Abstract
In this paper a study on the ion transmission ratio of a nanoporous aluminasample is presented. The sample was investigated by scanning transmission ionmicroscopy (STIM) with different beam sizes. The hexagonally close-packedAl2O3 nanocapillary array, realized as a suspended membrane of 15 µm thickness, had porediameters of ∼ 215 nmand spacing of ∼ 450 nm. When the proton beam size was limited to a single domain, a peaktransmission ratio of 19% was observed as is expected from the geometry (∼19–20%). This result points out an almost perfectly parallel alignment of the capillarieswithin one domain. However, for larger beam scanning areas (sampling multipledomains) the transmission ratio was reduced to 5%. The STIM analysis over an arealarger than the typical domain size revealed an overall capillary angular spread of ∼ 2°.
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