On Some Aspects of Nanobubble-Containing Systems
Theoretical studies are reviewed for bulk nanobubbles (ultrafine bubbles (UFBs)), which are gas bubbles smaller than 1 μm in diameter. The dynamic equilibrium model is discussed as a promising model for the stability of a UFB against dissolution; more than half of the surface of a UFB should be cove...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/13/2175 |
| _version_ | 1797408507917500416 |
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| author | Kyuichi Yasui |
| author_facet | Kyuichi Yasui |
| author_sort | Kyuichi Yasui |
| collection | DOAJ |
| description | Theoretical studies are reviewed for bulk nanobubbles (ultrafine bubbles (UFBs)), which are gas bubbles smaller than 1 μm in diameter. The dynamic equilibrium model is discussed as a promising model for the stability of a UFB against dissolution; more than half of the surface of a UFB should be covered with hydrophobic material (impurity). OH radicals are produced during hydrodynamic or acoustic cavitation to produce UFBs. After stopping cavitation, OH radicals are generated through chemical reactions of H<sub>2</sub>O<sub>2</sub> and O<sub>3</sub> in the liquid water. The possibility of radical generation during the bubble dissolution is also discussed based on numerical simulations. UFBs are concentrated on the liquid surface according to the dynamic equilibrium model. As a result, rupture of liquid film is accelerated by the presence of UFBs, which results in a reduction in “surface tension”, measured by the du Noüy ring method. Finally, the interaction of UFBs with a solid surface is discussed. |
| first_indexed | 2024-03-09T04:00:28Z |
| format | Article |
| id | doaj.art-77435ae137ea4d6b89e38e39c73eb656 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T04:00:28Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-77435ae137ea4d6b89e38e39c73eb6562023-12-03T14:14:42ZengMDPI AGNanomaterials2079-49912022-06-011213217510.3390/nano12132175On Some Aspects of Nanobubble-Containing SystemsKyuichi Yasui0National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, JapanTheoretical studies are reviewed for bulk nanobubbles (ultrafine bubbles (UFBs)), which are gas bubbles smaller than 1 μm in diameter. The dynamic equilibrium model is discussed as a promising model for the stability of a UFB against dissolution; more than half of the surface of a UFB should be covered with hydrophobic material (impurity). OH radicals are produced during hydrodynamic or acoustic cavitation to produce UFBs. After stopping cavitation, OH radicals are generated through chemical reactions of H<sub>2</sub>O<sub>2</sub> and O<sub>3</sub> in the liquid water. The possibility of radical generation during the bubble dissolution is also discussed based on numerical simulations. UFBs are concentrated on the liquid surface according to the dynamic equilibrium model. As a result, rupture of liquid film is accelerated by the presence of UFBs, which results in a reduction in “surface tension”, measured by the du Noüy ring method. Finally, the interaction of UFBs with a solid surface is discussed.https://www.mdpi.com/2079-4991/12/13/2175bulk nanobubblesultrafine bubbles (UFBs)dynamic equilibrium modelhydrophobic impurityOH radicalscavitation |
| spellingShingle | Kyuichi Yasui On Some Aspects of Nanobubble-Containing Systems Nanomaterials bulk nanobubbles ultrafine bubbles (UFBs) dynamic equilibrium model hydrophobic impurity OH radicals cavitation |
| title | On Some Aspects of Nanobubble-Containing Systems |
| title_full | On Some Aspects of Nanobubble-Containing Systems |
| title_fullStr | On Some Aspects of Nanobubble-Containing Systems |
| title_full_unstemmed | On Some Aspects of Nanobubble-Containing Systems |
| title_short | On Some Aspects of Nanobubble-Containing Systems |
| title_sort | on some aspects of nanobubble containing systems |
| topic | bulk nanobubbles ultrafine bubbles (UFBs) dynamic equilibrium model hydrophobic impurity OH radicals cavitation |
| url | https://www.mdpi.com/2079-4991/12/13/2175 |
| work_keys_str_mv | AT kyuichiyasui onsomeaspectsofnanobubblecontainingsystems |