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https://hdl.handle.net/2440/95563
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Type: | Journal article |
Title: | Optofluidic characterization of nanoporous membranes |
Author: | Urteaga, R. Acquaroli, L. Koropecki, R. Santos, A. Alba, M. Pallareìs, J. Marsal, L. Berli, C. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2013; 29(8):2784-2789 |
Publisher: | American Chemical Society |
Issue Date: | 2013 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Raúl Urteaga, Leandro N. Acquaroli, Roberto R. Koropecki, Abel Santos, Marıá Alba, Josep Pallares̀, Lluıś F. Marsal, and Claudio L. A. Berli |
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. |
Keywords: | Nanostructures |
Rights: | © 2013 American Chemical Society |
DOI: | 10.1021/la304869y |
Published version: | http://dx.doi.org/10.1021/la304869y |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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