Rheological behavior of cellulose nanocrystal suspension: Influence of concentration and aspect ratio

Wu, Qiang; Meng, Yonggang; Wang, Siqun; Li, Yanjun; Fu, Shenyun; Ma, Lingfei; Harper, David P.

doi:10.1002/app.40525

Cited by 108 publications

(75 citation statements)

References 38 publications

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“…This behavior is also described by Karppinen [33] and Wu et al [34] for diluted nanocellulose (fibers and rods) suspensions. The first one considers it as a consequence of the concentration proximity with the threshold concentration for gel-like behavior [33,34] . However, this phenomenon seems to be more complex.…”

Section: Oscillation Measurementssupporting

confidence: 75%

Cellulose nanomaterials: size and surface influence on the thermal and rheological behavior

2018

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ObstractCellulose nanocrystals (CNC) and nanofibrils (CNF) were obtained by acid hydrolyzis and mechanical treatment, respectively, of cellulosic fibers from paper. Additionally, surface modification was performed for CNC by neutralization (NaOH) and oxidation (TEMPO). The thermal stability, surface properties and rheological behavior of these nanomaterials were compared. A clear difference in CNC surface was found upon neutralization and oxidation treatments, leading to distinct thermal behaviors. Optical and rheological properties were found to be predominantly by the particles size, being strongly affected by inertial effects.

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Section: Oscillation Measurementssupporting

confidence: 75%

Cellulose nanomaterials: size and surface influence on the thermal and rheological behavior

2018

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“…This critical concentration (C* = 0.1 %) was proposed for both NCC [13] and MCC [17,48]. Wu et al [70] measured a slightly higher value for NCC (C* = 0.4 %). No model of critical concentration was presented or proposed for complex matrices.…”

Section: Observed Rheological Behaviourmentioning

confidence: 95%

Rheology of Lignocellulose Suspensions and Impact of Hydrolysis: A Review

Nguyen

Anne-Archard

Fillaudeau

2015

Advances in Biochemical Engineering/Biotechnology

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White biotechnologies have several challenges to overcome in order to become a viable industrial process. Achieving highly concentrated lignocellulose materials and releasing fermentable substrates, with controlled kinetics in order to regulate micro-organism activity, present major technical and scientific bottlenecks. The degradation of the main polymeric fractions of lignocellulose into simpler molecules is a prerequisite for an integrated utilisation of this resource in a biorefinery concept. The characterisation methods and the observations developed for rheology, morphology, etc., that are reviewed here are strongly dependent on the fibrous nature of lignocellulose, are thus similar or constitute a good approach to filamentous culture broths. This review focuses on scientific works related to the study of the rheological behaviour of lignocellulose suspensions and their evolution during biocatalysis. In order to produce the targeted molecules (synthon), the lignocellulose substrates are converted by enzymatic degradation and are then metabolised by micro-organisms. The dynamics of the mechanisms is limited by coupled phenomena between flow, heat and mass transfers in regard to diffusion (within solid and liquid phases), convection (mixing, transfer coefficients, homogeneity) and specific inhibitors (concentration gradients). As lignocellulose suspensions consist of long entangled fibres for the matrix of industrial interest, they exhibit diverse and complex properties linked to this fibrous character (rheological, morphological, thermal, mechanical and biochemical parameters). Among the main variables to be studied, the rheological behaviour of such suspensions appears to be determinant for process efficiency. It is this behaviour that will determine the equipment to be used and the strategies applied (substrate and biocatalysis feed, mixing, etc.). This review provides an overview of (i) the rheological behaviour of fibrous materials in suspension, (ii) the methods and experimental conditions for their measurements, (iii) the main models used and (iv) their evolution during biocatalytic reactions with a focus on enzymatic hydrolysis.

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“…75 Using shorter particles as stabilizing agents produced more individualized droplets where as long CNCs bridged droplets creating network-like emulsions. Aspect ratio not only affects interfacial behaviour but impacts, rheological properties, 73 reinforcing capability, 76 and packing of CNCs. 118 Particles with higher aspect ratios, form gels and percolated networks at significantly lower concentrations than shorter particles, potentially reducing the amount of material required for specific applications.…”

Section: "µM"mentioning

confidence: 99%

“…CNCs produced without oligosaccharide layers were observed to be more viscous and less colloidally stable in high ionic strength environments. These studies emphasize that thorough understanding of CNC properties prior to use is critical as differences in particle dimension and charge density can greatly affect the rheological, 73 colloidal, 74 interfacial, 75 and reinforcing properties. 76 Along with the hydrolysis conditions, post extraction treatments such as sonication or purification can further impact CNC properties and behaviour.…”

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confidence: 99%

Benchmarking Cellulose Nanocrystals: From the Laboratory to Industrial Production

2016

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Abstract:The renewability, biocompatibility and mechanical properties of cellulose nanocrystals (CNCs) have made them an attractive material for numerous composite, biomedical and rheological applications. However, for CNCs to shift from laboratory curiosity to commercial applications, researchers must transition from CNCs extracted at the bench scale to material produced at an industrial scale. There are a number of companies currently producing kilogram to ton per day quantities of sulfuric acid-hydrolyzed CNCs, as well as other nanocelluloses, as described herein.With the recent intensification of industrially produced CNCs, the variety of cellulose sources, hydrolysis methods and purification procedures, characterization of these materials becomes critical. This has further been justified by the past two decades of research which demonstrate that CNC stability and behaviour is highly dependent on surface chemistry, surface charge density and particle size. This work outlines key test methods that should be employed to characterize these properties to ensure a "known" starting material and consistent performance.Of the sulfuric acid-extracted CNCs examined, industrially produced material compared well with laboratory-made CNCs, exhibiting similar charge density, colloidal and thermal stability, crystallinity, morphology and self-assembly behaviour. In addition, it was observed that further purification of CNCs, using Soxhlet extraction in ethanol, had minimal impact on nanoparticle properties and is unlikely to be necessary for many applications. Overall the current standing of industrially produced CNCs is positive suggesting that the evolution to commercial scale applications will not be hindered by CNC production.

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Rheological behavior of cellulose nanocrystal suspension: Influence of concentration and aspect ratio

Cited by 108 publications

References 38 publications

Cellulose nanomaterials: size and surface influence on the thermal and rheological behavior

Cellulose nanomaterials: size and surface influence on the thermal and rheological behavior

Rheology of Lignocellulose Suspensions and Impact of Hydrolysis: A Review

Benchmarking Cellulose Nanocrystals: From the Laboratory to Industrial Production

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