Extended Data Fig. 5: Effect of dimension variation of hexagon structural devices on forward threshold.

a-d, SEM images of hexagon device structures with different chamber sizes, the inner side lengths of the regular hexagon holes are 20 μm, 40 µm, 70 µm, and 560 µm, respectively. The insets in a and b are the partial enlargements of the corresponding SEM image. All the structures have the same hole depth of 500 μm. The multi-honeycomb structures have a wall thickness of 10 μm, while the single honeycomb structure has a thicker wall of 50 μm. The number of holes of regular hexagon structural devices are 547, 169, 61 and 1, respectively. e, Forward threshold pressure varies with hexagon devices with different hexagon hole sizes. These devices were treated with surface I. The forward threshold is determined by the capillary pressure and the entrapped air pressure at the point where the contact line starts to move. The data are represented as mean values ± s.d. (3 devices) with the corresponding data points overlapped.