Multi-walled carbon nanotube–Al2O3 composites: Covalent or non-covalent functionalization for mechanical reinforcement

Abstract : Multi-walled carbon nanotube–Al2O3 composites are prepared using carbon nanotubes (8 walls, 1.5 lm long or 20 walls, 10 lm long) previously submitted to either covalent or non-covalent functionalization. High-energy sonication mixing, freeze-drying and spark plasma sintering lead to dense composites. The shorter CNTs are better dispersed than the longer ones, whatever the functionalization. Crack-bridging by CNTs is evidenced only when non-covalent functionalization is used and is correlated with a high fracture toughness for composites with the longer CNTs.
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Anne Kasperski, Alicia Weibel, Claude Estournès, Christophe Laurent, Alain Peigney. Multi-walled carbon nanotube–Al2O3 composites: Covalent or non-covalent functionalization for mechanical reinforcement. Scripta Materialia, Elsevier, 2014, vol. 75, pp; 46-49. ⟨10.1016/j.scriptamat.2013.11.015⟩. ⟨hal-01130694⟩

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