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Nanoporous Aluminum Oxide Membranes for Filtration and Biofunctionalization
Author(s) -
Thormann Annika,
Teuscher Nico,
Pfannmöller Monika,
Rothe Ulrich,
Heilmann Andreas
Publication year - 2007
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200600582
Subject(s) - membrane , nanoporous , materials science , filtration (mathematics) , chemical engineering , porosity , aluminium , oxide , nanotechnology , composite material , chemistry , metallurgy , biochemistry , statistics , mathematics , engineering
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 μm, 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.