Brittle fracture to recoverable plasticity: Polytypism-dependent nanomechanics in todorokite-like nanobelts
| Autor: | Arunkumar Subramanian, M. Maksud, Karren L. More, Ruhul Amin Shikder, David A. Cullen, Ekaterina Pomerantseva, Gokul Vasudevamurthy, Bryan W. Byles |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Engineering Stacking chemistry.chemical_element Bioengineering General Chemistry Manganese engineering.material Plasticity Microstructure Atomic and Molecular Physics and Optics Todorokite chemistry Octahedron engineering Fracture (geology) General Materials Science Composite material Nanomechanics Uncategorized |
| DOI: | 10.25417/uic.14910282.v1 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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