Non-linear viscoelasticity and temporal behavior of typical yield stress fluids: Carbopol, Xanthan and Ketchup

The viscoelastic properties of yield stress fluids are difficult to measure outside the linear viscoelastic regime, in particular above their yield stress. These properties are investigated for several common yield stress fluids using inertio-elastic oscillations. From this coupling between the inst...

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Bibliographic Details
Published in:Rheologica acta 2010-03, Vol.49 (3), p.305-314
Main Authors: Benmouffok-Benbelkacem, G., Caton, F., Baravian, C., Skali-Lami, S.
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Cross-disciplinary physics: materials science
rheology
Deformation
material flow
Elasticity
Exact sciences and technology
Fluid dynamics
Fluids
Food industries
Food Science
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
Fundamental areas of phenomenology (including applications)
Materials Science
Mechanical Engineering
Non-newtonian fluid flows
Nonlinear viscoelasticity
Original Contribution
Physical properties
Physics
Polymer industry, paints, wood
Polymer Sciences
Properties and testing
Rheological properties
Rheology
Soft and Granular Matter
Technology of polymers
Viscoelasticity
Xanthan
Yield strength
Yield stress
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Summary:The viscoelastic properties of yield stress fluids are difficult to measure outside the linear viscoelastic regime, in particular above their yield stress. These properties are investigated for several common yield stress fluids using inertio-elastic oscillations. From this coupling between the instrument’s inertia and the viscoelasticity of the materials, the complete simple shear rheology can be determined, including viscoelasticity under flow. Findings show that the tested materials have an almost constant elasticity below and above the yield stress, even for applied stresses several times larger than the yield stress. Moreover, the temporal behavior of the materials is unambiguously determined. Concentrated Xanthan is shown to be thixotropic, while Ketchup mainly shows retarded viscoelasticity. Carbopol does not show long-term temporal dependance but apparently exhibits fracturation.
ISSN:0035-4511
1435-1528
DOI:10.1007/s00397-010-0430-4