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Issue 26, 2012
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Transient and steady-state shear banding in aging soft glassy materials

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Abstract

Transient and steady-state shear banding in a Laponite suspension were studied by particle imaging velocimetry in Couette and cone and plate flow geometries on samples with varying age. The time evolution of the velocity profile and shear stress was measured simultaneously as a fixed shear rate was imposed on the sample. By varying the aging time of the rejuvenated samples, we examined the effect of the stress overshoot on the shear banding behavior. Transient banding only occurred for aged samples that showed a stress overshoot. However, steady-state banding occurred when the imposed shear rate was below a critical value, even in the absence of a stress overshoot or transient banding. These results were consistent for independently prepared samples with vastly different overall ages, and in different flow geometries with varying intrinsic stress gradients. Different mechanisms for transient and steady-state shear banding will be discussed.

Graphical abstract: Transient and steady-state shear banding in aging soft glassy materials

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Publication details

The article was received on 09 Feb 2012, accepted on 14 May 2012 and first published on 25 May 2012


Article type: Paper
DOI: 10.1039/C2SM25299F
Citation: Soft Matter, 2012,8, 6940-6949
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    Transient and steady-state shear banding in aging soft glassy materials

    J. D. Martin and Y. Thomas Hu, Soft Matter, 2012, 8, 6940
    DOI: 10.1039/C2SM25299F

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