Figure 1: Characterization of PIII Treatment on PCL Control Surfaces

(A) Plasma immersion ion implantation (PIII) schematic with representative images of control surfaces before (top) and after (bottom) treatment. (B) Attenuated total reflectance Fourier-transform infrared spectroscopy (ATR FT-IR) surface characterization. (C) Electron paramagnetic resonance (EPR) characterization. (D) Diagram of experimental groups. (E) Interleukin-4 (IL-4) retention enzyme-linked immunoadsorbent assay (n = 3 per group). PCL = polycaprolactone; RT = room temperature; SDS = sodium dodecyl sulfate.