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Issue 16, 2012
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Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale

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Abstract

We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.

Graphical abstract: Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale

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Publication details

The article was received on 11 Jan 2012, accepted on 14 Feb 2012 and first published on 08 Mar 2012


Article type: Communication
DOI: 10.1039/C2SM25077B
Citation: Soft Matter, 2012,8, 4310-4313
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    Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale

    N. Kumar, S. Majumdar, A. Sood, R. Govindarajan, S. Ramaswamy and A. K. Sood, Soft Matter, 2012, 8, 4310
    DOI: 10.1039/C2SM25077B

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