Capillary flow behavior of worm-like micelles studied by small-angle X-ray scattering and small angle light scattering
Castelletto, V. and Hamley, I.W. (2006) Capillary flow behavior of worm-like micelles studied by small-angle X-ray scattering and small angle light scattering. Polymers for Advanced Technologies, 17 (3). pp. 137-144. ISSN 1042-7147
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To link to this article DOI: 10.1002/pat.712
A novel capillary flow device has been developed and applied to study the orientation of worm-like micelles, among other systems. Small-angle X-ray scattering (SAXS) data from micelles formed by a Pluronic block copolymer in aqueous salt solution provides evidence for the formation of worm-like micelles, which align under flow. A transition from a rod-like form factor to a less persistent conformation is observed under flow. Flow alignment of worm-like micelles formed by the low molar mass amphiphile system cetyl pyridinium chloride+sodium salicylate is studied for comparative purposes. Here, inhomogenous flow at the micron scale is revealed by streaks in the small-angle light scattering pattern perpendicular to the flow direction. Copyright (c) 2006 John Wiley & Sons, Ltd.