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Issue 35, 2013

Shear-induced macroscopic “Siamese” twins in soft colloidal crystals

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Abstract

Soft colloidal crystals are inherently highly susceptible to shear. We find by using scanning rheo-SANS and scanning synchrotron-rheo-SAXS experiments that high shear strains cause macroscopic “Siamese” twinning in lyotropic FCC-crystals formed by block copolymer micelles or polymer-coated nanoparticles. The twins extend over the whole gap of the shear cell with one twin always located in the outer region of the gap, and the other twin always located in the inner region of the gap. We could visualize twin boundary surfaces by using transmission electron microscopy. In analogy to the plastic deformation of nanocrystalline metals under high shear stress and high deformation rates we propose a deformation twining mechanism for the formation of such macroscopic twins.

Graphical abstract: Shear-induced macroscopic “Siamese” twins in soft colloidal crystals

Supplementary files

Article information


Submitted
19 Apr 2013
Accepted
03 Jul 2013
First published
04 Jul 2013

Soft Matter, 2013,9, 8464-8475
Article type
Paper

Shear-induced macroscopic “Siamese” twins in soft colloidal crystals

S. M. Taheri, S. Rosenfeldt, S. Fischer, P. Bösecke, T. Narayanan, P. Lindner and S. Förster, Soft Matter, 2013, 9, 8464 DOI: 10.1039/C3SM51075A

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