Fig. 2: Structural and mechanical properties of BBP–MX–AG.

a SEM image of BBP–MX–AG. HRTEM images showing nanochannels with an interlayer spacing of (b) 1.8 nm in the cellular wall of BBP–MX–AG and c 1.1 nm in the cellular wall of MX-AG. d XRD patterns of BBP–MX–AG and MX–AG. e Young’s modulus versus density of BBP–MX–AG. Inset: optical image showing a light monolithic sample sitting on top of a green bristlegrass. f Compressive stress–strain curves of BBP–MX–AG during compression-release cycles with maximum strains up to 80%.