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Viscocapillary Response of Gas Bubbles Probed by Thermal Noise Atomic Force Measurement
Yuliang Wang1, Binglin Zeng1, Hadush Tedros Alem1
1School of Mechanical Engineering and Automation, Beihang University , 37 Xueyuan Rd., Haidian District, Beijing 100191, China.
Abstract:
We present thermal noise measurements of a vibrating sphere close to microsized air bubbles in water with an atomic force microscope. The sphere was glued at the end of a cantilever with a resonance frequency of few kHz. The subangstrom thermal motion of the microsphere reveals an elastohydrodynamic coupling between the sphere and the air bubble. The results are in perfect agreement with a model incorporating macroscopic capillarity and fluid flow on the bubble surface with full slip boundary conditions.
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