  The present review gives an overview of the highlights of more than 10 years
of research on synthesis and applications of ordered oxide structures (nanotube
layers, hexagonal pore arrangements) that are formed by self-organizing
anodization of metals. In particular we address the questions after the
critical factors that lead to the spectacular self-ordering during the growth
of anodic oxides that finally yield morphologies such as highly ordered TiO2
nanotube arrays and similar structures. Why are tubes and pores formed - what
are the key parameters controlling these processes?
