Journal article

The length scales for stable gas nanobubbles at liquid/solid surfaces

Lijuan Zhang, Xuehua Zhang, Yi Zhang, Jun Hu, Haiping Fang

SOFT MATTER | ROYAL SOC CHEMISTRY | Published : 2010

Abstract

We present results focusing on whether gas bubbles are stable at all length scales at liquid/solid surfaces. Tapping mode atomic force microscopy was used to observe nanoscale bubbles of air or hydrogen produced by two methods on hydrophilic and hydrophobic solid surfaces. The observed nanobubbles of air or hydrogen always have curvature radii of less than 2.0 μm and heights of less than 100 nm, suggesting the possible instability of these nanobubbles beyond these length scales. This is further supported by the observation of blank circular areas on the electrode surface, which are interpreted as footprints of departed large bubbles with curvature radii equal to or above 2.0 μm from the surf..

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University of Melbourne Researchers

Grants

Awarded by Chinese Academy of Sciences, National Science Foundation of China


Awarded by National Basic Research Program of China


Awarded by Australian Research Council


Funding Acknowledgements

This work was supported by the Chinese Academy of Sciences, National Science Foundation of China under grant Nos 10674146 and 10825520 and the National Basic Research Program of China under grant No. 2007CB936000. Xuehua Zhang acknowledges support from Australian Research Council's Discovery Project funding scheme (Australian Postdoctoral Fellowship (DP0880152)).