Ionically interacting nanoclay and nanofibrillated cellulose lead to tough bulk nanocomposites in compression by forced self-assembly
| Autor: | Anyuan Cao, Enzheng Shi, Mikael Ankerfors, Robin H. A. Ras, Jani Seitsonen, Hua Jin, Lars Berglund, Olli Ikkala, Luhui Zhang, Andreas Walther |
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| Rok vydání: | 2013 |
| Předmět: |
Toughness
Solid-state chemistry Materials science ta221 Composite number Biomedical Engineering 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound clay composite medicine General Materials Science Composite material ta218 ta214 Nanocomposite ta114 Stiffness General Chemistry General Medicine 021001 nanoscience & nanotechnology Compression (physics) 0104 chemical sciences Compressive strength Montmorillonite chemistry medicine.symptom 0210 nano-technology |
| Zdroj: | J. Mater. Chem. B |
| ISSN: | 2050-7518 2050-750X |
| DOI: | 10.1039/c2tb00370h |
| Popis: | Several approaches have recently been shown for self-assembled biomimetic composite films, aiming at combinations of high toughness, strength, and stiffness. However, it remains challenging to achieve high toughness using simple processes especially for bulk materials. We demonstrate that ionically interacting cationic native nanofibrillated cellulose (C-NFC) and anionic nanoclay, i.e. montmorillonite (MTM), allow local self-assemblies by a simple centrifugation process to achieve 3D bulk materials. The composite with MTM/C-NFC of 63/37 w/w has a high compressive strain to failure of 37% with distinct plastic deformation behaviour, a high work to fracture of 23.1 MJ m−3, and a relatively high compression strength of 76 MPa. Unlike the conventionally used sequential deposition methods to achieve well-defined layers for the oppositely charged units as limited to films, the present one-step method allows quick formation of bulk materials and leads to local self-assemblies, however, having a considerable amount of nanovoids and defects between them. We suggest that the nanovoids and defects promote the plastic deformation and toughness. Considering the simple preparation method and bio-based origin of NFC, we expect that the present tough bulk nanocomposites in compression have potential in applications for sustainable and environmentally friendly materials in construction and transportation. |
| Databáze: | OpenAIRE |
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