Etude de nanoménisques par AFM et MEB : hydrodynamique de la couche visqueuse, élasticité de l'interface et dynamique de la ligne de contact

Julien Dupré de Baubigny 1, 2
2 CEMES-GNS - Groupe NanoSciences
CEMES - Centre d'élaboration de matériaux et d'études structurales
Abstract : The recent development of nanofluidic raises many issues about laws and characteristic lengths governing hydrodynamics and wetting at the nanometer scale. To address this issue, we used advanced microscopy techniques to probe the liquid/air interface with unconventional tips. The oscillating frequency modulation mode (FM-AFM) of the Atomic Force Microscope (AFM) gives independent access to the force applied by the liquid during an approach-withdrawal ramp, and to the conservative and dissipative components of the tip-meniscus interaction. Additional experiments conducted by electron microscopy (SEM) helped visualizing the shape of nanomeniscus to measure the resulting capillary force.The viscous layer set in motion by the oscillation of the tip is studied first. The friction coefficient and the added mass are measured by AFM-FM as a function of the viscosity of the liquid and of the excitation frequency. A model based on a classical description reflects quantitatively all experimental results enabling an evaluation of the velocity field caused by the nanoprobe.The developed methods also served to study the properties of the liquid interface. Nanomeniscus profile is modeled and validated through SEM observations. The stiffness measured experimentally by FM-AFM and described theoretically shows a logarithmic dependence with the lateral extension of the meniscus.Preliminary results are also obtained with carbon tips on which the contact line slides, giving access to the energy dissipation in the nanomeniscus and at the contact line, as well as to the anchoring of single defaults, an open issue of wetting physics.This study demonstrates that FM-AFM and SEM are relevant tools to probe quantitatively the properties of liquids at the nanoscale, opening the way for systematic studies on wetting at the nanoscale
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Julien Dupré de Baubigny. Etude de nanoménisques par AFM et MEB : hydrodynamique de la couche visqueuse, élasticité de l'interface et dynamique de la ligne de contact. Mécanique des fluides [physics.class-ph]. INSA de Toulouse, 2014. Français. ⟨NNT : 2014ISAT0032⟩. ⟨tel-01162725⟩

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