Fig. 5: Opacity, angle dependency and practical applications of superblack wood.
From: Wood-based superblack
a Total transmittance of cDW through the longitudinal direction (tree-growth direction) with thicknesses of ~3 and 7 mm. b Specular reflectance of cDW using illumination from 0 to 65° with respect to the normal direction. c, d Directional reflection properties of cDW using normal illumination and observation at 90° (i), 45° (ii) and near-edge ~0° (iii). e Film of carbon nanoparticles with diameter of (i) 900 nm (3% reflection)50, (ii) 200 nm (4% reflection)50, and (iii) Superblack wood photographed under intense light illumination (~10,000 lx) in high dynamic range (HDR). f Low light scattering from superblack wood under laser (power of 100 and 1 mW). g Photographs of superblack wood with bare finger contact and immersed in water.
