood. In this study, we compared the isolation of CNFs from tension wood (TW) and normal wood (NW) from Populus tremula (aspen). The TW has a higher cellulose content, native cellulose fibrils with a larger crystalline diameter, and less lignin than the NW, making it an interesting material for CNF isolation. The wood powders were oxidized directly by 2,2,6,6-tetramethylpiperidin-1-oxyl, and the morphology and mechanical behaviors of the nanofibril suspensions and networks were characterized. The TW was more difficult to fibrillate by both chemical and mechanical means. Larger nanofibrils (5–10 nm) composed of 1.2 nm structures were present in the TW CNFs, whereas the NW samples contained more of thin (1.6 nm) structures, which also comprised 77% of the solid yield compared to the 33% for TW. This difference was reflected in the TW CNF networks as decreased transmittance (15% vs. 50%), higher degree of crystallinity (85.9% vs. 78.0%), doubled toughness (11 MJ/m3) and higher elongation at break (12%) compared to NW. The difference was ascribed to greater preservation of the hierarchical, more crystalline microfibril structure, combined with a more cellulose-rich network (84% vs. 70%). This knowledge of the processing, structure, and properties of CNFs can facilitate the breeding and design of wood feedstocks to meet the increasing demand for nanoscale renewable materials. Graphic abstract

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Section: Nanofibril Morphology and Fibrillation Behaviormentioning

confidence: 71%

Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics

et al. 2020

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“…The combination of the delignification and APS oxidation methods produced CNCs in a gel form. The gel-form of the CNCs indicated that the CNCs had higher surface charges on their surfaces [ 29 ]. The appearance of the CNCs was affected by the raw materials and the oxidation time.…”

Section: Resultsmentioning

confidence: 99%

Effect of Oxidation Time on the Properties of Cellulose Nanocrystals Prepared from Balsa and Kapok Fibers Using Ammonium Persulfate

et al. 2021

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This study aimed to evaluate the effect of ammonium persulfate’s (APS) oxidation time on the characteristics of the cellulose nanocrystals (CNCs) of balsa and kapok fibers after delignification pretreatment with sodium chlorite/acetic acid. This two-step method is important for increasing the zeta potential value and achieving higher thermal stability. The fibers were partially delignified using acidified sodium chlorite for four cycles, followed by APS oxidation at 60 °C for 8, 12, and 16 h. The isolated CNCs with a rod-like structure showed an average diameter in the range of 5.5–12.6 nm and an aspect ratio of 14.7–28.2. Increasing the reaction time resulted in a gradual reduction in the CNC dimensions. The higher surface charge of the balsa and kapok CNCs was observed at a longer oxidation time. The CNCs prepared from kapok had the highest colloid stability after oxidation for 16 h (−62.27 mV). The CNCs with higher crystallinity had longer oxidation times. Thermogravimetric analysis revealed that the CNCs with a higher thermal stability had longer oxidation times. All of the parameters were influenced by the oxidation time. This study indicates that APS oxidation for 8–16 h can produce CNCs from delignified balsa and kapok with satisfactory zeta potential values and thermal stabilities.

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“…The effects of suspension pH value, carboxyl content, and addition of cations have been commonly studied as well (Besbes, Alila, & Boufi, 2011;Benhamou et al, 2014;Dong, Snyder, Williams, & Andzelm, 2013;Jowkarderis & van de Ven, 2014;Jowkarderis, & van de Ven, 2015;Mendoza et al, 2018b;Naderi & Lindström, 2016;Saito, Uematsu, Kimura, Enomae, & Isogai, 2011;Zander et al, 2014). All rheological investigations have shown that TEMPO-NFC hydrogels exhibit shear thinning and thixotropic behavior (Benhamou et al, 2014;Lasseuguette et al, 2008;Mendoza, Gunawardhana, Batchelor, & Garnier, 2018a;Mendoza et al, 2018b;Saito et al, 2007). Despite important reduction of particle swelling ability and suspension viscoelasticity that have been observed when nanocelluloses of different types were dried and re-dispersed in water (Hubbe et al, 2017;Naderi, Lindström, Sundstrom, & Flodberg, 2015a;Okiyama, Motoki, & Yamanaka, 1993;Peng, Gardner, & Han, 2012;Voronova, Zakharov, Kuznetsov, & Surov, 2012;Zepic et al, 2014;Zimmermann et al, 2016), the accessibility of dried nanocellulose offers potentials for novel TEMPO-NFC hydrogel blends and applications.…”

Section: Introductionmentioning

confidence: 99%

Rheology of aqueous dispersions of Laponite and TEMPO-oxidized nanofibrillated cellulose

Šebenik

Lapasin

Krajnc

2020

Carbohydrate Polymers

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The viscoelastic and flow properties of aqueous Laponite/TEMPO-oxidized nanofibrillated cellulose (TEMPO-NFC) systems are investigated with the aim to study the effect of content and proportion of both components on the properties. Both Laponite and TEMPO-NFC aqueous dispersions can find numerous applications in different fields (from industrial to biomedical one) due to their structural and rheological properties. The most important effects of blending are observed at low Laponite fractions, also with qualitative changes in the shape of the flow curves and mechanical spectra. Positive synergistic effects are ascribed to the interpenetration and electrostatic interactions between TEMPO-NFC fibrils and Laponite nanodisks. These mechanisms are more effective in Laponite-poor blends when a minority of clay nanoparticles and its aggregated forms are distributed within the nanocellulose matrix, acting as bridging agents between polymer nanofibrils. The synergistic effects are compared to those observed for Laponite blends with a nonionic biopolymer, scleroglucan.

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Effects of fibre dimension and charge density on nanocellulose gels

Cited by 35 publications

References 38 publications

Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics

Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics

Effect of Oxidation Time on the Properties of Cellulose Nanocrystals Prepared from Balsa and Kapok Fibers Using Ammonium Persulfate

Rheology of aqueous dispersions of Laponite and TEMPO-oxidized nanofibrillated cellulose

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