Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D25: Focus Session: Hydrodynamics of Particles and Macromolecules at Fluid Interfaces II
2:30 PM–4:27 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B313
Chair: Carlos E. Colosqui, Stony Brook University
Abstract ID: BAPS.2018.DFD.D25.2
Abstract: D25.00002 : Microparticles hydrodynamics close to an Air-Water Interface*
2:43 PM–2:56 PM
Presenter:
Maurizio Nobili
(Laboratoire Charles Coulomb, Université Montpellier/CNRS)
Authors:
Stefano Villa
(Laboratoire Charles Coulomb, Université Montpellier/CNRS)
Antonio Stocco
(Laboratoire Charles Coulomb, Université Montpellier/CNRS)
Christophe Blanc
(Laboratoire Charles Coulomb, Université Montpellier/CNRS)
Maurizio Nobili
(Laboratoire Charles Coulomb, Université Montpellier/CNRS)
Despite being by far among the most widespread interface on Earth, with a pervasive presence in environment, biology, industry and daily life, physical phenomena at Air-Water Interface (AWI) are still largely elusive. This fact is related to the complexity of AWI with its peculiar electrostatic and flow boundary conditions.
In this paper, we present a study of the dynamics and interactions of charged microparticles diffusing at submicrometric distances from an AWI. An interferometric set-up mounted on a microscope gives access to an highly resolved trajectory of the colloid (5-10 nm). Contrary to other established techniques (like TIRM and holography) our technique has the great advantage of allowing the measure of the absolute particle-interface distance. In order to control the electrostatic we use different concentration of salt and different pH in association with pH dependent charged microparticles.
Surprisingly new equilibrium distances from the AWI are measured not accounted by established theories. In addition different drags corresponding to different boundaries conditions are found for same combination of particle and AWI depending on the particle’s motion direction namely perpendicular or parallel to the AWI.
*We acknowledge fundings from ANR grant ANR-14-CE07-0039-01.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D25.2
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