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(a) Effects of electrospinning process and concentration of polymer solutions used during electrospinning on structure of PCL. XRD pattern of PCL film and electrospun nanofibrous mesh, focusing on 2θ from 16° to 25°. Inset: XRD pattern of PCL film and fibres over a wider 2θ range; and (b) XRD pattern of nanofibres composed of 10 wt% PCL with retinoic acid encapsulation. Inset: XRD pattern of PCLEEP samples, H2O140 (blue) and RA20 (red).
