| Issue |
Europhys. Lett.
Volume 50, Number 6, June II 2000
|
|
|---|---|---|
| Page(s) | 803 - 809 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00552-9 | |
| Published online | 01 September 2002 | |
Is a birefringence band a shear band?
Institute of Fundamental Sciences-Physics, Massey University
Palmerston North, New Zealand
Received:
4
January
2000
Accepted:
20
April
2000
The discrepancy between the width of birefringence bands and
shear rate bands in the system CTAB/water is addressed using a combination
of NMR spectroscopy and NMR velocimetry. In correspondence with birefringence
measurements in the annular gap of a cylindrical Couette cell, 
NMR spectroscopy
indicates a separation of fluid into distinct nematic and isotropic phases.
By contrast the velocity profile exhibits an extremely narrow shear band,
consistent with the predictions of the lever rule. Contrary to previous
assumptions, the experimental evidence points to a nematic phase with high
viscosity.
PACS: 76.60.Pc – NMR imaging / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 83.10.Ji – Fluid dynamics (nonlinear fluids)
© EDP Sciences, 2000
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