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Scanning electron micrographs of highly ordered gold-coated porous alumina used as the substrate for pore-spanning DODAB and DOTAP bilayers. The average pore radius in A is (33 ± 2) nm with an overall porosity of (34 ± 6)%, whereas in B an average pore radius of (90 ± 5) nm and a porosity of (16 ± 5)% is found.
