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Accelerated Transport of Particles in Confined Channels with a High Roughness Amplitude

We investigate the pressure-driven transport of particles 200 or 300 nm in diameter in shallow microfluidic channels ∼1 μm in height with a bottom wall characterized by a high roughness amplitude of ∼100 nm. This study starts with the description of an assay to generate cracks in hydrophilic thin polymer films together with a structural characterization of these corrugations. Microfluidic chips of variable height are then assembled on top of these rough surfaces, and the transport of particles is assessed by measuring the velocity distribution function for a set of pressure drops. We specifically detect anomalous transport properties for rough surfaces. The maximum particle velocity at the centerline of the channel is comparable to that obtained with smooth surfaces, but the average particle velocity increases nonlinearly with the flow rate. We suggest that the change in the boundary condition at the rough wall is not sufficient to account for our data and that the occurrence of contacts between the parti...

Authors:   Hubert Ranchon; Jean Cacheux; Benjamin Reig; Olivier Liot; Pattamon Teerapanich; Thierry Leichlé; Pierre Joseph; Aurélien Bancaud
Journal:   Langmuir
Year:   2018
DOI:   10.1021/acs.langmuir.7b03962
Publication date:   17-Jan-2018
Facts, background information, dossiers
  • pressure
  • particles
  • polymer films
More about American Chemical Society Publications
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