Kirigami Engineering—Nanoscale Structures Exhibiting a Range of Controllable 3D Configurations

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• Dr Lior Medina (Department of Engineering, University of Cambridge)
• Sunday 14 March 2021, 10:40-11:05
• Online.

If you have a question about this talk, please contact Miroslava Novoveska.

Annual TCSS Symposium 2021

YouTube link: https://youtu.be/cfcSFJg4ANc

Registration form to attend Q&A session on Zoom: https://forms.gle/tTRQreym7s6pR2rW6

Kirigami structures provide a promising approach to transform flat films into 3D complex structures that are difficult to achieve by conventional fabrication approaches. By designing the cutting geometry, it is shown that distinct buckling-induced out-of-plane configurations can be obtained, separated by a sharp transition characterised by a critical geometric dimension of the structures. In situ electron microscopy experiments reveal the effect of the ratio between the in-plane cut size and film thickness on out-of-plane configurations. Moreover, geometrically nonlinear finite element analyses (FEA) accurately predict the out-of-plane modes measured experimentally, their transition as a function of cut geometry, and provide the stress–strain response of the kirigami structures. The combined computational–experimental approach and results reported here represent a step forward in the characterisation of thin films experiencing buckling-induced out-of-plane shape transformations and provide a path to control 3D configurations of micro- and nanoscale buckling-induced kirigami structures. The out-of-plane configurations promise great utility in the creation of micro- and nanoscale systems that can harness such structural behaviour, from optical scanning micromirrors, to novel actuators, and nanorobotics.

This talk is part of the Trinity College Science Society (TCSS) series.

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