Physicochemical approach to nanobubble solutions

Small bubbles of nitrogen, methane, or argon with an average radius of 50 nm, as measured by scanning electron microscopy, were prepared under atmospheric conditions. The lifetime of the nanobubbles extended to more than two weeks. The total amount of gases in the nanobubble solutions reached 600 cm...

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Bibliographic Details
Published in:Chemical engineering science 2010-02, Vol.65 (3), p.1296-1300
Main Authors: Ohgaki, Kazunari, Khanh, Nguyen Quoc, Joden, Yasuhiro, Tsuji, Atsushi, Nakagawa, Takaharu
Format: Article
Language:English
Subjects:
Applied sciences
Bubble
Chemical engineering
Exact sciences and technology
Gas solubility
Nanostructure
Solution
Stability
Surface tension
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Summary:Small bubbles of nitrogen, methane, or argon with an average radius of 50 nm, as measured by scanning electron microscopy, were prepared under atmospheric conditions. The lifetime of the nanobubbles extended to more than two weeks. The total amount of gases in the nanobubble solutions reached 600 cm 3 per 1 dm 3 of water, and the liquid density was about 0.988 g/cm 3. The internal pressure of the nanobubbles was estimated to be 6 MPa. The number of nanobubbles was 1.9×10 16 bubbles per 1 dm 3 of water. These findings show that almost no gas samples are dissolved homogeneously in the aqueous solution and that the vast majority is present in the form of nanobubbles, that is, nanobubbles should be thermodynamically unstable. Attenuated total reflectance infrared spectroscopy showed that the surfaces of the nanobubbles contain hard hydrogen bonds that may reduce the diffusivity of gases through the interfacial film.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2009.10.003