Figure 4. Quantitative evaluation of surficial
hydrophobicity/hydrophilicity. (A) Process of surficial modification,
top: the process of obtaining complex surface, bottom: the process of
obtaining standard curve. Concentration of HBT-DPI in DCM
solution: 1mM. (B) Complex surface modified by coving a mask, left: the
mask, right: complex surface after stained by HBT-DPI . (C) The
standard curve between fluorescent ratio and contact angle upon the PVDF
membrane. (D) The comparison of hydrophobicity between various
large-scale surfaces.