Rheological characterization of flow inception of thixotropic yield stress fluids using vane and T-bar geometries

Teoman, Baran; Marron, Greggory; Potanin, Andrei

doi:10.1007/s00397-021-01282-4

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…The preparation procedure is the same as described elsewhere. 53,54 Firstly, XG is dispersed in glycerin using an Ika-Werke Eurostar overhead mixer (Ika-Works Inc., USA) for 30 min at 500 rpm. Water is added, and the solution is mixed for another 30 min at 300 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…AFM measurements are performed on solutions containing 4.5 wt % XG, 0.45 wt % ZnCl 2 , 72.55 wt % deionized (DI) water, and 22.5 wt % glycerin. The preparation procedure is the same as described elsewhere. , Firstly, XG is dispersed in glycerin using an Ika-Werke Eurostar overhead mixer (Ika-Works Inc., USA) for 30 min at 500 rpm. Water is added, and the solution is mixed for another 30 min at 300 rpm.…”

Section: Methodsmentioning

confidence: 99%

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Modeling of the Effects of Metal Complexation on the Morphology and Rheology of Xanthan Gum Polysaccharide Solutions

et al. 2021

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Polysaccharide solutions commonly contain metal ions, which form cross-linking complexes with polymer ligands and significantly affect the polymer morphology and solution rheology. Here, we study by multiscale computational modeling complemented with atomic force microscopy (AFM) measurements the molecular mechanisms of metal complexation with examples of xanthan gum (XG) solutions containing ZnCl2. We develop original atomistic molecular dynamics (MD) and coarse-grained dissipative particle dynamics (DPD) models for XG chains of different compositions and Zn complexation. MD simulations reveal that Zn dramatically affects conformations of individual XG chains, causing a reduction in the radius of gyration by the formation of various types of intrachain cross-linking that are enhanced by the increased pyruvate content in the chains. DPD simulations at the static conditions and under the shear flow show that salt addition leads to gelation in XG systems via a sol–gel transition due to enhanced interchain cross-linking. Two morphological transitions occur in the shear flow: an orientational transition to a nematic phase with XG chains aligned in the direction of flow and a bundling transition accompanied by a reverse gel–sol transition at high Zn concentrations. The presence of the increased pyruvate content in the chains leads to stronger aggregation and stiffer aggregates, in qualitative agreement with AFM results. The proposed computational methodology of modeling the effects of metal complexation and chain composition on morphological and rheological properties may be extended and applied to various polysaccharide systems.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Modeling of the Effects of Metal Complexation on the Morphology and Rheology of Xanthan Gum Polysaccharide Solutions

et al. 2021

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“…This means that the yield stress for thixotropic soft matters can be different depending on the prehistory of deformations reflecting a different structure of the matter in the gel-like state. These properties of thixotropic media are inherent not only in gelled waxy oil but also in other multicomponent materials, for example, Laponite suspensions [ 140 ], hydrogels of polysaccharides [ 141 , 142 ], colloidal gels [ 143 ], Carbopol [ 77 , 78 ], and as-spun fibers from polymer solutions.…”

Section: On the Yield Stress In Soft Mattermentioning

confidence: 99%

Rheology of Gels and Yielding Liquids

Malkin,

Derkach,

Kulichikhin

2023

Gels

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In this review, today’s state of the art in the rheology of gels and transition through the yield stress of yielding liquids is discussed. Gels are understood as soft viscoelastic multicomponent solids that are in the incomplete phase separation state, which, under the action of external mechanical forces, do not transit into a fluid state but rupture like any solid material. Gels can “melt” (again, like any solids) due to a change in temperature or variation in the environment. In contrast to this type of rheology, yielding liquids (sometimes not rigorously referred to as “gels”, especially in relation to colloids) can exist in a solid-like (gel-like) state and become fluid above some defined stress and time conditions (yield stress). At low stresses, their behavior is quite similar to that of permanent solid gels, including the frequency-independent storage modulus. The gel-to-sol transition considered in colloid chemistry is treated as a case of yielding. However, in many cases, the yield stress cannot be assumed to be a physical parameter since the solid-to-liquid transition happens in time and is associated with thixotropic effects. In this review, special attention is paid to various time effects. It is also stressed that plasticity is not equivalent to flow since (irreversible) plastic deformations are determined by stress but do not continue over time. We also discuss some typical errors, difficulties, and wrong interpretations of experimental data in studies of yielding liquids.

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“…They found that vane geometry was effective in eliminating wall slip and disturbing the macroscopic/bulk structure of the sample. Similarly, the vane rotor has become increasingly accepted in the study of agricultural by-products [38], geotechnical fields [39], daily necessities [40], etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear History on Solid–Liquid Transition of Particulate Gel Fuels

Li,

Xiao

et al. 2023

Gels

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Investigating the structural evolution of particulate gels is a very challenging task due to their vulnerability and true flow characteristics. In this work, deeper insight into the rheological properties of gel fuels filled with fumed silica (FS) and aluminum microparticles (Al MPs) was gained by changing shear procedures. Firstly, the flow curves were found to no longer follow the monotonic power law and exhibited subtle thixotropic responses. As the shear rate increased, the gel structure underwent a transition from local shear to bulk shear in the nonlinear region after yielding. This finding reveals the prevalence of nonideal local shear in industry. Secondly, the time-dependent rheological responses demonstrated that the strength spectrum of gel fuels depends on the applied shear rate, with stress relaxation more easily observed at lower shear rates. Those results involved the structural disruption, recovery, and equilibrium of particulate gels from two scales of shear rate and shear time.

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Rheological characterization of flow inception of thixotropic yield stress fluids using vane and T-bar geometries

Cited by 11 publications

References 28 publications

Modeling of the Effects of Metal Complexation on the Morphology and Rheology of Xanthan Gum Polysaccharide Solutions

Modeling of the Effects of Metal Complexation on the Morphology and Rheology of Xanthan Gum Polysaccharide Solutions

Rheology of Gels and Yielding Liquids

Effect of Shear History on Solid–Liquid Transition of Particulate Gel Fuels

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