Contactless rheology of finite-size air-water interfaces
Soft Condensed Matter
2021-07-14 v3 Classical Physics
Fluid Dynamics
Abstract
We present contactless atomic-force microscopy measurements of the hydrodynamic interactions between a rigid sphere and an air bubble in water at the micro-scale. 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, paving the way towards robust contactless tensiometry of polluted air-water interfaces.
Keywords
Cite
@article{arxiv.2009.14531,
title = {Contactless rheology of finite-size air-water interfaces},
author = {Vincent Bertin and Zaicheng Zhang and Rodolphe Boisgard and Christine Grauby-Heywang and Elie Raphael and Thomas Salez and Abdelhamid Maali},
journal= {arXiv preprint arXiv:2009.14531},
year = {2021}
}