Alternating Vorticity Bands in a Solution of Wormlike Micelles
Journal Article
·
· Physical Review Letters
- Institute of Food Science and Nutrition, ETH Zurich, 8092 Zurich (Switzerland)
- Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 PSI Villigen (Switzerland)
We report on structural characterization of vorticity bands formed in a wormlike micellar solution by Rheo-small-angle neutron scattering and video imaging experiments. Below a critical shear stress {tau}{sub c} in Newtonian and shear-thinning regime, only a minor flow alignment of the micelles is observed. Above {tau}{sub c}, in the shear-thickening regime, alternating transparent and turbid bands are formed. Triggered small-angle neutron scattering shows different anisotropic patterns in both bands indicating strongly aligned structures. By high-speed video imaging, we show that such an alignment of micelles does not correspond to a phase of lower viscosity.
- OSTI ID:
- 21024274
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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