Fig. 4. The change of (a) frequency and (b) phase angle at the phase angle vs. frequency minimum as a function of potential for fBLM-AβO in the PBS (0.01 M phosphate buffer, 0.0027 M KCl and 0.137 M NaCl, pH = 7.4) solution. The upper abscissa plots the transmembrane potential that accounts for the potential of zero free charge (Epzfc = 0.11 V vs. Ag/AgCl).
