Figure 2
From: Replica-mold nanopatterned PHEMA hydrogel surfaces for ophthalmic applications
(a) Silicon mold with arrow-shaped marker and two 90 × 90 µm2 arrays, each consisting of 37,825 holes (scale bar 100 µm). (b,c) Detailed view of arrays of (b) small (30 kV, 42 pA) and (b) big (30 kV, 160 pA) holes (scale bars 1 µm). Images were acquired by SEM (5 kV, 160 pA).
