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. 2016 Sep 9;6(9):168. doi: 10.3390/nano6090168

Figure 2.

Figure 2

Optical micrographs of PDMS surface treated with UV (30 J·cm−2): top area: including untreated soft islands (distance of 45 µm), bottom area: homogeneously-hardened; micrographs taken after application of strain (direction shown in c) of 0% (a); 15% (b); and 20% (c).