Resolving the Pinning Force of Nanobubbles with Optical Microscopy

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Author(s)
Tan, Beng Hau
An, Hongjie
Ohl, Claus-Dieter
Griffith University Author(s)
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2017
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Abstract

Many of the remarkable properties of surface nanobubbles, such as unusually small contact angles and long lifetimes, are related to the force that pins them onto their substrates. This pinning force is yet to be quantified experimentally. Here, surface-attached nanobubbles are pulled with an atomic force microscope tip while their mechanical responses are observed with total internal reflection fluorescence microscopy. We estimate that a pinning force on the order of 0.1μN is required to unpin a nanobubble from its substrate. The maximum force that the tip can exert on the nanobubble is limited by the stability of the neck pulled from the bubble and is enhanced by the hydrophobicity of the tip.

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Physical Review Letters
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Subject
Mathematical sciences
Physical sciences
Engineering
Science & Technology
Physics, Multidisciplinary
SURFACE NANOBUBBLES
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Citation
Tan, BH; An, H; Ohl, C-D, Resolving the Pinning Force of Nanobubbles with Optical Microscopy, Physical Review Letters, 2017, 118 (5)
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