Sub-micron flow of complex fluids
type: Dataset
description: Rheology of high molecular weight polymer solutions at submicroscale is investigated, with a particular emphasis on the wall slip characterization. Our approach is to measure the velocity of a pressure-driven flow in sub-microchannels in order to determine an effective viscosity of fluids. We have been using fluorescence photobleaching as a non-invasive technique to evaluate the velocity of a pressure-driven flow in 175 to 4000 nm high channels. A striking reduction of the effective viscosity is observed with the confinement, as compared to the bulk one. Direct measurement of slip velocity in microchannels is performed, using z-resolved micro-Particle Image Velocimetry (PIV). This study enables to draw two important conclusions, which have never been experimentally demonstrated. Slippage of polymer solutions in the semi-dilute unentangled regime is greatly reduced by confinement. A distinction of bulk and surface phenomena seems no longer valid at the submicroscale. This experimental method is also adapted to the study of surfactant solutions flows at the submicroscale.
issued: 2026-05-11T05:21:41.494375
language: fr
modified: 2026-05-11T05:21:41.494380
contact point: Organization
  fn: CCSD
keyword: complex-fluids
keyword: confined-geometry
keyword: fluides-complexes
keyword: geometrie-confinee
keyword: infoeu-reposemanticsdoctoralthesis
keyword: nanofluidics
keyword: nanofluidique
keyword: physphysphys-chem-phphysics-physicsphysics-physicschemical-physics-physicschem-ph
keyword: rheologie
keyword: rheology
keyword: theses
landing page: https://theses.hal.science/tel-00820571

Sub-micron flow of complex fluids
type: Distribution
format: HTML
issued: 2026-05-11T05:21:41.514126
modified: 2026-05-11T05:21:41.475476
access URL: https://theses.hal.science/tel-00820571

test_moissonnage_selune
type: Agent