Nanofibrillated cellulose: properties reinvestigated

Naderi, Ali

doi:10.1007/s10570-017-1258-1

Cited by 61 publications

(38 citation statements)

References 61 publications

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“…There is, however, a lack of universally accepted protocols for this type of characterization, which is a problem when comparing results from different research groups. Additionally many CNF materials are inherently unstable, and require specific protocols [219,220]. Hence, Naderi and Lindström [221] stressed that pre-shearing is a pre-requisite for obtaining reproducible results for unstable CNF materials.…”

Section: Rheology Of Cnf Materialsmentioning

confidence: 99%

“…There are also reports of higher values such as for enzymatically liberated CNF material [198], where a value around 3.0 was obtained for uncharged CNF material [232]. Naderi [220] speculated that the inclusion of data close to the critical network concentration or incorrect selection of CNF suspensions (in the fitting process) as possible causes for these discrepancies.…”

Section: Figure 10mentioning

confidence: 99%

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Nanocellulose as a natural source for groundbreaking applications in materials science: Today’s state

et al. 2018

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Nanocelluloses are natural materials with at least one dimension in the nano-scale. They combine important cellulose properties with the features of nanomaterials and open new horizons for materials science and its applications. The field of nanocellulose materials is subdivided into three domains: biotechnologically produced bacterial nanocellulose hydrogels, mechanically delaminated cellulose nanofibers, and hydrolytically extracted cellulose nanocrystals. This review article describes today's state regarding the production, structural details, physicochemical properties, and innovative applications of these nanocelluloses. Promising technical applications including gels/foams, thickeners/stabilizers as well as reinforcing agents have been proposed and research from last five years indicates new potential for groundbreaking innovations in the areas of cosmetic products, wound dressings, drug carriers, medical implants, tissue engineering, food and composites. The current state of worldwide commercialization and the challenge of reducing nanocellulose production costs are also discussed.

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Section: Rheology Of Cnf Materialsmentioning

confidence: 99%

Section: Figure 10mentioning

confidence: 99%

Nanocellulose as a natural source for groundbreaking applications in materials science: Today’s state

et al. 2018

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“…Cellulose fibers are exposed to high shear and pressure during the homogenization process, which will disintegrate cellulose fibers into the corresponding nanofibrils. Due to its excellent mechanical properties and environmental benefits, CNF can be used in a wide variety of applications such as composite materials, polymer films, foams, and in biomedical applications (Lavoine et al 2012;Kargarzadeh et al 2018;Bettaieb et al 2015;Naderi 2017;Siró and Plackett 2010;Tayeb et al 2018;Rocha et al 2018;Shanmugam et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Cellulose from the green macroalgae Ulva lactuca: isolation, characterization, optotracing, and production of cellulose nanofibrils

et al. 2020

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We report (1) successful extraction and characterization of cellulose from northern hemisphere green macroalgae Ulva lactuca (Ulva fenestrata) collected along the Swedish west coast and cultivated indoors under controlled conditions, followed by (2) its utilization in the production of lignin-free cellulose nanofibrils (CNF). Cellulose was extracted by sequential treatment with ethanol, hydrogen peroxide, sodium hydroxide, and hydrochloric acid, yielding a celluloserich insoluble fraction. The extracted cellulose was disintegrated into CNF using a mechanical homogenization process without any further enzymatic pretreatments. In addition, regenerated cellulose was prepared. XRD characterization of the CNF showed characteristic peaks for the cellulose I allomorph and confirmed that the nanofibrils were semicrystalline with a crystallinity index of 48%. Regenerated cellulose was mostly amorphous with an XRD pattern indicating the presence of the cellulose II allomorph. The cellulose fractions were essentially free from inorganic substances and thermally stable up to around 260°C. Structural mapping with CP-MAS 13 C-NMR sustains the cellulose content of CNF and regenerated cellulose, respectively, yet ion chromatography identified the presence of 10-15% xylose in the fractions. Optotracing was used as a novel and non-disruptive tool to selectively assess the polysaccharide composition of the cellulose fractions and produced CNF aiming to shed light on this hitherto non-resolved origin of xylose in Ulva cell wall matter. Fluorescence excitation and emission spectra of a panel of 4 oligothiophenes identified and verified the presence of cellulose and sustain the conclusion that the isolated fractions consist of cellulose intertwined with a small amount of a xylose-containing glucan copolymer.

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“…Over the past decade, there has been an explosive growth in MNFC research, including improved MNFC production technologies, surface functionalization, characterization techniques, composites processing, self-assembly, optical properties, and barrier properties. The applications of MNFC are already numerous, varying now from a rheology modifier in cements, inks, drilling fluids and cosmetics, to a wide spectrum of products such as supercapacitors, transparentflexible electronics, batteries, barrier/separation membranes, and antimicrobial films (Klemm et al 2011;Isogai 2013;Moon et al 2016;Naderi 2017). The rheological characteristics of various MNFC suspensions have become a widely discussed topic.…”

Section: Introductionmentioning

confidence: 99%

Pipe rheology of microfibrillated cellulose suspensions

Turpeinen

Jäsberg

Haavisto³

et al. 2019

Cellulose

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The shear rheology of two mechanically manufactured microfibrillated cellulose (MFC) suspensions was studied in a consistency range of 0.2-2.0% with a pipe rheometer combined with ultrasound velocity profiling. The MFC suspensions behaved at all consistencies as shear thinning power law fluids. Despite their significantly different particle size, the viscous behavior of the suspensions was quantitatively similar. For both suspensions, the dependence of yield stress and the consistency index on consistency was a power law with an exponent of 2.4, similar to some pulp suspensions. The dependence of flow index on consistency was also a power law, with an exponent of -0.36. The slip flow was very strong for both MFCs and contributed up to 95% to the flow rate. When wall shear stress exceeded two times the yield stress, slip flow caused drag reduction with consistencies higher than 0.8%. When inspecting the slip velocities of both suspensions as a function of wall shear stress scaled with the yield stress, a good data collapse was obtained. The observed similarities in the shear rheology of both the MFC suspensions and the similar behavior of some pulp fiber suspensions suggests that the shear rheology of MFC suspensions might be more universal than has previously been realized.

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Nanofibrillated cellulose: properties reinvestigated

Cited by 61 publications

References 61 publications

Nanocellulose as a natural source for groundbreaking applications in materials science: Today’s state

Nanocellulose as a natural source for groundbreaking applications in materials science: Today’s state

Cellulose from the green macroalgae Ulva lactuca: isolation, characterization, optotracing, and production of cellulose nanofibrils

Pipe rheology of microfibrillated cellulose suspensions

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