Fig. 4From: Enhanced Biocompatibility in Anodic TaO x Nanotube Arrays a–j Optical images showing water and culture medium droplets on the a,f Ta foil surface and self-organized TaOx nanotubes with diameters of b,g 20, c,h 35, d,i 65, and e,j 90 nm, respectively. Contact angles are denoted in the imagesBack to article page