Artículo
Precursor Film Spreading during Liquid Imbibition in Nanoporous Photonic Crystals
Cencha, Luisa Guadalupe
; Dittrich, Guido; Huber, Patrick; Berli, Claudio Luis Alberto
; Urteaga, Raul
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Fecha de publicación:
12/2020
Editorial:
American Physical Society
Revista:
Physical Review Letters
ISSN:
0031-9007
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
When a macroscopic droplet spreads, a thin precursor film of liquid moves ahead of the advancing liquid-solid-vapor contact line. Whereas this phenomenon has been explored extensively for planar solid substrates, its presence in nanostructured geometries has barely been studied so far, despite its importance for many natural and technological fluid transport processes. Here we use porous photonic crystals in silicon to resolve by light interferometry capillarity-driven spreading of liquid fronts in pores of few nanometers in radius. Upon spatiotemporal rescaling the fluid profiles collapse on master curves indicating that all imbibition fronts follow a square-root-of-time broadening dynamics. For the simple liquid (glycerol) a sharp front with a widening typical of Lucas-Washburn capillary-rise dynamics in a medium with pore-size distribution occurs. By contrast, for a polymer (PDMS) a precursor film moving ahead of the main menisci entirely alters the nature of the nanoscale transport, in agreement with predictions of computer simulations.
Palabras clave:
Film precursor
,
Nanopore imbibition
,
Optofluidics
,
Photonics
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Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Cencha, Luisa Guadalupe; Dittrich, Guido; Huber, Patrick; Berli, Claudio Luis Alberto; Urteaga, Raul; Precursor Film Spreading during Liquid Imbibition in Nanoporous Photonic Crystals; American Physical Society; Physical Review Letters; 125; 23; 12-2020; 1-6
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