Directional Roll-up of Nanomembranes Mediated by Wrinkling

Details Directional Roll-up of Nanomembranes Mediated by Wrinkling Directional Roll-up of Nanomembranes Mediated by Wrinkling

2010-09-29

arxiv.org/abs/1009.5867v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1021/nl103623e

We investigate the relaxation of rectangular wrinkled thin films intrinsically containing an initial strain gradient. A preferential rolling direction, depending on wrinkle geometry and strain gradient, is theoretically predicted and experimentally verified. In contrast to typical rolled-up nanomembranes, which bend perpendicular to the longer edge of rectangular patterns, we find a regime where rolling parallel to the long edge of the wrinkled film is favorable. A non-uniform radius of the rolled-up film is well reproduced by elasticity theory and simulations of the film relaxation using a finite element method.

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