Fig. 3: Optical observation and theoretical calculation of the directional flow.
From: Circadian humidity fluctuation induced capillary flow for sustainable mobile energy
a, b In situ microscope imaged polystyrene microspheres (diameter, ~18 μm) added to dry/wet IL drop exposed to air (RH, ~40%) to confirm the inward flow and outward flow. c Schematic illustration and calculation of how moisture absorption could cause inward flow along the bottom of IL drops. d Schematic showing the moisture absorption induced complete flow within the outline of the drop recorded by microscope imaging (Supplementary Fig. 3a, c).
