[Retracted] Influence of P(VDF-TrFE) Membranes with Different Surface Potentials on the Activity and Angiogenic Function of Human Umbilical Vein Endothelial Cells

Figure 3

Physical characterization of differently poled P(VDF-TrFE) membrane. The KPFM images depict the distribution of relative surface potential for positively, negatively, and neutrally P(VDF-TrFE).