Fig. 1: Concept and preparation of hybrid crystalline spirals.
From: Logarithmic and Archimedean organic crystalline spirals
a Schematic illustration of the mechanism used by butterflies to feed from flowers in nature using their proboscis. b Chemical structures of the elastic crystals 1–3. c Photos of the hybrid crystals P4//1–3 curling at low humidity (RH = 11.7%). The images were taken under UV light for enhanced contrast against the background. The upper and lower figures show the front and side views, respectively. d Diagram showing the method used to calculate the angle of a curled hybrid crystal. e, f Dependence of the degree of curling of two P4//2 hybrid crystals on the number of PVA/PSS layers. Scale bars, 400 μm.
