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Optofluidic characterization of nanoporous membranes.

Authors
Type
Published Article
Journal
Langmuir
1520-5827
Publisher
American Chemical Society
Publication Date
Volume
29
Issue
8
Pages
2784–2789
Identifiers
DOI: 10.1021/la304869y
PMID: 23373556
Source
Medline
License
Unknown

Abstract

An optofluidic method that accurately identifies the internal geometry of nanochannel arrays is presented. It is based on the dynamics of capillary-driven fluid imbibition, which is followed by laser interferometry. Conical nanochannel arrays in anodized alumina are investigated, which present an asymmetry of the filling times measured from different sides of the membrane. It is demonstrated by theory and experiments that the capillary filling asymmetry only depends on the ratio H of the inlet to outlet pore radii and that the ratio of filling times vary closely as H(7/3). Besides, the capillary filling of conical channels exhibits striking results in comparison to the corresponding cylindrical channels. Apart from these novel results in nanoscale fluid dynamics, the whole method discussed here serves as a characterization technique for nanoporous membranes.

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