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One-Step Nanoscale Assembly of Complex Structures via Harnessing of an Elastic Instability
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, Randall D. Kamien*†§ and Shu Yang*†‡ Laboratory for Research on the Structure of Matter, University of Pennsylvania.
, ‡Department of Materials Science and Engineering, University of Pennsylvania.
, §Department of Physics and Astronomy, University of Pennsylvania.
, Present address: Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan.
Abstract
We report on a simple yet robust method to produce orientationally modulated two-dimensional patterns with sub-100 nm features over cm2 regions via a solvent-induced swelling instability of an elastomeric film with micrometer-scale perforations. The dramatic reduction of feature size (
10 times) is achieved in a single step, and the process is reversible and repeatable without the requirement of delicate surface preparation or chemistry. By suspending ferrous and other functional nanoparticles in the solvent, we have faithfully printed the emergent patterns onto flat and curved substrates. We model this elastic instability in terms of elastically interacting “dislocation dipoles” and find complete agreement between the theoretical ground-state and the observed pattern. Our understanding allows us to manipulate the structural details of the membrane to tailor the elastic distortions and generate a variety of nanostructures.
Citing Articles
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This article has been cited by 5 ACS Journal articles (5 most recent appear below).
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History
- Published In Issue April 09, 2008
- Article ASAPMarch 12, 2008
- Received: January 16, 2008
Revised: February 18, 2008
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