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Jang, Ji-Hyun
Nano Crystal Lab (NCL)
Research Interests
  • Graphene, photoelectrochemical (PEC) H2 generation, ORR/OER, SERS,3D-Nanostructures, supercapacitors, thermoelectric materials

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Combining Pattern Instability and Shape-Memory Hysteresis for Phononic Switching

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Title
Combining Pattern Instability and Shape-Memory Hysteresis for Phononic Switching
Author
Jang, Ji-HyunKoh, Cheong YangBertoldi, KatiaBoyce, Mary C.homas, Edwin L.
Keywords
Anticrossing; Bragg scattering; Elastic instabilities; Elastic recovery; Glass transition temperature; Nano scale; Narrow bands; Numerical simulation; Pattern symmetry; Reversible change; Shape-memory; Solvent swelling
Issue Date
2009-05
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.9, no.5, pp.2113 - 2119
Abstract
We report a fully reversible and robust shape-memory effect in a two-dimensional nanoscale periodic structure composed of three steps, the elastic instability governing the transformation, the plasticity that locks in the transformed pattern as a result of an increase in glass transition temperature (T g), and the subsequent elastic recovery due to the vapor-induced decrease in T g. Solvent swelling of a cross-linked epoxy/air cylinder structure induces an elastic instability that causes a reversible change in the shape of the void regions from circular to oval. The pattern symmetry changes from symmorphic p6mm to nonsymmorphic p2gg brought via the introduction of new glide symmetry elements and leads to a significant change in the phononic band structure, specifically in the opening of a new narrow-band gap due to anticrossing of bands, quite distinct from gaps originating from typical Bragg scattering. We also demonstrate that numerical simulations correctly capture the three steps of the shape-memory cycle observed experimentally.
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DOI
10.1021/nl9006112
ISSN
1530-6984
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ECHE_Journal Papers
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