Precursor Film Spreading during Liquid Imbibition in Nanoporous Photonic Crystals
| Autor: | Patrick Huber, Guido Dittrich, Luisa Guadalupe Cencha, Claudio Luis Alberto Berli, Raul Urteaga |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon General Physics and Astronomy chemistry.chemical_element FOS: Physical sciences Optofluidics Condensed Matter - Soft Condensed Matter 01 natural sciences Physics::Fluid Dynamics Film precursor purl.org/becyt/ford/1 [https] 0103 physical sciences ddc:530 010306 general physics Porosity Nanoscopic scale Technik [600] Photonic crystal Nanoporous 600: Technik Fluid Dynamics (physics.flu-dyn) Radius Physics - Fluid Dynamics purl.org/becyt/ford/1.3 [https] Fluid transport Nanopore imbibition Condensed Matter::Soft Condensed Matter Photonics chemistry Chemical physics Physics - Soft Condensed Matter Soft Condensed Matter (cond-mat.soft) Imbibition ddc:600 Optics (physics.optics) Physics - Optics |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Physical Review Letters 125 (23): 234502 (2020-12-01) Physical review letters 125(23), 234502 (2020). doi:10.1103/PhysRevLett.125.234502 |
| DOI: | 10.1103/PhysRevLett.125.234502 |
| Popis: | Physical review letters 125(23), 234502 (2020). doi:10.1103/PhysRevLett.125.234502 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. Published by APS, College Park, Md. |
| Databáze: | OpenAIRE |
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