Issue 4, 2013
From the journal:

Soft Matter

Rheochaos and flow instability phenomena in a nonionic lamellar phase

Luigi Gentile,*ab   Bruno F. B. Silva,b   Sebastian Lages,b   Kell Mortensen,c   Joachim Kohlbrecherd  and  Ulf Olssonb  

* Corresponding authors

a Department of Chemistry, University of Calabria, P. Bucci 14C, 87036 Rende, Italy
E-mail: luigi.gentile@unical.it

b Physical Chemistry 1, Kemicentrum, Lund University, Box 124, 221 00 Lund, Sweden

c Niels Bohr Institute, University of Copenhagen, Denmark

d Paul Scherrer Institute, CH-5232 PSI Villigen, Switzerland

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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Article information

DOI
https://doi.org/10.1039/C2SM27101J
Article type
Paper
Submitted
11 Sep 2012
Accepted
08 Nov 2012
First published
22 Nov 2012

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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