Physics of Fluids - Publications

Entrapment of interfacial nanobubbles on nano-structured surfaces

arΧiv
Soft Matter 13, 5381–5388 (2017)
See also cover of that article: Soft Matter

Authors

	Yuliang Wang
	Xiaolai Li
	Shuai Ren
	Hadush Tedros Alem
	Lijun Yang
	Detlef Lohse

BibTeΧ

@Article{C7SM01205E,
author ="Wang, Yuliang and Li, Xiaolai and Ren, Shuai and Tedros Alem, Hadush and Yang, Lijun and Lohse, Detlef",
title  ="Entrapment of interfacial nanobubbles on nano-structured surfaces",
journal  ="Soft Matter",
year  ="2017",
volume  ="13",
issue  ="32",
pages  ="5381-5388",
publisher  ="The Royal Society of Chemistry",
doi  ="10.1039/C7SM01205E",
url  ="http://dx.doi.org/10.1039/C7SM01205E",
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."}