Directional Roll-up of Nanomembranes Mediated by Wrinkling

P. Cendula; S. Kiravittaya; I. Mönch; J. Schumann; O. G. Schmidt

doi:10.1021/nl103623e

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arXiv · 1009.5867

Directional Roll-up of Nanomembranes Mediated by Wrinkling

P. Cendula·S. Kiravittaya·I. Mönch·J. Schumann·O. G. Schmidt

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Abstract

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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P. Cendula, S. Kiravittaya, I. Mönch, J. Schumann, O. G. Schmidt. 2010-09-29. Directional Roll-up of Nanomembranes Mediated by Wrinkling. https://doi.org/10.1021/nl103623e

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