Shear-induced anisotropic microstructure in phase-separated biopolymer mixtures

Wolf, Bettina; Scirocco, Rossella; Frith, William J.; Norton, Ian T.

doi:10.1016/s0268-005x(99)00062-4

Cited by 123 publications

(55 citation statements)

References 11 publications

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“…34 Microstructures can be also fabricated starting from mixtures of phase-separated biopolymers when at least one component is able to gel. 36,37 In that case shear field with simultaneous cooling can be used to decreases, a situation that influences rheology and textural properties of the mixtures. 40 Furthermore, a remarkable change in the continuity of the mixtures occurs as polysaccharide concentration increases (from left to right).…”

Section: Figure X3 Around Herementioning

confidence: 99%

Influence of pH on mechanical relaxations in high solids LM-pectin preparations

Alba

Kasapis

Kontogiorgos

2015

Carbohydrate Polymers

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Section: Figure X3 Around Herementioning

confidence: 99%

Influence of pH on mechanical relaxations in high solids LM-pectin preparations

Alba

Kasapis

Kontogiorgos

2015

Carbohydrate Polymers

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“…Interesting granular phenomena like yielding and jamming (Liu and Nagel, 1998;Bi et al, 2011;Luding, 2016;Kumar and Luding, 2016), dilatancy (Cates et al, 2005;Van Hecke, 2009;Yang et al, 2015), shear-band localization (Alshibi and Sture, 2000;Singh et al, 2014), history-dependence (Thakur et al, 2014), and anisotropy (Radjai et al, 1996;Majmudar and Behringer, 2005) have attracted significant scientific interest over the past decades (Savage and Hutter, 1989;Cundall, 1989;Radjai et al, 1999;Wolf et al, 2000;† GDR-MiDi, 2004;Tomas, 2005;Alonso-Marroquin and Herrmann, 2004;Luding 2005aLuding , b, 2008. Various laboratory element tests can be performed to study the bulk behaviour of granular materials (Schwedes, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Cohesion on Powder Yielding and Flow

Shi

Mohanty

Chakravarty

et al. 2018

KONA

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The bulk properties of powders depend on material characteristics and size of the primary particles. During storage and transportation processes in the powder processing industry, the material undergoes various modes of deformation and stress conditions, e.g., due to compression or shear. In many applications, it is important to know when powders are yielding, i.e. when they start to flow under shear; in other cases it is necessary to know how much stress is needed to keep them flowing. The measurement of powder yield and flow properties is still a challenge and will be addressed in this study. In the framework of the collaborative project T-MAPPP, a large set of shear experiments using different shear devices, namely the Jenike shear tester, the ELE direct shear tester, the Schulze ring shear tester and the FT4 powder rheometer, have been carried out on eight chemically-identical limestone powders of different particle sizes in a wide range of confining stresses. These experiments serve two goals: i) to test the reproducibility/ consistency among different shear devices and testing protocols; ii) to relate the bulk behaviour to microscopic particle properties, focusing on the effect of particle size and thus inter-particle cohesion. The experiments show high repeatability for all shear devices, though some of them show more fluctuations than others. All devices provide consistent results, where the FT4 powder rheometer gives lower yield/steady state stress values, due to a different pre-shearing protocol. As expected, the bulk cohesion decreases with increasing particle size (up to 150 μm), due to the decrease of inter-particle cohesion. The bulk friction, characterized in different ways, is following a similar decreasing trend, whereas the bulk density increases with particle size in this range. Interestingly, for samples with particle sizes larger than 150 μm, the bulk cohesion increases slightly, while the bulk friction increases considerably-presumably due to particle interlocking effects-up to magnitudes comparable to those of the finest powders. Furthermore, removing the fines from the coarse powder samples reduces the bulk cohesion and bulk density, but has a negligible effect on the bulk friction. In addition to providing useful insights into the role of microscopically attractive, van der Waals, gravitational and/or compressive forces for the macroscopic bulk powder flow behaviour, the experimental data provide a robust database of cohesive and frictional fine powders for industrially relevant designs such as silos, as well as for calibration and validation of models and computer simulations.

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“…When subjected to low levels of shear, the dispersed phase of these aqueous emulsions tends to form spherical droplets. As shearing rates are increased, these droplets begin to elongate into first ellipsoidal structures and then fibers or threads at higher shear rates (Wolf, Scirocco, Frith, & Norton, 2000). The extent of particle deformation is related to the viscosity of the solution, the shear rate, the particle diameter, and the interfacial tension (Van Puyvelde, Antonov, & Moldenaers, 2002).…”

Section: Shearing Methodsmentioning

confidence: 99%

Structured biopolymer-based delivery systems for encapsulation, protection, and release of lipophilic compounds

2011

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Available at: https://works.bepress.com/djulian_mcclements/160/ This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. such as u-3 rich oils, conjugated linoleic acid (CLA), oil-soluble vitamins, flavors, colors, and nutraceuticals. This article provides an overview of a number of different approaches that can be used to create structured delivery systems based on biopolymers, including molecular complexation, coacervation, thermodynamic incompatibility, moulding, and extrusion methods. These delivery systems can be produced from food-grade ingredients using simple processing operations (e.g., mixing, homogenizing, and thermal processing). The structure, production, performance, and potential applications of each type of structured delivery system are discussed.

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Shear-induced anisotropic microstructure in phase-separated biopolymer mixtures

Cited by 123 publications

References 11 publications

Influence of pH on mechanical relaxations in high solids LM-pectin preparations

Influence of pH on mechanical relaxations in high solids LM-pectin preparations

Effect of Particle Size and Cohesion on Powder Yielding and Flow

Structured biopolymer-based delivery systems for encapsulation, protection, and release of lipophilic compounds

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