Fig. 2

Structure of a TiO₂ nanotube array with about 10 μm TiO₂ nanotubes at the top and the bottom of the Ti-foil (left) and a schematic image of the tissue culture setup (right), where a retina explant (black) lies on top of nanotube array (grey) which is placed onto a stainless steel grid (black). Super-hydrophilicity ensures a thin medium film (blue) on top of the arrays and supplies the explant with needed nutrients