Biomimetic superelastic graphene-based cellular monoliths

Biomimetic superelastic graphene-based cellular monoliths

Received 23 Aug 2012 | Accepted 1 Nov 2012 | Published 4 Dec 2012 | Ling Qiu, Jeffery Z. Liu, Shery L.Y. Chang, Yanzhe Wu & Dan Li
The article presents a novel method to create ultralight and superelastic graphene-based cellular monoliths by mimicking the hierarchical structure of natural cork. The researchers used freeze casting, a cost-effective solution-phase materials shaping technique, to assemble graphene sheets into a cork-like structure. This method involves freezing an aqueous suspension of partially reduced graphene oxide (pr-GO) in a dry ice bath, followed by thawing, further reduction, freeze drying, and annealing. The resulting monoliths exhibit a honeycomb-like cellular structure with cell dimensions in the order of tens of micrometers and cell walls slightly corrugated. These materials demonstrate exceptional mechanical properties, including high resilience, superelasticity, good electrical conductivity, and high energy absorption capability. The unique hierarchical structure, characterized by well-organized multilayered cell walls and a honeycomb-like cell structure, allows the monoliths to maintain structural integrity under significant deformation and rapid recovery from compression. The study opens new avenues for the application of graphene in self-supporting, structurally adaptive, and 3D macroscopic forms.The article presents a novel method to create ultralight and superelastic graphene-based cellular monoliths by mimicking the hierarchical structure of natural cork. The researchers used freeze casting, a cost-effective solution-phase materials shaping technique, to assemble graphene sheets into a cork-like structure. This method involves freezing an aqueous suspension of partially reduced graphene oxide (pr-GO) in a dry ice bath, followed by thawing, further reduction, freeze drying, and annealing. The resulting monoliths exhibit a honeycomb-like cellular structure with cell dimensions in the order of tens of micrometers and cell walls slightly corrugated. These materials demonstrate exceptional mechanical properties, including high resilience, superelasticity, good electrical conductivity, and high energy absorption capability. The unique hierarchical structure, characterized by well-organized multilayered cell walls and a honeycomb-like cell structure, allows the monoliths to maintain structural integrity under significant deformation and rapid recovery from compression. The study opens new avenues for the application of graphene in self-supporting, structurally adaptive, and 3D macroscopic forms.
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