Chemistry and Structure of Birch Bark Support Passive Radiative Cooling
Raffaele Perrotta, Mingna Liao, Pengli Li, Monica Ek, Florian Schott, Stephen A. Hall, Magnus P. Jonsson, Anna Lintunen, Mikael Stefan Hedenqvist, Ravi Shanker, Anna Justina Svagan
The paper shows that birch bark and betulin exhibit passive radiative cooling by reflecting solar radiation and emitting mid-infrared heat.
bioRxiv · Aug 28, 2026 · PreprintPlant Biology