Nanoporöse Filter- oder Trägermembran sowie Verfahren zur Herstellung

The invention relates to a nanoporous filter or support membrane (5) and method for production thereof, whereby a porous layer with pores (4) of given diameter and given pore depth are formed by anodic oxidation of a metallic starting substrate, or a metallic starting film (1), optionally removed from the remaining starting substrate with subsequent opening of the pores (4) to both sides in order to give the nanoporous membrane (5). The method is characterised in that, before the anodic oxidation, at least one surface of the starting substrate, or the starting film (1) and/or after the anodic oxidation, at least one surface of the membrane is structured by the production of recesses (2), the lateral dimensions of which exceed those of the pores by multiple factors.