Interfacial nanobubbles produced by long-time preserved cold water

Zhou, Limin; Wang, Shuo; Qiu, Jie; Wang, Lei; Wang, Xing-Ya; Li, B.; Zhang, Lijuan; Hu, Jun

doi:10.1088/1674-1056/26/10/106803

Cited by 26 publications

(19 citation statements)

References 69 publications

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“…11,17,18 A host of techniques have been used to study surface nanobubbles, including AFM imaging in liquid, infrared spectroscopy, 19 total internal reflection fluorescence, 20,21 transmission electron microscopy, 22 dark-field microscopy, 23 surface plasmon resonance microscopy, 24,25 and so on. Further investigation revealed that surface nanobubbles are not an intrinsic phenomenon of a hydrophobic surface in water but are induced by temporary gas oversaturation 26 and electrochemical reactions. 27,28 Theoretical studies demonstrated that gas oversaturation and pinning effects at the three-phase contact line are essential to stabilize surface nanobubbles.…”

Section: ■ Introductionmentioning

confidence: 99%

Ultrahigh Density of Gas Molecules Confined in Surface Nanobubbles in Ambient Water

et al. 2020

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To understand the unexpected and puzzling long-term stability of nanoscale gas bubbles, it is crucial to probe their nature and intrinsic properties. We report herein synchrotron-based scanning transmission X-ray microscopy (STXM) evidence of highly condensed oxygen gas molecules trapped as surface nanobubbles. Remarkably, the analysis of absorption spectra of a single nanobubble revealed that the oxygen density inside was 1–2 orders of magnitude higher than that in atmospheric pressure, and these bubbles were found in a highly saturated liquid environment with the estimated oxygen concentration to be hundreds of times higher than the known oxygen solubility in equilibrium. Molecular dynamics simulations were performed to investigate the stability of surface nanobubbles on a heterogeneous substrate in gas-oversaturated water. These results indicated that gas molecules within confinement such as the nanobubbles could maintain a dense state instead of the ideal gas state, as long as their surrounding liquid is supersaturated. Our findings should help explain the surprisingly long lifetime of the nanobubbles and shed light on nanoscale gas aggregation behaviors.

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Section: ■ Introductionmentioning

confidence: 99%

Ultrahigh Density of Gas Molecules Confined in Surface Nanobubbles in Ambient Water

et al. 2020

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“…Later on, a series of follow-up experiments demonstrated the effectiveness of electrochemical methods to generate nanobubbles, and the process of early bubble formation was observed using confocal fluorescence microscope . In recent years, there have emerged more new methods for nanobubbles generating, such as high-power microwave irradiation, air-saturated cooling water deposition, , and so on. Although these techniques for generating nanobubbles were good at their cleanliness and accuracy, and suitable for the studies in laboratories, their production efficiency limited their applications.…”

Section: Introductionmentioning

confidence: 99%

Formation and Stability of Bulk Nanobubbles by Vibration

et al. 2020

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Vibration is a very common process in nature, industry, biology, etc. Thus, whether vibration could induce the formation of nanoscale bubbles in water or not is very important for some chemical or biological reactions. In this paper, we designed a control experiment to simulate the vibration process to explore the production and stability of bulk nanobubbles. Experimental results showed that the vibration could indeed induce the formation of a certain number of bulk nanobubbles in water. In addition, the formation of bulk nanobubbles depended on the frequency and time of vibration. The existence of gas–liquid interface played an important role for the bulk nanobubbles formation because that external air is a possible important gas source. Our findings would be helpful to explore the mystical behavior of nanobubbles in natural processes.

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“…The methods to produce and measure the bulk nanobubbles still need to be explored. Recently, we used nanoparticle tracking analysis (NTA) to detect the size and concentration of bulk nanobubbles produced by exchanging ethanol and water, as well as cold water and decompressing. ,− It was proved as a powerful tool to give the size distribution and concentration of bulk nanobubbles compared with conventional dynamic light scattering. − Another powerful technique is synchrotron based X-ray fluorescence absorption, which can provide the chemical information in a bulk solution …”

Section: Introductionmentioning

confidence: 99%

Formation and Stability of Bulk Nanobubbles in Different Solutions

Xiao

Quan

et al. 2019

Langmuir

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The existence of bulk nanobubbles is still controversial in spite of their significance in a large range of applications. Here, we developed a new method of compression−decompression to produce controllably bulk nanobubbles. Then, we further investigated the generation of bulk nanobubbles in pure water, acid, alkaline, and salt solutions using nanoparticle tracking analysis. The results indicated that the concentration of bulk nanobubbles depends on the decompression time and would reach a maximum value when the decompression time is about 30 min for the pure water system. More importantly, we gave a relatively direct evidence of the existence of bulk nanobubbles by measuring the X-ray fluorescence intensity of Kr in acid, alkaline, and salt solutions. It is shown that the decrease tendency in intensity of Kr in alkaline solution is similar to that in the concentration of bulk nanobubbles with the deposited time, indicating that the bulk nanobubbles produced indeed have gas inside. Furthermore, the concentration and stability of bulk nanobubbles in an alkaline solution are greatest compared with other two solutions regardless of gas types. The concentration of bulk nanobubbles will decrease in the order alkaline > acid/pure water > salt solutions. We believe that our results should be very helpful in understanding the formation and stability of bulk nanobubbles in different solutions.

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Interfacial nanobubbles produced by long-time preserved cold water

Cited by 26 publications

References 69 publications

Ultrahigh Density of Gas Molecules Confined in Surface Nanobubbles in Ambient Water

Ultrahigh Density of Gas Molecules Confined in Surface Nanobubbles in Ambient Water

Formation and Stability of Bulk Nanobubbles by Vibration

Formation and Stability of Bulk Nanobubbles in Different Solutions

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