An international team of researchers has managed to mimic the colour of the Cyphochilus beetle scales – one of the brightest whites in nature, thanks to the ESRF’s imaging capabilities. This could help the development of ultra-white, sustainable paints.
Cyphochilus beetle scales are one of the brightest whites in nature. Until now, researchers did not known how their ultra-white appearance is created. X-ray nanotomography experiments at the ESRF have shown that the nanostructure in their tiny scales creates the colour, not the use of pigment or dyes.
Andrew Parnell, from the University of Sheffield and corresponding author of the study said: “In the natural world, whiteness is usually created by a foamy Swiss cheese-like structure made of a solid interconnected network and air. Until now, how these structures form and develop and how they have evolved light-scattering properties has remained a mystery.”
The findings show that the foamy structure of the beetles’ scales has the right proportion of empty spaces, in a highly interconnected nano-network, which optimise the scattering of light – creating the ultra-white colouring.
Image: Andrew Denison and Stephanie Burg in the experimental hutch of beamline ID16B.