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Wet‐Spun Superelastic Graphene Aerogel Millispheres with Group Effect
Author(s) -
Zhao Xiaoli,
Yao Weiquan,
Gao Weiwei,
Chen Hao,
Gao Chao
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201701482
Subject(s) - materials science , graphene , aerogel , pseudoelasticity , composite material , oxide , nanotechnology , compressive strength , annealing (glass) , microstructure , metallurgy , martensite
Graphene aerogel has attracted great attention due to its unique properties, such as ultralow density, superelasticity, and high specific surface area. It shows huge potential in energy devices, high‐performance pressure sensors, contaminates adsorbents, and electromagnetic wave absorbing materials. However, there still remain some challenges to further promote the development and real application of graphene aerogel including cost‐effective scalable fabrication and miniaturization with group effect. This study shows millimeter‐scale superelastic graphene aerogel spheres (GSs) with group effect and multifunctionality. The GSs are continuously fabricated on a large scale by wet spinning of graphene oxide liquid crystals followed by facile drying and thermal annealing. Such GS has an unusual core–shell structure with excellent elasticity and specific strength. Significantly, both horizontally and vertically grouped spheres exhibit superelasticity comparable to individual spheres, enabling it to fully recover at 95% strain, and even after 1000 compressive cycles at 70% strain, paving the way to wide applications such as pressure‐elastic and adsorbing materials. The GS shows a press‐fly behavior with an extremely high jump velocity up to 1.2 m s −1 . For the first time, both free and oil‐adsorbed GSs are remotely manipulated on water by electrostatic charge due to their ultralow density and hydrophobic properties.