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Brittle fracture to recoverable plasticity: polytypism-dependent nanomechanics in todorokite-like nanobelts

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Abstract

Atomic force microscopy (AFM) based nanomechanics experiments involving polytypic todorokite-like manganese dioxide nanobelts reveal varied nanomechanical performance regimes such as brittle fracture, near-brittle fracture, and plastic recovery within the same material system. These nanobelts are synthesized through a layer-to-tunnel material transformation pathway and contain one-dimensional tunnels, which run along their longitudinal axis and are enveloped by m × 3 MnO6 octahedral units along their walls. Depending on the extent of material transformation towards a tunneled microstructure, the nanobelts exhibit stacking disorders or polytypism where the value for m ranges from 3 to up to ∼20 within different cross-sectional regions of the same nanobelt. The observation of multiple nanomechanical performance regimes within a single material system is attributed to a combination of two factors: (a) the extent of stacking disorder or polytypism within the nanobelts, and (b) the loading (or strain) rate of the AFM nanomechanics experiment. Controllable engineering of recoverable plasticity is a particularly beneficial attribute for advancing the mechanical stability of these ceramic materials, which hold promise for insertion in multiple next-generation technological applications that range from electrical energy storage solutions to catalysis.

Graphical abstract: Brittle fracture to recoverable plasticity: polytypism-dependent nanomechanics in todorokite-like nanobelts

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Publication details

The article was received on 10 Jul 2018, accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8NA00079D
Citation: Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Brittle fracture to recoverable plasticity: polytypism-dependent nanomechanics in todorokite-like nanobelts

    M. R. Amin Shikder, M. Maksud, G. Vasudevamurthy, Bryan W. Byles, D. A. Cullen, K. L. More, E. Pomerantseva and A. Subramanian, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C8NA00079D

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