Nanomechanics of individual aerographite tetrapods

Raimonds Meija, Stefano Signetti, Arnim Schuchardt, Kerstin Meurisch, Daria Smazna, Matthias Mecklenburg, Karl Schulte, Donats Erts, Oleg Lupan, Bodo Fiedler, Yogendra Kumar Mishra (), Rainer Adelung () and Nicola M. Pugno ()
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Raimonds Meija: Institute of Chemical Physics, University of Latvia
Stefano Signetti: Laboratory of Bio-Inspired & Graphene Nanomechanics, Environmental and Mechanical Engineering, University of Trento
Arnim Schuchardt: Functional Nanomaterials, Institute for Materials Science, Kiel University
Kerstin Meurisch: Functional Nanomaterials, Institute for Materials Science, Kiel University
Daria Smazna: Functional Nanomaterials, Institute for Materials Science, Kiel University
Matthias Mecklenburg: Institute for Polymers and Composites, Hamburg University of Technology
Karl Schulte: Institute for Polymers and Composites, Hamburg University of Technology
Donats Erts: Institute of Chemical Physics, University of Latvia
Oleg Lupan: Functional Nanomaterials, Institute for Materials Science, Kiel University
Bodo Fiedler: Institute for Polymers and Composites, Hamburg University of Technology
Yogendra Kumar Mishra: Functional Nanomaterials, Institute for Materials Science, Kiel University
Rainer Adelung: Functional Nanomaterials, Institute for Materials Science, Kiel University
Nicola M. Pugno: Laboratory of Bio-Inspired & Graphene Nanomechanics, Environmental and Mechanical Engineering, University of Trento

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Carbon-based three-dimensional aerographite networks, built from interconnected hollow tubular tetrapods of multilayer graphene, are ultra-lightweight materials recently discovered and ideal for advanced multifunctional applications. In order to predict the bulk mechanical behaviour of networks it is very important to understand the mechanics of their individual building blocks. Here we characterize the mechanical response of single aerographite tetrapods via in situ scanning electron and atomic force microscopy measurements. To understand the acquired results, which show that the overall behaviour of the tetrapod is governed by the buckling of the central joint, a mechanical nonlinear model was developed, introducing the concept of the buckling hinge. Finite element method simulations elucidate the governing buckling phenomena. The results are then generalized for tetrapods of different size-scales and shapes. These basic findings will permit better understanding of the mechanical response of the related networks and the design of similar aerogels based on graphene and other two-dimensional materials.

Date: 2017
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DOI: 10.1038/ncomms14982

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