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Issue 32, 2017

Entrapment of interfacial nanobubbles on nano-structured surfaces

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Abstract

Spherical-cap-shaped interfacial nanobubbles (NBs) forming on hydrophobic surfaces in aqueous solutions have extensively been studied both from a fundamental point of view and due to their relevance for various practical applications. In this study, the nucleation mechanism of spontaneously generated NBs at solid–liquid interfaces of immersed nanostructured hydrophobic surfaces is studied. Depending on the size and density of the surface nanostructures, NBs with different size and density were reproducibly and deterministically obtained. A two-step process can explain the NB nucleation, based on the crevice model, i.e., entrapped air pockets in surface cavities which grow by diffusion. The results show direct evidence for the spontaneous formation of NBs on a surface at its immersion. Next, the influence of size and shape of the nanostructures on the nucleated NBs are revealed. In particular, on non-circular nanopits we obtain NBs with a non-circular footprint, demonstrating the strong pinning forces at the three-phase contact line.

Graphical abstract: Entrapment of interfacial nanobubbles on nano-structured surfaces

Supplementary files

Article information


Submitted
18 Jun 2017
Accepted
18 Jul 2017
First published
18 Jul 2017

Soft Matter, 2017,13, 5381-5388
Article type
Paper

Entrapment of interfacial nanobubbles on nano-structured surfaces

Y. Wang, X. Li, S. Ren, H. Tedros Alem, L. Yang and D. Lohse, Soft Matter, 2017, 13, 5381 DOI: 10.1039/C7SM01205E

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