Fig. 2.

(A) Stress–strain curves of PG hydrogels containing different amounts of gelatin. (B) Stress–strain curves of PG hydrogels with varying levels of acrylamide. (C) Water contact angle data of PG hydrogel. (D) SEM of the patterned PG hydrogels with different stripe-to-spacing ratios (5/20, 10/20, 15/20, and 20/20). (E) Water contact angle diagram of PG hydrogels. (F) Images of produced patterned hydrogel and its magnified surface (10 μm). (G) Optical images and variation of pattern interval of hydrogels after immersion in PBS for 30 d. Scale bars, 50 μm.