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Mechanical durability using the crockmeter test of nanostructured PI on the glass (FS) substrate (sample similar to that of Figure 2). Comparison between before (a) and after (b) more than 500 passes performed with standard 9 N force over 2 cm2 contact area using the standard microfiber crockmeter cloth. Optical comparison of bare FS and nanostructured PI on the FS substrate before and after the crockmeter test (c).
