Aerographene or graphene aerogel is, as of March 2013[update], the least dense solid known, at 160 g/m3 (0.0100 lb/cu ft), less than helium. It is approximately 7.5 times less dense than air. (The cited density does not include the weight of the air incorporated in the structure: it does not float in air). It was developed at Zhejiang University. Allegedly the material can be produced at the scale of cubic meters.
Aerographene contains carbon nanotube supports on the inside. These are surrounded by a graphene exterior. Aerographene is an elastic foam. Its density is such that blocks of it can be balanced on small plants and plant structures such as flowers and grasses.
Aerographene was discovered at Zhejiang University by a team of scientists led by Gao Chao. He and his team had already successfully created macroscopic materials made out of graphene. These materials were one-dimensional and two-dimensional. However, when synthesizing aerographene, the scientists instead created a three-dimensional structure. The synthesis was accomplished by the freeze-drying of carbon nanotube solutions and large amounts of graphene oxide. Residual oxygen was then removed chemically.
- Michelle Starr (March 25, 2013). "Graphene aerogel is the new world's lightest substance". Retrieved September 6, 2013.
- "Ultra-light Aerogel Produced at a Zhejiang University Lab-Press Releases-Zhejiang University". Zju.edu.cn. 2013-03-19. Archived from the original on 2013-05-23. Retrieved 2013-06-12.
- Mecklenburg, M.; Schuchardt, A.; Mishra, Y. K.; Kaps, S. R.; Adelung, R.; Lotnyk, A.; Kienle, L.; Schulte, K. (2012). "Aerographite: Ultra Lightweight, Flexible Nanowall, Carbon Microtube Material with Outstanding Mechanical Performance". Advanced Materials. 24 (26): 3486–3490. doi:10.1002/adma.201200491. PMID 22688858.
- "Solid carbon, springy and light". Nature. 494 (7438): 404. February 27, 2013. Bibcode:2013Natur.494Q.404.. doi:10.1038/494404a. PMID 23446383.
- Farrell, David (March 26, 2013). "Graphene sponge becomes lightest material on earth". vr-zone.com. Retrieved September 7, 2013.
- Chen, Bo, et al. "Carbon‐Based Sorbents with Three‐Dimensional Architectures for Water Remediation." Small 11.27 (2015): 3319-3336.