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SEM, FTIR, and AFM characterization of SF films. (a) SEM. Group S: SF films without micropatterns; Group G: SF film with micropatterns. The surface of SF film material was clear and stable. (b) FTIR. The β-sheet content in micropattern SF film after water annealing was significantly increased. (c) AFM. The nanoscale roughness on the surface of the micropattern SF film after water annealing treatment was significantly increased.
