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Publisher DOI: 10.1103/PhysRevLett.125.234502
arXiv ID: 2011.05401v1
Title: Precursor film spreading during liquid imbibition in nanoporous photonic crystals
Language: English
Authors: Cencha, Luisa G. 
Dittrich, Guido 
Huber, Patrick  
Berli, Claudio L. A. 
Urteaga, Raul 
Keywords: Physics - Soft Condensed Matter; Physics - Soft Condensed Matter; Physics - Fluid Dynamics; Physics - Optics
Issue Date: 1-Dec-2020
Source: Physical Review Letters 125 (23): 234502 (2020-12-01)
Abstract (english): 
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.
DOI: 10.15480/882.3248
ISSN: 0031-9007
Journal: Physical review letters 
Institute: Werkstoffphysik und -technologie M-22 
Center for Integrated Multiscale Material Systems M-2 
Document Type: Article
Project: Dynamische Elektrobenetzung an Nanoporösen Oberflächen: Schaltbare Tropfenspreitung, Imbition und Elastokapillarität 
Oxidische 3d-Gerüststrukturen für benetzungsvermittelte Formgebung von Polymeren und benetzungsvermitteltes Herstellen von Fügeverbindungen mit Polymeren 
SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen 
SFB 986: Teilprojekt C10 - Photonische Metamaterialien mit anpassbarer und schaltbarer Anisotropie durch Funktionalisierung von porösen Festkörpern mit Flüssigkristallen 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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