Issue 48, 2015

Dynamic orientation transition of the lyotropic lamellar phase at high shear rates

Abstract

The dynamic orientation behavior of the lamellar phase of a triblock copolymer is studied in a wide range of shear rates as a function of solvent composition. We find that various phases can be induced by increasing the shear rate. At low shear rates, the onion phase forms from planar lamellae with many defects. A further increase of the shear rate caused the onion structure to break down, and the lamellar phase recovers with fewer defects. Finally, the transition of the orientation from parallel to perpendicular is observed at high shear rates. In the orientation transition at high shear rates, a stable intermediate structure, to our knowledge, is found for the first time. We also find that the critical shear stress of the rupture of the onion phase coincides with the orientation transition. The consistency of the critical shear stress suggests that all orientation transitions at a high shear rate are dominated by a mechanical balance between the applied viscous stress and the internal relaxation mode of the lamellae.

Graphical abstract: Dynamic orientation transition of the lyotropic lamellar phase at high shear rates

Supplementary files

Article information

Article type
Paper
Submitted
17 Jul 2015
Accepted
25 Sep 2015
First published
02 Oct 2015

Soft Matter, 2015,11, 9330-9341

Author version available

Dynamic orientation transition of the lyotropic lamellar phase at high shear rates

S. Fujii and Y. Yamamoto, Soft Matter, 2015, 11, 9330 DOI: 10.1039/C5SM01755F

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