科研之友
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摘要
Aerographite is an ultralight porous material with a three-dimensional interconnected network structure consisting of hollow carbon fibers. The unique morphology is derived from using tetrapod-type zinc oxide (ZnO) as a template in fabrication process, demonstrating that aerographite's architecture can be designed through the choice of templates with the desired morphologies. Here we synthesized aero-graphite microparticles by utilizing the morphology of ZnO nanorods-microspheres as a template. The microparticles exhibited spiked-shell structures consisting of radially aligned hollow nanorods. Experimental results for single-particle-level compressive tests indicated excellent flexibility under large deformation for the microparticles, with elastic recovery after 73% compression. The structure-dependent large elastic limit is a unique characteristic that differentiates this material from other microparticles. Both normalized load-displacement curves and in situ observations suggested that two-step compressive mechanism occurred: local deformation at the contact region and whole-particle deformation. The Young's modulus of the aerographite particles is comparable to that of silicone rubber despite the density being <3% of silicone. The probability of cracking during the compression likely increased above 40% strain; however, even then, the particles almost recovered its spherical shapes after unloading. Repetitive tests also indicated less accumulation of residual strain for the particles annealed at higher temperature.
- 出版日期2017-7
