Non-contact rheology of finite-size air-water interfaces
Résumé
We present non-contact atomic-force-microscopy measurements of the hydrodynamic interactions between a rigid sphere and an air bubble in water at the microscale. The size of the bubble is found to have a significant effect on the mechanical response due to the long-range capillary deformation of the air-water interface. We develop a viscocapillary lubrication model accounting for the finite-size effect that allows to rationalize the experimental data. This comparison allows us to measure the air-water surface tension, without contact and thus wetting, paving the way towards robust non-contact tensiometry of polluted air-water interfaces.
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