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. Author manuscript; available in PMC: 2017 Mar 30.
Published in final edited form as: Ann Biomed Eng. 2015 Jun 12;43(12):2978–2990. doi: 10.1007/s10439-015-1353-0

FIGURE 2.

FIGURE 2

SEM images of silicon needle and PVP-C1 microneedles with different C1 content, 1, 2, 4, 8% C1/PVP (w/w). The cracking was likely caused by the coating process performed in the vacuum sputter coater before SEM images were taken.