Hydroxyl ion stabilization of bulk nanobubbles resulting from microbubble shrinkage

Satpute, Pratik Ashutosh; Earthman, James C.

doi:10.1016/j.jcis.2020.09.100

Cited by 40 publications

(37 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface charge calculation by modified Langmuir adsorption expressions has been seen in good agreement with the experimental results over a wide range of pH [25] . The accumulation of surface charge density stabilizes the bubbles as the electrostatic pressure

) diverge must faster than the Laplace pressure (

) [18] , [26] , [27] , [28] . Interestingly, the nanobubbles are observed to be stable against temperature.…”

Section: Introductionmentioning

confidence: 99%

Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Agarwal

Trivedi

Nirmalkar

2022

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

Highlights Nanobubble density during salting-out effect increases with salting-out parameter. An ultrasound field with a high amplitude destroys the nanobubbles in salt solution. R.I. of nanobubbles in NaCl and AlCl 3 were estimated to be 1.012 and 1.302, respectively. The NBs during salting-out effect are observed to be stable only for up to three days.

show abstract

) diverge must faster than the Laplace pressure (

) [18] , [26] , [27] , [28] . Interestingly, the nanobubbles are observed to be stable against temperature.…”

Section: Introductionmentioning

confidence: 99%

Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Agarwal

Trivedi

Nirmalkar

2022

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

show abstract

“…( 2 )–Eq. ( 5 ); Satpute and Earthman 2021 ]: where p int is the internal pressure, p rep is the Maxwell pressure due to the repulsion between the negative ions adsorbed onto the bubble surface, p ext is the external pressure, p st is the pressure due to surface tension, k e is the Coulombic constant for the fluid (1.1 × 10 8 N m 2 C −2 ), σ is the surface charge density of the bubbles calculated from the zeta potential using an equation from the Debye-Hückel theory of electrical double layers, ε 0 is the permittivity of free space, ε is the dielectric constant of the fluid, λ is the Debye length, ξ is the zeta potential, I is the bulk concentration of the stabilizing ions, i.e. the OH − which is 10 −4 mol m −3 at pH 7, T is temperature, k B is Boltzmann’s constant, and N A is Avogadro’s number.…”

Section: Fundamental Propertiesmentioning

confidence: 99%

Role of bulk nanobubbles in removing organic pollutants in wastewater treatment

Zhang

Cen

et al. 2021

AMB Expr

View full text Add to dashboard Cite

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.

show abstract

“…However, if we menage to separate hydrogen and oxygen NBs, for example by diluting the solution, would they live much longer? A recent paper [49] relates stability of the regular NBs to their origin. It is assumed that long-lived NBs appear only from shrinking MBs and their stability is related to the increasing concentration of the surface charges.…”

Section: Open Problemsmentioning

confidence: 99%

Spontaneous chemical reactions between hydrogen and oxygen in nanobubbles

Svetovoy

2021

Preprint

View full text Add to dashboard Cite

Bulk nanobubbles (NBs) generated electrochemically by short voltage pulses of alternating polarity behave differently from those produced by regular methods. Only bubbles smaller than 200 nm are formed in the process and their concentration is very high. Moreover, the bubbles containing both H2 and O2 gases disappear quickly via the combustion reaction, although the reaction in such a small volume cannot happen according to the classical combustion theory. Experimental facts about these unusual NBs are reviewed and current understanding of the observed phenomena is provided. Visualisation methods of a cloud of NBs above the electrodes are briefly discussed. Experimental signatures demonstrating the reaction between the gases in NBs are considered. A surface-assisted mechanism proposed for the combustion reactions in restricted volumes with a high surface-to-volume ratio is discussed. It it explained how the same mechanism may describe the audible explosion of microbubbles, that is observed in certain circumstances.

show abstract

Hydroxyl ion stabilization of bulk nanobubbles resulting from microbubble shrinkage

Cited by 40 publications

References 22 publications

Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Role of bulk nanobubbles in removing organic pollutants in wastewater treatment

Spontaneous chemical reactions between hydrogen and oxygen in nanobubbles

Contact Info

Product

Resources

About