Fig. 1

Simulated side view of micropillars on a PDMS substrate. The pillar produced by 30 h chemical etching was shown as an example to incorporate information on the height (15.4 μm) and base diameter (43.9 μm) of the pillar from Table 1. The red line outlined the profile at the base of the 14-h pillar and provided a reference for comparison with those of the 18- and 22-h pillars. The black line outlined the profile at the base of the 18-h pillar and provided a reference for comparison with those of the 22-, 26- and 30-h pillars