title: A Three-Step Scenario Involved in Particle Capture on a Pore Edge.
abstract: A scenario is proposed to describe the capture of a spherical particle around a cylindrical pore. This geometry, "ideal" as far as the problem of particle capture on a filtration membrane is concerned, is clearly relevant in view of the pore-scale geometry of nucleopore or microsieve filtration membranes, and also of some microfluidic systems used to perform fluid-particle separation. The present scenario consists of three successive steps: particle deposition on the membrane away from the pore, subsequent reentrainment of some of the deposited particles by rolling on the membrane surface, and final arrest by a stabilizing van der Waals torque when the particle rolls over the pore edge. A modeling of these three steps requires the hydrodynamic and physicochemical particle-membrane interactions to be detailed close to the singular pore edge region and raises questions concerning the role of particle surface roughness. The relevance and robustness of such of a scenario for rough micrometer-sized latex particles is emphasized and comparisons are made with existing experimental data.
authors.affiliation: †Université de Toulouse, INPT, UPS, IMFT (Institut de Mécanique des Fluides de Toulouse), Allée Camille Soula, F-31400 Toulouse, France.|‡CNRS, IMFT, F-31400 Toulouse, France.
authors.forename: Paul
authors.initials: P
authors.lastname: Duru
authors.affiliation: ¶Université de Toulouse, INPT, UPS, LGC (Laboratoire de Génie Chimique), 118 route de Narbonne, F-31062 Toulouse, France.|§CNRS, LGC, F-31030 Toulouse, France.
authors.forename: Yannick
authors.initials: Y
authors.lastname: Hallez
mesh_terms: D057446:Hydrodynamics; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation; D010316:Particle Size; D013499:Surface Properties