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Issue 4, 2013
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Rheochaos and flow instability phenomena in a nonionic lamellar phase

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Abstract

In this study we report on instability phenomena in a solution where shear induces multilamellar vesicles (MLVs) from a lamellar phase. A shear-thickening regime has been observed for hexadecyl tetraethylene glycol ether (C16E4) dissolved in D2O at 40 °C. In this regime, unstable temporal viscosity behavior, i.e. periodic oscillations, has been observed at 2, 5 and 10 s−1. Moreover at a shear rate of 10 s−1 shear banding manifests itself as the occurrence of transparent and turbid bands stacked along the vorticity direction. We perform time-resolved-rheo-small angle neutron scattering (rheo-SANS) experiments to understand the nature of the viscosity oscillations and spatial-resolved experiments to obtain a structural characterization of vorticity bands.

Graphical abstract: Rheochaos and flow instability phenomena in a nonionic lamellar phase

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Publication details

The article was received on 11 Sep 2012, accepted on 08 Nov 2012 and first published on 22 Nov 2012


Article type: Paper
DOI: 10.1039/C2SM27101J
Citation: Soft Matter, 2013,9, 1133-1140
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    Rheochaos and flow instability phenomena in a nonionic lamellar phase

    L. Gentile, B. F. B. Silva, S. Lages, K. Mortensen, J. Kohlbrecher and U. Olsson, Soft Matter, 2013, 9, 1133
    DOI: 10.1039/C2SM27101J

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