Viscosity measurements of dilute aqueous suspensions of cellulose nanocrystals using a rolling ball viscometer

González-Labrada, Erick; Gray, Derek G.

doi:10.1007/s10570-012-9746-9

Cited by 24 publications

(18 citation statements)

References 26 publications

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“…Their applicability is reduced for fibre suspensions. The works of Luukkonen et al [16] and of Gonzalez-Labrada and Gray [14] on nano-and microcrystalline cellulose can be mentioned. Fine rheometry analysis was reported by Tozzi et al [22] using magnetic resonance imaging (MRI) to determine the velocity field in a portion of a cylindrical duct.…”

Section: Rheological Measurement Devicesmentioning

confidence: 96%

“…8), it decreases as the substrate concentration increases, thus underlining the fact that the non-Newtonian behaviour becomes increasingly pronounced as the concentration rises. With NCC, for example, n decreases from 0.962 to 0.75 for concentrations of 0.6 to 20 gdm L −1 [14], and for corn stover suspensions, n decreases from 0.91 to 0.5 for concentrations of 50 to 300 gdm L −1 . For particle diameters less than 1000 µm, n clearly tends to 1 as substrate concentration tends to 0, the behaviour of the suspension tends towards that of water [14,20,28,51].…”

Section: Structure and Consistency Indexmentioning

confidence: 98%

“…With NCC, for example, n decreases from 0.962 to 0.75 for concentrations of 0.6 to 20 gdm L −1 [14], and for corn stover suspensions, n decreases from 0.91 to 0.5 for concentrations of 50 to 300 gdm L −1 . For particle diameters less than 1000 µm, n clearly tends to 1 as substrate concentration tends to 0, the behaviour of the suspension tends towards that of water [14,20,28,51]. For particle diameters greater than 1000 µm, this tendency is not so clear on the graphs and n does not seem to tend to 1 as the concentration tends to 0.…”

Section: Structure and Consistency Indexmentioning

confidence: 98%

“…Knutsen and Liberatore [50] Rheometer/four-bladed vane (narrow gap) τ 0 (viscometry), G′, G″ Agoda-Tandjawa et al [24] Rheometer/parallel plates µ and G′, G″ Derakhshandeh et al [37] Viscometer/four-bladed vane + UD velocimetry μ, τ 0 (viscometry + velocimetry) Chaussy et al [39] Industrial disc refiner µ Samaniuk et al [33] Mixing system/counter-rotating screw elements Torque Wiman et al [9] Rheometer/four-bladed vane µ and G′, G″ Gonzalez-Labrada and Gray [14] Rolling ball viscometer µ Saarikoski et al [25] Rheometer/concentric cylinder G′, G″ Nguyen et al [51] Rheometer/Serrated plates + Mixing system/four-pitched-blade turbine µ and G′, G″, Torque Mohtaschemi et al [52] Viscometer/four-bladed vane μ, τ 0…”

Section: Dasari Andmentioning

confidence: 99%

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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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Section: Rheological Measurement Devicesmentioning

confidence: 96%

Section: Structure and Consistency Indexmentioning

confidence: 98%

Section: Structure and Consistency Indexmentioning

confidence: 98%

Section: Dasari Andmentioning

confidence: 99%

See 2 more Smart Citations

Rheology of Lignocellulose Suspensions and Impact of Hydrolysis: A Review

Nguyen

Anne-Archard

Fillaudeau

2015

Advances in Biochemical Engineering/Biotechnology

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“…On the other hand, no ordered structure can be achieved in cellulose nanofibers (CNFs) because gelation occurs first, due to their higher aspect ratio and flexibility (Paakko et al 2007). Rheological properties of aqueous suspensions based on NCCs and CNFs have been investigated in recent years (Bercea and Navard 2000;González-Labrada and Gray 2012;Jowkarderis and van de Ven 2014;Lu et al 2014;Paakko et al 2007;Shafiei-Sabet et al 2012;Ureña-Benavides et al 2011). Particularly, intrinsic viscosity measurements have been performed to provide a better understanding of the particles themselves as discussed below.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic viscosity of suspensions of electrosterically stabilized nanocrystals of cellulose

et al. 2015

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Electrosterically stabilized nanocrystals of cellulose (ENCCs) have emerged recently as new cellulose nanoparticles among common nanocrystals of cellulose (NCCs) and cellulose nanofibers. ENCC has a special structure being composed of a crystal with protruded amorphous chains at each endcaps bearing carboxyl groups. Here, we studied the intrinsic viscosity of aqueous suspensions of ENCCs as a function of pH and ionic strength. Low pH or high ionic strength reduced the ENCCs to rigid rod-like particles while a polyelectrolyte-like behavior was observed for suspensions of ENCCs around pH 7 and at low ionic strength. The pH had a great effect on charges due to both deprotonation of carboxyl groups and counter-ion effect, while the ionic strength only affected the surface charges of the particles. The zeta potential of ENCC suspensions was measured as a function of pH and ionic strength to establish a link between particle charges and the intrinsic viscosity. Finally, the Fedors model was used to compare our data in the case of rigid rod-like body behavior with literature data on NCC suspensions and the model was shown to be unsuitable.

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Rheological Aspects of Cellulose Nanomaterials: Governing Factors and Emerging Applications

et al. 2021

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of nanomaterials from green, low-cost, abundant, renewable, and biodegradable natural resources. One such attractive bioresource is cellulose, the most abundant biopolymer on earth, which is widely present in various forms of renewable biomass, such as trees, plants, tunicates, and bacteria.Structurally, cellulose is a linear, high molecular weight polysaccharide with repeating glucose units linked by 1-4 glycosidic bonds. Owing to the presence of hydroxyl groups, those linear chains of glucose units link together through van der Waals forces and intermolecular hydrogen bonding to form elementary fibrils, which are further packed into larger aggregates known as microfibrils. [3] Cellulose fibrils consist of disordered (amorphous) regions and highly ordered (crystalline) regions. In the crystalline regions, cellulose chains are closely packed together in highly ordered fashion (parallel to the direction of fibril length), dictated by the intricate intraand intermolecular hydrogen bonding; whereas in the amorphous regions, cellulose chain stacking is less ordered and not as closely packed. Therefore, the amorphous regions are more vulnerable to both physical disintegration and chemical hydrolysis in comparison with crystalline regions. When cellulose is prepared in nano-scale fibrillar or crystalline forms, it is broadly referred to as cellulose nanomaterials (CNMs).The isolation, characterization, modification, and application of CNMs are currently receiving much attention. Understanding Cellulose nanomaterials (CNMs), mainly including nanofibrillated cellulose (NFC) and cellulose nanocrystals (CNCs), have attained enormous interest due to their sustainability, biodegradability, biocompatibility, nanoscale dimensions, large surface area, facile modification of surface chemistry, as well as unique optical, mechanical, and rheological performance. One of the most fascinating properties of CNMs is their aqueous suspension rheology, i.e., CNMs helping create viscous suspensions with the formation of percolation networks and chemical interactions (e.g., van der Waals forces, hydrogen bonding, electrostatic attraction/repulsion, and hydrophobic attraction). Under continuous shearing, CNMs in an aqueous suspension can align along the flow direction, producing shear-thinning behavior. At rest, CNM suspensions regain some of their initial structure immediately, allowing rapid recovery of rheological properties. These unique flow features enable CNMs to serve as rheological modifiers in a wide range of fluid-based applications. Herein, the dependence of the rheology of CNM suspensions on test protocols, CNM inherent properties, suspension environments, and postprocessing is systematically described. A critical overview of the recent progress on fluid applications of CNMs as rheology modifiers in some emerging industrial sectors is presented as well. Future perspectives in the field are outlined to guide further research and development in using CNMs as the next generation rheological modifiers.

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Viscosity measurements of dilute aqueous suspensions of cellulose nanocrystals using a rolling ball viscometer

Cited by 24 publications

References 26 publications

Rheology of Lignocellulose Suspensions and Impact of Hydrolysis: A Review

Rheology of Lignocellulose Suspensions and Impact of Hydrolysis: A Review

Intrinsic viscosity of suspensions of electrosterically stabilized nanocrystals of cellulose

Rheological Aspects of Cellulose Nanomaterials: Governing Factors and Emerging Applications

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