Fig. 1
Design and hierarchical architecture of synergistic bCAs. a Schematic illustration of the hierarchical synergistic assembly for fabrication of stretchable bCAs through 3D printing (I) followed by freeze-drying (II) and pre-buckled reduction (III). b A digital photograph of ultralight bCAs with density of 5.7 mg cm−3 floating on a flower. c–f SEM images of quaternary structure of bCAs across multi-size scales. g–i Printed lattices by design with negative (−0.3, g), positive (+0.5, h), and nearly zero Poisson ratio (i). Scale bars, 5 mm (b), 500 μm (c), 100 μm (d), and 5 μm (e)
