Fig. 2.

Interfacial stability between different SF substrates and adsorbed FN. a SEM images of different SF substrates after being immersed in PBS for 24 h, with and without ultrasonic treatment (UT). b, c Remaining mass (b) and β-sheet contents (c) of different SF substrates immersed in PBS with UT treatment at specific time points. d, e Immunofluorescence images (d) and the quantitative analysis (e) of adsorbed FN on different SF substrates after being immersed in FN solution for 24 h, with and without UT treatment. Error bars represent one standard deviation. (*P < 0.05 and **P < 0.01)