Fig. 4: Bone-like nodules formation.

a SEM photographs of PDA/PCL fibrous membranes acquired after soaking in SBF for 7 and 14 days. b EDS data and Ca/P ratios of the particle sediments on the surface of PDA/PCL fibrous membranes at 14 days

a SEM photographs of PDA/PCL fibrous membranes acquired after soaking in SBF for 7 and 14 days. b EDS data and Ca/P ratios of the particle sediments on the surface of PDA/PCL fibrous membranes at 14 days