Quasi-static compression properties of graphene aerogel

Graphene aerogel (GA) is a promising candidate for energy absorption purposes because of its very low density, high specific surface area and porous structure. GA samples, prepared by the Sol-Gel method, were tested under quasi-static compression, and characterized via surface area analyzer, as well...

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Bibliographic Details
Published in:Diamond and related materials 2021-01, Vol.111, p.108225, Article 108225
Main Authors: Niu, Lulu, Xie, Jing, Chen, Pengwan, Li, Guangyong, Zhang, Xuetong
Format: Article
Language:English
Subjects:
Aerogels
Axial compression
Compression tests
Compressive properties
Electron microscopy
Energy absorption
Graphene
Graphene aerogel
Mechanical properties
Microscopy
Microstructure evolution
Modulus of elasticity
Negative structural Poisson's ratio
Plastic foam
Poisson's ratio
Sol-gel processes
Surface area
Toughness
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Summary:Graphene aerogel (GA) is a promising candidate for energy absorption purposes because of its very low density, high specific surface area and porous structure. GA samples, prepared by the Sol-Gel method, were tested under quasi-static compression, and characterized via surface area analyzer, as well as scanning electron microscopy and transmission electron microscopy. The results show that 98% (and above) porous GA samples, whose elastic modulus is 2.9 MPa, can support at least 35,000 times its weight. Scaling analysis shows that the mechanical properties of GA are superior to those of conventional polymeric open-cell foams. The GA samples exhibit a negative structural Poisson's ratio under the uniaxial compression test, which is most likely due to the bread-like microstructural evolution. Due to the mesopores of the GA sample as well as the negative structural Poisson's ratio, the GA has considerable toughness. [Display omitted] •The produced Graphene Aerogel (GA) samples have a hierarchy-porous structure with a 98% porosity.•The mechanical properties of GA are superior to those of conventional polymeric open-cell foams by a scaling law analysis.•The negative structural Poisson’s ratio of GA samples is most likely due to the bread-like microstructural evolution.•Due to the mesopores and the negative structural Poisson’s ratio, the GA has considerable toughness.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2020.108225