On different ways of measuring “the” yield stress

Dinkgreve, M.; Paredes, José; Denn, Morton M.; Bonn, Daniel

doi:10.1016/j.jnnfm.2016.11.001

Cited by 294 publications

(211 citation statements)

References 52 publications

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“…3, A and B). To identify the yield stress necessary to induce flow different methods can be employed ( 21, 22 ). In this study we used the crossover of G’ and G’’ to identify the flow point.…”

Section: Resultsmentioning

confidence: 99%

3D Bioprinting of Architected Hydrogels from Entangled Microstrands

Kessel¹,

Lee²,

Bonato³

et al. 2019

Preprint

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31Hydrogels are an excellent biomimetic of the extracellular matrix and have found great 32 use in tissue engineering. Nanoporous monolithic hydrogels have limited mass transport, 33 restricting diffusion of key biomolecules. Structured microbead-hydrogels overcome some 34 of these limitations, but suffer from lack of controlled anisotropy. Here we introduce a 35 novel method for producing architected hydrogels based on entanglement of microstrands. 36 The microstrands are mouldable and form a porous structure which is stable in water. 37 Entangled microstrands are useable as bioinks for 3D bioprinting, where they align during 38 the extrusion process. Cells co-printed with the microstrands show excellent viability and 39 augmented matrix deposition resulting in a modulus increase from 2.7 kPa to 780.2 kPa 40 after 6 weeks of culture. Entangled microstands are a new class of bioinks with 41 unprecedented advantages in terms of scalability, material versatility, mass transport, 42 showing foremost outstanding properties as a bioink for 3D printed tissue grafts. 43 44 45 46 47 48 49 50 129 130 131 Results 132 133 Entangled Microstrand Materials are Mouldable, Stable in Water and Macroporous 134 135Here we report on a robust and versatile method for preparing 'entangled' microstrands. 136 Bulk hyaluronan-methacrylate (HA-MA) hydrogels were mechanically pressed through a 137

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Section: Resultsmentioning

confidence: 99%

3D Bioprinting of Architected Hydrogels from Entangled Microstrands

Kessel¹,

Lee²,

Bonato³

et al. 2019

Preprint

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show abstract

“…Many materials found in daily life exhibit properties characteristic of either solids or liquids, depending on the imposed stress. At small stresses, these materials deform essentially in an elastic manner, but flow once a critical stress is exceeded; this critical value is called the yield stress (τ c ), and materials exhibiting a yield stress are called yield stress materials (Dinkgreve et al 2016). Many methods have been proposed for determining the yield stress; it has been demonstrated that variations of more than one order of magnitude can arise, however, are dependent on the method used and the handling of the sample.…”

Section: Food Technology and Economy Engineering And Physical Propermentioning

confidence: 99%

Rheological behaviour in the interaction of lecithin and guar gum for oil-in-water emulsions

Zapateiro¹,

Quintana²,

Cano³

2018

Czech J. Food Sci.

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Quintana-Martinez S., Morales-Cano A., García-Zapateiro L. (2018): Rheological behaviour in the interaction of lecithin and guar gum for oil-in-water emulsions. Czech J. Food Sci., 36: 73-80.The effects of guar gum and lecithin concentrations (1, 0.75, and 0.5%wt) on the stability of oil in water emulsion were investigated. All emulsions can be stabilized at the studied concentrations of stabilizers. The samples tested by steady shear flow and dynamic viscoelasticity tests were carried out to characterize the rheological behaviour of emulsions as influenced by concentration. Emulsions presented a non-Newtonian behaviour type with shear thinning and flow curves that could be described by the Carreau model. The dynamic viscoelastic properties characterized by an oscillatory frequency sweep under small deformation conditions showed fluid-like viscoelastic behaviour. The interaction of the stabilizers in the mixture with each other at the interface appears to play a decisive role for the stabilization of emulsions.

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“…7. This is a revealing way to visualize the data, as shown by Christopoulou et al (2009) for a colloidal glass and by Dinkgreve et al (2016) for nonthixotropic yield-stress fluids including emulsions, foam, and Carbopol. There is a linear stress-strain relation with a modulus of 235 Pa at all frequencies up to a strain of about 0.1, after which there is a small frequency dependence that is followed by transition to a softer material.…”

Section: Oscillatory Measurementsmentioning

confidence: 99%

“Everything flows?”: elastic effects on startup flows of yield-stress fluids

2017

Self Cite

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It is now 30 years since Barnes and Walters published a provocative paper in which they asserted that the yield stress is an experimental artifact. We now know that the situation is far more complicated than understood at the time, and that the mechanics of the solid material prior to yielding must be considered carefully. In this paper, we examine the response of a well-studied "simple" yield-stress material, namely a Carbopol gel that exhibits no thixotropy, and demonstrate the significance of the pre-yielding behavior through a number of elementary measurements.

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On different ways of measuring “the” yield stress

Cited by 294 publications

References 52 publications

3D Bioprinting of Architected Hydrogels from Entangled Microstrands

3D Bioprinting of Architected Hydrogels from Entangled Microstrands

Rheological behaviour in the interaction of lecithin and guar gum for oil-in-water emulsions

“Everything flows?”: elastic effects on startup flows of yield-stress fluids

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