Generation and Stability of Bulk Nanobubbles

Oh, Seung Hoon; Kim, Jong Min

doi:10.1021/acs.langmuir.7b00510

Cited by 141 publications

(116 citation statements)

References 33 publications

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“…Bulk nanobubbles (BNBs) are an emerging field which is attracting much attention from researchers and industrial practitioners alike. Their existence has been reported in a number of recent experimental studies [1][2][3][4] and strong indirect evidence has been provided to show that such nano-entities must be gas bubbles. 5,6 Nonetheless, considerable speculation and controversy still exist about the existence and nature of BNBs, their origin and their extraordinary longevity which contradicts predictions of the diffusive gas transport based on the Epstein and Plesset theory.…”

Section: Introductionmentioning

confidence: 99%

Proving and interpreting the spontaneous formation of bulk nanobubbles in aqueous organic solvent solutions: effects of solvent type and content

Jadhav

Barigou

2020

Soft Matter

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We show that the mixing of organic solvents with pure water leads to the spontaneous formation of suspended nano-entities which exhibit long-term stability on the scale of months. A wide range of solvents representing different functional groups are studied: methanol, ethanol, propanol, acetone, DMSO and formamide. We use various physical and chemical analytical techniques to provide compounded evidence that the nano-entities observed in all these aqueous solvent solutions must be gas-filled nanobubbles as they cannot be attributed to solvent nanodroplets, impurities or contamination. The nanobubble suspensions are characterized in terms of their bubble size distribution, bubble number density and zeta potential. The bubble number density achieved is a function of the type of solvent. It increases sharply with solvent content, reaching a maximum at an intermediate solvent concentration, before falling off to zero. We show that, whilst bulk nanobubbles can exist in pure water, they cannot exist in pure organic solvents and they disappear at some organic solvent-water ratio depending on the type of solvent. The gas solubility of the solvent relative to water as well as the molecular structure of the solvent are determining factors in the formation and stability of bulk nanobubbles. These phenomena are discussed and interpreted in the light of the experimental results obtained.

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Section: Introductionmentioning

confidence: 99%

Proving and interpreting the spontaneous formation of bulk nanobubbles in aqueous organic solvent solutions: effects of solvent type and content

Jadhav

Barigou

2020

Soft Matter

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“…After 48 h, the most probable diameters became 115 nm and 500 nm. Both sizes of nanobubbles became larger with the lapse of time, Ostwald ripening rule is likely to be followed during nanobubbles growth 32–34 . The number size distribution of the formed N 2 BNBs in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…The generated nanobubbles by using a baffled high intensity agitation (BHIA) cell could exist for 5 h in surfactants-free solution, and up to 24 h in presence of surfactants 36 . Also, Oh and Kim 34 found that the CO 2 nanobubbles fabricated by a gas-liquid mixing method has high concentration over 24 h (up to (2.94 ± 0.16) × 10 8 particles/ml with the mean diameter increasing to 110.00 ± 4.58 nm). Even O 2 nanobubbles with the diameter of 137 nm remain to be detected by DLS on sixth day in absence of additives 27 .…”

Section: Resultsmentioning

confidence: 97%

Generation and Stability of Size-Adjustable Bulk Nanobubbles Based on Periodic Pressure Change

Wang

Zhao

et al. 2019

Sci Rep

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Recently, bulk nanobubbles have attracted intensive attention due to the unique physicochemical properties and important potential applications in various fields. In this study, periodic pressure change was introduced to generate bulk nanobubbles. N2 nanobubbles with bimodal distribution and excellent stabilization were fabricated in nitrogen-saturated water solution. O2 and CO2 nanobubbles have also been created using this method and both have good stability. The influence of the action time of periodic pressure change on the generated N2 nanobubbles size was studied. It was interestingly found that, the size of the formed nanobubbles decreases with the increase of action time under constant frequency, which could be explained by the difference in the shrinkage and growth rate under different pressure conditions, thereby size-adjustable nanobubbles can be formed by regulating operating time. This study might provide valuable methodology for further investigations about properties and performances of bulk nanobubbles.

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“…192 This feature stands in contrast with microbubbles, which slowly rise towards the surface. Interestingly, nanobubbles generally have a negative surface charge according to theoretical and experimental evidence, 192,197,[203][204][205] although this might depend on solution pH. 187 The negative charge results in an outwards repulsive force on the surface, counteracting the high surface tension.…”

Section: Bubble Mechanism: the Existential Crisis Of Nanobubblesmentioning

confidence: 99%

Plasma physics of liquids—A focused review

Vanraes

Bogaerts

2018

Applied Physics Reviews

179

118

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The interaction of plasma with liquids has led to various established industrial implementations as well as promising applications, including high-voltage switching, chemical analysis, nanomaterial synthesis, and plasma medicine. Along with these numerous accomplishments, the physics of plasma in liquid or in contact with a liquid surface has emerged as a bipartite research field, for which we introduce here the term "plasma physics of liquids." Despite the intensive research investments during the recent decennia, this field is plagued by some controversies and gaps in knowledge, which might restrict further progress. The main difficulties in understanding revolve around the basic mechanisms of plasma initiation in the liquid phase and the electrical interactions at a plasma-liquid interface, which require an interdisciplinary approach. This review aims to provide the wide applied physics community with a general overview of the field, as well as the opportunities for interdisciplinary research on topics, such as nanobubbles and the floating water bridge, and involving the research domains of amorphous semiconductors, solid state physics, thermodynamics, material science, analytical chemistry, electrochemistry, and molecular dynamics simulations. In addition, we provoke awareness of experts in the field on yet underappreciated question marks. Accordingly, a strategy for future experimental and simulation work is proposed.

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Generation and Stability of Bulk Nanobubbles

Cited by 141 publications

References 33 publications

Proving and interpreting the spontaneous formation of bulk nanobubbles in aqueous organic solvent solutions: effects of solvent type and content

Proving and interpreting the spontaneous formation of bulk nanobubbles in aqueous organic solvent solutions: effects of solvent type and content

Generation and Stability of Size-Adjustable Bulk Nanobubbles Based on Periodic Pressure Change

Plasma physics of liquids—A focused review

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