Fig. 2From: Surface functionalization of TiO2 nanotubes with minocycline and its in vitro biological effects on Schwann cellsThe wettability of TiO2 nanotubes prepared under different voltage. Contact angles as measured on a TiO2 nanotubes at 20 V, b TiO2 nanotubes at 30 V, c TiO2 nanotubes at 40 V, d TiO2 nanotubes at 50 V. e The contact angles for each group (mean ± SD, n = 6). Bars with dissimilar letters indicate significantly different values (p < 0.05)Back to article page