On the Stability of Nanobubbles in Water

Boshenyatov, B. V.; Kosharidze, S. I.; Levin, Yu. K.

doi:10.1007/s11182-019-01618-x

Cited by 24 publications

(10 citation statements)

References 4 publications

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“…In this subsection, we introduce a nondimensional time as t * = t /τ, where τ is the characteristic time, i.e., Henry time that characterizes the ideal longevity based on the ideal gas state equation and is expressed as τ = k H R 0 2 3 B T D 2 where k H is the Henry constant at atmospheric pressure and B is the universal gas constant at T = 298 K and p = 1 atm. It is noteworthy that the Henry time has considered the gas type effect in variable k H ; thus, t * can be employed for nondimensionalizing the dissolution time of various nonpolar gas molecules, e.g., nitrogen, hydrogen, and oxygen.…”

Section: Resultsmentioning

confidence: 99%

Role of Mutual Diffusion in the Dissolution Behavior of One Primary Bulk Gas Nanobubble in Liquid: A Molecular Dynamics Study

Zhang

Wang

2023

Langmuir

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Dissolution of one primary bulk gas nanobubble in an undersaturated liquid constitutes one of the underlying issues of the exceptional stability of bulk gas nanobubble population. In this paper, the mutual diffusion coefficient at the gas−liquid interface of one primary bulk gas nanobubble is investigated via all-atom molecular dynamics simulation, and the applicability of the Epstein−Plesset theory is verified. The mutual diffusion coefficient, different from the self-diffusion coefficient in bulk gas or bulk liquid, is essentially determined by the chemical potential due to its driving role in the mass transfer across the interface. We could ascribe the low-rate dissolution of one primary bulk gas nanobubble in an undersaturated liquid to the slight attenuation of the mutual diffusion coefficient at the interface. The results show that the dissolution process of one primary bulk gas nanobubble in an undersaturated liquid fundamentally obeys the Epstein−Plesset theory and that the macroscopic dissolution rate is intrinsically determined by the gas mutual diffusion coefficient at the interface rather than the self-diffusion coefficient in the bulk phase. The mass transfer viewpoint from the present study might actively promote subsequent studies on the super-stability of bulk gas nanobubble population in liquid.

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Section: Resultsmentioning

confidence: 99%

Role of Mutual Diffusion in the Dissolution Behavior of One Primary Bulk Gas Nanobubble in Liquid: A Molecular Dynamics Study

Zhang

Wang

2023

Langmuir

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“…If all the particles in suspension show a high zeta potential (negative or positive), they tend to be stable for a long time; otherwise, they are apt to aggregate and coalesce (Gurung et al 2016 ). The surface of nanobubbles adsorbed with negatively charged OH − ions is called the surface-charged ionic layer which electrically attracts positively charged H 3 O + ions and consequently forms an electric double layer (Boshenyatov et al 2019 ). The electrostatic repulsion forces caused by the overlap of electric double layers among neighbouring bubbles provide resistance against bubble coalescence; hence, the nanobubbles show unexpected stability and durability (Calgaroto et al 2014 ).…”

Section: Fundamental Propertiesmentioning

confidence: 99%

Role of bulk nanobubbles in removing organic pollutants in wastewater treatment

Zhang

Cen

et al. 2021

AMB Expr

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The occurrence of a variety of organic pollutants has complicated wastewater treatment; thus, the search for sustainable and effective treatment technology has drawn significant attention. In recent years, bulk nanobubbles, which have extraordinary properties differing from those of microbubbles, including high stability and long residence times in water, large specific surface areas, high gas transfer efficiency and interface potential, and the capability to generate free radicals, have shown attractive technological advantages and promising application prospects for wastewater treatment. In this review, the basic characteristics of bulk nanobubbles are summarized in detail, and recent findings related to their implementation pathways and mechanisms in organic wastewater treatment are systematically discussed, which includes improving the air flotation process, increasing water aeration to promote aerobic biological technologies including biological activated carbon, activated sludge, and membrane bioreactors, and generating active free radicals that oxidise organic compounds. Finally, the current technological difficulties of bulk nanobubbles are analysed, and future focus areas for research on bulk nanobubble technology are also proposed.

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“…A number of experimental and theoretical studies of bulk nanobubbles (BNB) has increased sharply in recent years [1][2][3][4][5][6][7][8][9][10][11] due to their wide application in various fields of science and technology. It is believed that the main stabilizing factor of BNB are the ions adsorbed on its surface.…”

mentioning

confidence: 99%

“…It is believed that the main stabilizing factor of BNB are the ions adsorbed on its surface. Electrokinetic potential, on the one hand, prevents BNB coagulation, and, on the other hand, creates a tensile negative electrostatic pressure (EP) that compensates for the compressive Laplace pressure (LP) and prevents diffusive dissolution of the BNB [1][2][3][7][8][9].…”

mentioning

confidence: 99%