Shear thinning in non-Brownian suspensions

We study the flow of suspensions of non-Brownian particles dispersed into a Newtonian solvent. Combining capillary rheometry and conventional rheometry, we evidence a succession of two shear thinning regimes separated by a shear thickening one. Through X-ray radiography measurements, we show that du...

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Bibliographic Details
Published in:Soft matter 2018, Vol.14 (6), p.879-893
Main Authors: Chatté, Guillaume, Comtet, Jean, Niguès, Antoine, Bocquet, Lydéric, Siria, Alessandro, Ducouret, Guylaine, Lequeux, François, Lenoir, Nicolas, Ovarlez, Guillaume, Colin, Annie
Format: Article
Language:English
Subjects:
Atomic force microscopy
Brownian motion
Coefficient of friction
Concentration (composition)
Condensed Matter
Friction
Microscopes
Particulates
Physics
Radiography
Rheological properties
Rheology
Rheometry
Shear
Shear thickening (liquids)
Shear thinning (liquids)
Soft Condensed Matter
Thickening
Thinning
X-ray radiography
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Summary:We study the flow of suspensions of non-Brownian particles dispersed into a Newtonian solvent. Combining capillary rheometry and conventional rheometry, we evidence a succession of two shear thinning regimes separated by a shear thickening one. Through X-ray radiography measurements, we show that during each of those regimes, the flow remains homogeneous and does not involve particle migration. Using a quartz-tuning fork based atomic force microscope, we measure the repulsive force profile and the microscopic friction coefficient μ between two particles immersed into the solvent, as a function of normal load. Coupling measurements from those three techniques, we propose that (1) the first shear-thinning regime at low shear rates occurs for a lubricated rheology and can be interpreted as a decrease of the effective volume fraction under increasing particle pressures, due to short-ranged repulsive forces and (2) the second shear thinning regime after the shear-thickening transition occurs for a frictional rheology and can be interpreted as stemming from a decrease of the microscopic friction coefficient at large normal load. We study the flow of suspensions of non-Brownian particles dispersed in a Newtonian solvent.
ISSN:1744-683X
1744-6848
DOI:10.1039/c7sm01963g