Patent ID: 9376538
Filing Date: 2016-06-28
CPC Classification: B01D,C08J,H01M,Y02E,Y02P

Claim Text:
1. A method for the production of a nanoporous polymeric membrane, comprising positioning an opaque layer of material entirely opaque to ions over a polymer film and depositing an aluminum layer over said opaque layer, transforming said aluminum layer into anodic porous alumina by an anodisation method, the transforming forming a barrier layer inside and at a bottom of pores of the anodic porous alumina; eliminating the barrier layer through chemical etching, in such a manner to define channels passing through the layer of anodic porous alumina; chemically etching the opaque layer through the pores of the anodic porous alumina in such a manner to obtain in said opaque layer an ordered honeycomb arrangement of mask nanopores corresponding to the arrangement of the pores of the anodic porous alumina and thus forming an amplitude mask in the opaque layer; removing the anodic porous alumina; interposing the amplitude mask between a source of heavy ions and a polymer film, in proximity to the film, the amplitude mask having the ordered honeycomb arrangement of mask nanopores and thickness sufficient to prevent the passage of the heavy ions that are not directed through the mask nanopores of the amplitude mask; bombing the polymer film by a high energy focused heavy ion beam through the amplitude mask having the ordered honeycomb arrangement of mask nanopores, so that a corresponding ordered honeycomb distribution of polymer nanopores is obtained in said polymer film; performing a chemical etching of the film after the bombing to remove the portions of said film in zones degraded by the ion bombing in such a manner to obtain pores passing through the film; and said polymer nanopores obtained in the polymer film having an aspect-ratio at least exceeding 10.