Inspired by grass stem design, scientists create nanostrut-connected tube-in-tubes that enable stronger low-density structural materials
https://www.llnl.gov/news/tube-tube-structure-going-strong
"Porous materials... with ultra-light weight and large surface area for wide-ranging applications, have recently achieved near-ideal linear scaling between stiffness and density... process to transform fully dense, 3D-printed polymeric beams into graphitic carbon hollow tube-in-tube sandwich structures, where... the inner and outer tubes are connected through a network of struts... applications... mechanical shock absorbers, thermal and acoustic insulation, flexible battery and catalyst scaffolds"
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