Hierarchical toughening of bioinspired nacre-like hybrid carbon composite
| Autor: | Qingxin Zhang, Jian Zhang, Zengqian Liu, S.F. Tang, Da Jiao, Zhefeng Zhang, Yang Liu, X.G. Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Carbonization Composite number chemistry.chemical_element Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Fracture toughness Amorphous carbon chemistry Nano General Materials Science Graphite 0210 nano-technology Carbon Damage tolerance |
| Zdroj: | Carbon. 171:409-416 |
| ISSN: | 0008-6223 |
| Popis: | Replicating the architecture of natural nacre has become an important approach for enhancing the damage tolerance of man-made materials. Nevertheless, this is principally limited to systems composed of chemically different constituents and demonstrates a difficulty in realizing structural hierarchy at multiple length-scales. Here a proof of concept is presented about the implementation of bioinspired nacre-like designs in a hybrid composite of pure carbon comprising its two basic allotropic forms, i.e., natural graphite flakes and amorphous carbon from the carbonization of organics. Multiscale micro/nano-architectures with three levels of hierarchy were constructed in the composite based on the preferential alignment of graphite flakes using bidirectional freeze casting method. The composite exhibited a remarkable mechanical efficiency, specifically featured by good damage tolerance with rising R-curve behavior, owing to the activation of hierarchical toughening mechanisms at micro to nano length-scales. This verifies the potency of nacre-inspired designs for generating enhanced fracture toughness in carbon systems, even using simple raw materials, which is significant for promoting their structural applications. |
| Databáze: | OpenAIRE |
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