Fig. 2: Humidity sensing and cyclability of the hybrid crystalline spirals.
From: Logarithmic and Archimedean organic crystalline spirals
a Photographs of ten hybrids P4//2 of different sizes (P4//2a–P4//2j) that curl to a different degree at a constant humidity of RH = 11.3%. b Curling of P4//2 at different relative humidity (RH) levels at 25 oC. c Curling angle of P4//2, as defined in Fig. 1d, plotted as function of humidity (linear fit: y = – 29x + 2422°). d Cyclability of P4//2 over 75 cycles between two relative humidity points (RH = 66.1% and 22.5%). e Variation of the curling angle of P4//2 with the cycle number. Scale bars, 400 μm.
