Shear-induced fragmentation of Laponite suspensions

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dc.creatorGibaud, Thomas
dc.creatorBarentin, Catherine
dc.creatorTaberlet, Nicolas
dc.creatorManneville, Sébastien
dc.date2009-04-06
dc.date.accessioned2026-07-07T13:00:47Z
dc.date.available2026-07-07T13:00:47Z
dc.descriptionSimultaneous rheological and velocity profile measurements are performed in a smooth Couette geometry on Laponite suspensions seeded with glass microspheres and undergoing the shear-induced solid-to-fluid (or yielding) transition. Under these slippery boundary conditions, a rich temporal behaviour is uncovered, in which shear localization is observed at short times, that rapidly gives way to a highly heterogeneous flow characterized by intermittent switching from plug-like flow to linear velocity profiles. Such a temporal behaviour is linked to the fragmentation of the initially solid sample into blocks separated by fluidized regions. These solid pieces get progressively eroded over time scales ranging from a few minutes to several hours depending on the applied shear rate $\dotγ$. The steady-state is characterized by a homogeneous flow with almost negligible wall slip. The characteristic time scale for erosion is shown to diverge below some critical shear rate $\dotγ^\star$ and to scale as $(\dotγ-\dotγ^\star)^{-n}$ with $n\simeq 2$ above $\dotγ^\star$. A tentative model for erosion is discussed together with open questions raised by the present results.
dc.description19 pages, 13 figures, submitted to Soft Matter
dc.identifierhttps://arxiv.org/abs/0904.0863
dc.identifierhttp://arxiv.org/abs/0904.0863
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225948
dc.subjectSoft Condensed Matter
dc.titleShear-induced fragmentation of Laponite suspensions
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