Nanobubbles on solid surface imaged by atomic force microscopy

Lou, Shitao; Ouyang, Zhen; Zhang, Yi; Li, Xiaojun; Hu, Jun; Li, Minqian; Yang, Fujia

doi:10.1116/1.1289925

Cited by 458 publications

(520 citation statements)

References 18 publications

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“…In deaerated water, i.e., water in which dissolved gases have been taken out as much as possible, the formation of nanobubbles is very much reduced, and the force is of shorter range [507,511,514,537,539,540]. Nanobubbles on hydrophobic surface could be imaged with the AFM in tapping mode [541][542][543][544][545] (Fig. 23).…”

Section: Hydrophobic Attractionmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

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Section: Hydrophobic Attractionmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

View full text Add to dashboard Cite

“…The seminal work was performed by Parker and Attard 4 in 1994, who observed long-range attractive forces using a surface force apparatus and attributed this to the existence of nano-scale gas bubbles at the interface. Real-space images of nanobubbles had to wait until advancements in atomic force microscopy (AFM) immersed in liquids resulted in the observation of soft spherical cap shaped features by Lou et al 5 and Ishida et al 6 in 2000. Unfortunately, the AFM tip disturbs these soft features and properly imaging nanobubbles is not a trivial task [7][8][9][10] .…”

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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“…The presence of the hydrophobic surface leads to the formation of spherical cap-like bubbles at the solid-liquid interface, called "surface nanobubbles". Over the years AFM techniques have been the most popular method in studying these surface nanobubbles [1][2][3][4][5]. Depending on the conditions that lead to their formation, different behaviors of the nanobubbles have been found by these studies: e.g., their spherical cap-like shape and chances of deviation from that shape [6][7][8], merging of two adjacently located nanobubbles [6,9], disappearance of nanobubbles in case the water is degassed [10], possible reappearances by exchange of solvents [7,[11][12][13][14][15] or increase of temperature [11], or electrolysis [9,16] etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of impurities in description of surface nanobubbles

Das

Snoeijer²,

Lohse³

2010

Phys. Rev. E

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Surface nanobubbles emerging at solid-liquid interfaces of submerged hydrophobic surfaces show extreme stability and very small (gas-side) contact angles. In a recent study Ducker (W. A. Ducker, Langmuir 25, 8907 (2009).) conjectured that these effects may arise from the presence of impurities at the air-water interface of the nanobubbles. In this paper we present a quantitative analysis of this hypothesis by estimating the dependence of the contact angle and the Laplace pressure on the fraction of impurity coverage at the liquid-gas interface. We first develop a general analytical framework to estimate the effect of impurities (ionic or non-ionic) in lowering the surface tension of a given air-water interface. We then employ this model to show that the (gas-side) contact angle and the Laplace pressure across the nanobubbles indeed decrease considerably with an increase in the fractional coverage of the impurities, though still not sufficiently small to account for the observed surface nanobubble stability. The proposed model also suggests the dependencies of the Laplace pressure and the contact angle on the type of impurity.3

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Nanobubbles on solid surface imaged by atomic force microscopy

Cited by 458 publications

References 18 publications

Force measurements with the atomic force microscope: Technique, interpretation and applications

Force measurements with the atomic force microscope: Technique, interpretation and applications

Exposing nanobubble-like objects to a degassed environment

Effect of impurities in description of surface nanobubbles

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