- Letter
- Open Access
Contactless rheology of finite-size air-water interfaces
Phys. Rev. Research 3, L032007 – Published 8 July, 2021
DOI: https://doi.org/10.1103/PhysRevResearch.3.L032007
Abstract
We present contactless atomic force microscopy measurements of the hydrodynamic interactions between an oscillating sphere and a bubble in water at the microscale. The size of the bubble is found to have a significant effect on the response due to the long-range capillary deformation of the air-water interface. To rationalize the experimental data, we develop a viscocapillary lubrication model accounting for the finite-size effect. The comparison between experiments and theory allows us to measure the air-water surface tension, without contact and with the volume of liquid down to tens of microliters, paving the way toward robust contactless tensiometry of polluted air-water interfaces.
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Supplemental Material
References (57)
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