INVESTIGADORES
BERLI Claudio Luis Alberto
artículos
Título:
Optofluidic characterization of nanoporous membranes
Autor/es:
RAÚL URTEAGA, LEANDRO N. ACQUAROLI, ROBERTO R. KOROPECKI, CLAUDIO L. A. BERLI; A. SANTOS, M. ALBA, J. PALLARES, L. F. MARSAL
Revista:
LANGMUIR
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2013 vol. 29 p. 2784 - 2789
ISSN:
0743-7463
Resumen:
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 as H7/3. 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.
