Mechanism of the Decrease in Surface Tension by Bulk Nanobubbles (Ultrafine Bubbles)

Yasui, Kyuichi; Tuziuti, Toru; Kanematsu, Wataru

doi:10.1021/acs.langmuir.3c02545

Cited by 4 publications

(2 citation statements)

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“…20,21 This can be a source for contamination as this lubricating oil is believed to increase the TOC content in the resulting nanobubble suspension produced with these nanobubble generators. 22 Due to the hydrophobic nature of these oil-based contaminants, these impurities can potentially bridge the hydrophobic particles. However, when we discuss the bridging phenomenon of mildly hydrophobic particles in the presence of nanobubbles, these hydrophobic impurities can potentially be picked up by the nanobubbles much more prominently as nanobubbles by nature exhibit a much higher degree of hydrophobicity as compared with the mildly hydrophobic particles.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, most of these experiments were conducted in a very controlled environment, where surface nanobubbles were produced mostly through solvent exchange method. ,, Larger scale experiments to investigate nanobubble-assisted particle–particle interactions involve the usage of nanobubble generators. These nanobubble generators incorporate commercially available water pumps, which are known to possess a lining of lubrication oil. , This can be a source for contamination as this lubricating oil is believed to increase the TOC content in the resulting nanobubble suspension produced with these nanobubble generators . Due to the hydrophobic nature of these oil-based contaminants, these impurities can potentially bridge the hydrophobic particles.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Role of Surface Charge on Nanobubble Capillary Bridging during Particle–Particle Interaction

Dutta,

Mitra,

Nirmalkar

2024

Langmuir

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The interactions between particles due to longrange hydrophobic forces have been extensively investigated. The hydrophobic force is likely a capillary force that arises from the formation of capillary bridges due to the merging of nanobubbles. In this study, we aim to investigate the impact of the nanobubble surface charge on the capillary bridge and, subsequently, the interaction between particles. The surface charge of the nanobubbles was altered in the presence of various surfactants (cationic, anionic, and nonionic) and salts (mono-, di-, and trivalent). The particle−particle interaction was quantified by measuring the aggregate size of the hydrophobized glass particles. Both experimental and theoretical findings confirm that the interaction between particles was enhanced when the surface potential of the nanobubble was around the neutral regime. This is probably because, when the surface potential was close to neutral, the interaction between two surface-deposited nanobubbles dominated over electrostatic repulsion, which was more conducive to the formation of the nanobubble capillary bridge. The estimation of the constrained Gibbs potential also showed the capillary bridge to be more stable when surface charge density along the bridge gas−liquid interface was minimal.

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Section: ■ Introductionmentioning

confidence: 99%