Issue 10, 2011
From the journal:

Soft Matter

Planar lamellae and onions: a spatially resolved rheo–NMR approach to the shear-induced structural transformations in a surfactant model system

Bruno Medronho,ac   Jennifer Brown,be   Maria Graça Miguel,a   Claudia Schmidt,d   Ulf Olssonc  and  Petrik Galvosas*e  

* Corresponding authors

a Department of Chemistry, University of Coimbra, Coimbra, Portugal

b Chemical and Biological Engineering, Montana State University, 306 Cobleigh Hall, PO Box 173920, Bozeman, MT, USA

c Physical Chemistry 1, Center of Chemistry and Chemical Engineering, Lund University, Box 124, Lund, Sweden

d Department of Chemistry, University of Paderborn, Warburger Str. 100, Paderborn, Germany

e MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand
E-mail: petrik.galvosas@vuw.ac.nz

Abstract

The shear-induced transformations between oriented planar lamellae and a state of closely packed multilamellar vesicles (MLVs) in a lyotropic nonionic surfactant model system were studied by the combination of nuclear magnetic resonance (NMR) spectroscopy and diffusometry with magnetic resonance imaging (MRI). 2H NMR imaging confirmed the discontinuous nature of the transition from onions to planar lamellae, revealing the spatial coexistence of both states within the gap of the cylindrical Couette geometry. On the other hand, NMR diffusion measurements in three principal directions and at various values of strain strongly suggest that a multi-lamellar cylindrical or undulated intermediate structure exists during the continuous and spatially homogeneous transition from planar lamellae to MLVs

Graphical abstract: Planar lamellae and onions: a spatially resolved rheo–NMR approach to the shear-induced structural transformations in a surfactant model system

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Article information

DOI
https://doi.org/10.1039/C0SM01323D
Article type
Paper
Submitted
16 Nov 2010
Accepted
07 Mar 2011
First published
06 Apr 2011

Soft Matter, 2011,7, 4938-4947

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Planar lamellae and onions: a spatially resolved rheo–NMR approach to the shear-induced structural transformations in a surfactant model system

B. Medronho, J. Brown, M. G. Miguel, C. Schmidt, U. Olsson and P. Galvosas, Soft Matter, 2011, 7, 4938 DOI: 10.1039/C0SM01323D

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