2020/06/22 by Mohand Larbi Mokrane, Mokrane, Mohand Larbi, Térence Desclaux +7
Engineering · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Microfluidic and Bio-sensing Technologies #Microfluidic and Capillary Electrophoresis Applications #Nanopore and Nanochannel Transport Studies #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.2006.13082
openalex publication_date 2020/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This paper describes an experimental study of filtration of a colloidal\nsuspension using microfluidic devices. A suspension of micrometer-scale\ncolloids flows through parallel slit-shaped pores at fixed pressure drop. Clogs\nand cakes are systematically observed at pore entrance, for variable applied\npressure drop and ionic strength. Based on image analysis of the layer of\ncolloids close to the device wall, global and local studies are performed to\nanalyse in detail the near-wall layer microstructure. Whereas global porosity\nof this layer does not seem to be affected by ionic strength and applied\npressure drop, a local study shows some heterogeneity: clogs are more porous at\nthe vicinity of the pore than far away. An analysis of medium-range order using\nradial distribution function shows a slightly more organized state at high\nionic strength. This is confirmed by a local analysis using two-dimension\ncontinuous wavelet decomposition: the typical size of crystals of colloids is\nlarger for low ionic strength, and it increases with distance from the pores.\nWe bring these results together in a phase diagram involving colloid-colloid\nrepulsive interactions and fluid velocity.\n