Characterization of Nanobubbles on Hydrophobic Surfaces in Water

Yang, Shangjiong; Dammer, Stephan M.; Brémond, Nicolas; Zandvliet, Henricus J.W.; Kooij, Ernst S.; Lohse, Detlef

doi:10.1021/la070004i

Cited by 223 publications

(261 citation statements)

References 16 publications

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“…The ice− water bath was used to enhance the dissolved O 2 level in the solution, and the temperature-increasing operation was carried out to generate oxygen bubbles at the solid−liquid interfaces. 14,27 The small contact angle of water on the diatomite (17°, JY-PHb, Jinhe Co.) showed that the diatomite was highly hydrophilic ( Figure S2). BET surface area analysis indicated a specific surface area of 7.4 m 2 /g (ASAP-2010, Micromeritics) for the diatomite.…”

Section: ■ Methodsmentioning

confidence: 99%

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Nanobubbles at Hydrophilic Particle–Water Interfaces

Pan

Zhang

et al. 2016

Langmuir

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ABSTRACT:The puzzling persistence of nanobubbles breaks Laplace's law for bubbles, which is of great interest for promising applications in surface processing, H 2 and CO 2 storage, water treatment, and drug delivery. So far, nanobubbles have mostly been reported on hydrophobic planar substrates with atomic flatness. It remains a challenge to quantify nanobubbles on rough and irregular surfaces because of the lack of a characterization technique that can detect both the nanobubble morphology and chemical composition inside individual nanobubblelike objects. Here, by using synchrotron-based scanning transmission soft X-ray microscopy (STXM) with nanometer resolution, we discern nanoscopic gas bubbles of >25 nm with direct in situ proof of O 2 inside the nanobubbles at a hydrophilic particle−water interface under ambient conditions. We find a stable cloud of O 2 nanobubbles at the diatomite particle−water interface hours after oxygen aeration and temperature variation. The in situ technique may be useful for many surface nanobubble-related studies such as material preparation and property manipulation, phase equilibrium, nucleation kinetics, and relationships with chemical composition within the confined nanoscale space. The oxygen nanobubble clouds may be important in modifying particle−water interfaces and offering breakthrough technologies for oxygen delivery in sediment and/or deep water environments.

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Section: ■ Methodsmentioning

confidence: 99%

“…Surface nanobubbles were generated using temperature variation. 14,27 The stability of O 2 nanobubbles on the hydrophilic particles was investigated hours after oxygen aeration.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanobubbles at Hydrophilic Particle–Water Interfaces

Pan

Zhang

et al. 2016

Langmuir

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“…Research advances in various physical aspects of surface nanobubbles in the past decade include methods of nanobubble generation based on solvent exchange, 20,31−33 temperature gradients, 21,34 the plasmonic effect, 35 and water electrolysis. 36−40 Alcohol−water exchange is proven to be an effective method that can generate a large number of air nanobubbles with high repeatability.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Induced Interfacial Nanobubbles

2016

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A new method for generating nanobubbles via microwave irradiation was verified and quantified. AFM measurement showed that nanobubbles with diameters ranging from 200 to 600 nm were generated at a water-HOPG surface by applying microwave radiation to aqueous solutions with 9.0−30.0 mg/L dissolved oxygen. Graphite displays strong microwave absorption and transmits high thermal energy to the surface. Because of the high dielectric constant (20°C, 80 F/m) and dielectric loss factor, water molecules have a strong ability to absorb microwave radiation. The thermal and nonthermal effects of microwave radiation made contributions to decreasing the gas solubility, thus facilitating nanobubble nucleation. The yield of nanobubbles increased about 10-fold when the irradiation time increased from 60 to 120 s at 200 W of microwave radiation. The nanobubble density increased from 0.8 to 15 μm −2 by improving the working power from 200 to 600 W. An apparent improvement in nanobubbles yield was obtained between 300 and 400 W, and the resulting temperature was 34−52°C. When the initial dissolved oxygen increased from 11.3 to 30.0 mg/L, the density of nanobubbles increased from 1.2 to 13 μm . The generation of nanobubbles could be well controlled by adjusting the gas concentration, microwave power, or irradiation time. The method may be valuable in preparing surface nanobubbles quickly and conveniently for various applications, such as catalysis, hypoxia/anoxia remediation, and templates for preparing nanoscale materials.

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“…They are surprisingly stable [10,[12][13][14], surviving orders of magnitude longer than the classical diffusive life time. Since their recent discovery, several key observations have been made regarding the 'ideal' conditions for nucleation [15][16][17]. These include the (almost [18,19]) uniqueness for the formation in water, or in solutions containing at least some part water.…”

Section: Introductionmentioning

confidence: 99%

Surface Nanobubbles as a Function of Gas Type

Limbeek

Seddon

2011

Langmuir

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We experimentally investigate the nucleation of surface nanobubbles on PFDTS-coated silicon as a function of the specific gas dissolved in the water. In each case we restrict ourselves to equilibrium conditions (c = 100 %, T liquid = T substrate ). Not only is nanobubble nucleation a strong function of gas type, but there also exists an optimal system temperature of ∼ 35 − 40 o C where nucleation is maximized, which is weakly dependent on gas type. We also find that contact angle is a function of nanobubble radius of curvature for all gas types investigated. Fitting this data allows us to describe a line tension which is dependent on the type of gas, indicating that the nanobubbles are sat on top of adsorbed gas molecules. The average line tension was τ ∼ −0.8nN.

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Characterization of Nanobubbles on Hydrophobic Surfaces in Water

Cited by 223 publications

References 16 publications

Nanobubbles at Hydrophilic Particle–Water Interfaces

Nanobubbles at Hydrophilic Particle–Water Interfaces

Microwave-Induced Interfacial Nanobubbles

Surface Nanobubbles as a Function of Gas Type

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