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. Author manuscript; available in PMC: 2022 Jan 4.
Published in final edited form as: ACS Appl Mater Interfaces. 2019 May 13;11(20):18233–18241. doi: 10.1021/acsami.9b04362

Figure 3.

Figure 3.

Nanoindentation of PEGDA hydrogels to measure surface elasticity. Force indentation curves of (a) patterned and (b) nonpatterned hydrogels. Blue lines indicate approach, red lines indicate retraction, and black lines represent the average profile. (c) Overlay of the average indentation curves shows minimal difference between patterned and nonpatterned hydrogels. (d) Average Young’s modulus determined from a Hertzian contact model for nonpatterned (N-P), patterned (P), and all regions (overall). n = 129 (66 patterned, and 63 nonpatterned).