Dynamic equilibrium explanation for nanobubbles' unusual temperature and saturation dependence

Petsev, Nikolai D.; Shell, M. Scott; Leal, L. Gary

doi:10.1103/physreve.88.010402

Cited by 45 publications

(39 citation statements)

References 49 publications

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“…While the partial pressure of gas in the liquid p dis is independent of z near a hydrophilic surface, it strongly depends on z near a hydrophobic surface due to the hydrophobic interaction between gas dissolved in water and the solid surface [35][36][37][38][39][40]. It is estimated by the following equation [25]:…”

Section: Modelmentioning

confidence: 99%

“…For a typical hydrophobic surface, the constants are as follows: a = 1.7 × 10 −20 J and b = 1 nm −1 [25,56]. A particular surface of the solid is characterized by the constant a.…”

Section: Modelmentioning

confidence: 99%

“…Several hypotheses have been proposed to explain the surprisingly long lifetime of surface nanobubbles [14,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. * k.yasui@aist.go.jp One explanation is that the gas-water interface of a nanobubble is shielded by a layer of impermeable contamination [19].…”

Section: Introductionmentioning

confidence: 99%

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Advanced dynamic-equilibrium model for a nanobubble and a micropancake on a hydrophobic or hydrophilic surface

et al. 2015

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The dynamic-equilibrium model for stabilization of a nanobubble on a hydrophobic surface by Brenner and Lohse [M. P. Brenner and D. Lohse, Phys. Rev. Lett. 101, 214505 (2008)] has been modified taking into account the van der Waals attractive force between gas molecules inside a nanobubble and solid surface. The present model is also applicable to a nanobubble on a hydrophilic surface. According to the model, the pressure inside a nanobubble is not spatially uniform and is relatively higher near the solid surface. As a result, there is gas outflux near a hydrophilic surface, while near a hydrophobic surface there is gas influx which has been already suggested. In the present model, the radius of curvature for a nanobubble depends on the distance from the solid surface because the pressure depends on it. The shape of the micropancake, which is a nearly-two-dimensional bubble, is reproduced by the present model due to the strong dependence of the radius of curvature on the distance from the solid surface. The effect of temperature on the stability of a nanobubble or micropancake is also discussed.

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Section: Modelmentioning

confidence: 99%

“…For a typical hydrophobic surface, the constants are as follows: a = 1.7 × 10 −20 J and b = 1 nm −1 [25,56]. A particular surface of the solid is characterized by the constant a.…”

Section: Modelmentioning

confidence: 99%

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Advanced dynamic-equilibrium model for a nanobubble and a micropancake on a hydrophobic or hydrophilic surface

et al. 2015

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“…This then drives a circulatory flow around the nanobubble transporting a stream of gas rich water to the three-phase line of the nanobubble, where the gas adsorbs onto the surface and diffuses back into the nanobubble. Using alternate formulations of this theory made it possible to predict the temperature and gas saturation dependency of nanobubbles 47 . What, however, remains unclear in this theory is what energetically drives the flow and therefore a non-equilibrium situation has to be assumed.…”

Section: Introductionmentioning

confidence: 99%

Exposing nanobubble-like objects to a degassed environment

et al. 2014

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The primary attribute of interest of surface nanobubbles is their unusual stability and a number of theories trying to explain this have been put forward. Interestingly, the dissolution of nanobubbles is a topic that did not receive a lot of attention yet. In this work we applied two different experimental procedures which should cause gaseous nanobubbles to completely dissolve. In our experiments we nucleated nanobubble-like objects by putting a drop of water on HOPG using a plastic syringe and disposable needle. In method A, the nanobubble-like objects were exposed to a flow of degassed water (1.17 mg/l) for 96 hours. In method B, the ambient pressure was lowered in order to degas the liquid and the nanobubble-like objects. Interestingly, the nanobubblelike objects remained stable after exposure to both methods. After thorough investigation of the procedures and materials used during our experiments, we found that the nanobubble-like object were induced by the use of disposable needles in which PDMS contaminated the water. It is very important for the nanobubble community to be aware of the fact that, although features look and behave like nanobubbles, in some cases they might in fact be or induced by contamination. The presence of contamination could also resolve some inconsistencies found in the nanobubble literature.

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“…Theoretically, small bubbles with radii of curvature of less than 1 μm should dissolve in water within microseconds [16], while in experiments surface nanobubbles dissolve much slower than expected [14,15]. Currently, their stability is explained theoretically either with a dynamic equilibrium model accounting for recirculation of gas [17,18] or the far-field length scale for gas diffusion [19]. These models assume cooperative effects of the nanobubble clusters and/or the pinning of their contact lines.…”

mentioning

confidence: 97%

Collapse of Surface Nanobubbles

et al. 2015

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Surface attached nanobubbles populate surfaces submerged in water. These nanobubbles have a much larger contact angle and longer lifetime than predicted by classical theory. Moreover, it is difficult to distinguish them from hydrophobic droplets, e.g., polymeric contamination, using standard atomic force microscopy. Here, we report fast dynamics of a three phase contact line moving over surface nanobubbles, polymeric droplets, and hydrophobic particles. The dynamics is distinct: across polymeric droplets the contact line quickly jumps and hydrophobic particles pin the contact line, while surface nanobubbles rapidly shrink once merging with the contact line, suggesting a method to differentiate nanoscopic gaseous, liquid, and solid structures. Although the collapse process of surface nanobubbles occurs within a few milliseconds, we show that it is dominated by microscopic dynamics rather than bulk hydrodynamics.

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Dynamic equilibrium explanation for nanobubbles' unusual temperature and saturation dependence

Cited by 45 publications

References 49 publications

Advanced dynamic-equilibrium model for a nanobubble and a micropancake on a hydrophobic or hydrophilic surface

Advanced dynamic-equilibrium model for a nanobubble and a micropancake on a hydrophobic or hydrophilic surface

Exposing nanobubble-like objects to a degassed environment

Collapse of Surface Nanobubbles

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