title: Nanoporous aluminum oxide membranes for filtration and biofunctionalization.
abstract: Nanoporous aluminum oxide membranes with high open porosity are prepared by anodic oxidation. Conventional self-supporting as well as mechanically stabilized nanoporous membranes are produced from aluminum plates and microimprinted aluminum foils, respectively. The mechanically stabilized membranes are characterized by very thin membrane parts stabilized by surrounding thick bridges. The minimal thickness of these thin membranes with open pores on both sides is 1 microm, with a mean pore size of the parallel open pores of 185 nm. With these two kinds of membrane the flow rates for cross filtration can be tuned over a wide range. With the mechanically stabilized membranes, substantially higher flow rates are achieved and experiments that cannot be performed with thicker membranes become possible. The biofunctionalization of the pore walls with archaebacterial tetraether lipids is realized and proved using aminated semiconductor nanocrystals. The lipid layer deposited on the pore walls also changes the filtration properties.
authors.affiliation: Fraunhofer Institute for Mechanics of Materials, Heideallee 19, 06120 Halle, Germany.
authors.forename: Annika
authors.initials: A
authors.lastname: Thormann
authors.forename: Nico
authors.initials: N
authors.lastname: Teuscher
authors.forename: Monika
authors.initials: M
authors.lastname: Pfannmöller
authors.forename: Ulrich
authors.initials: U
authors.lastname: Rothe
authors.forename: Andreas
authors.initials: A
authors.lastname: Heilmann
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D005374:Filtration; D008055:Lipids; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D016062:Porosity
chemical_list: D008055:Lipids; D008567:Membranes, Artificial; D000537:Aluminum Oxide