Research progress on bulk nanobubbles--颗粒学报PARTICUOLOGY

Sun, L., Zhang, F., Guo, X., Qiao, Z., Zhu, Y., Jin, N., . . . Yang, W. (2022). Research progress on bulk nanobubbles. Particuology, 60, 99-106. https://doi.org/10.1016/j.partic.2021.03.003

Research progress on bulk nanobubbles

Le Sun ^a, Fenghua Zhang ^a *, Xiaoming Guo ^b, Zhengming Qiao ^b, Yi Zhu ^b, Nuo Jin ^a, Yan Cui ^a, Weimin Yang ^a

a College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
b Preparation Office of Zhangzhou Base of National Marine Technology Center, Xiamen 361007, China

10.1016/j.partic.2021.03.003

Volume 60, January 2022, Pages 99-106

Received 18 December 2020, Revised 10 March 2021, Accepted 12 March 2021, Available online 20 April 2021, Version of Record 23 October 2021.

E-mail: zhangfenghua@mail.buct.edu.cn

Highlights

• Nanobubbles has been used in wide range of applications.

• Huge gap is found in lifetime of nanobubbles’ between theory and experiments.

• The reason of nanobubble’s ultra-long stablity is still unclear.

• Distinguishing nanobubbles from nano scale pollutants is crucial.

• Exploring the underlying mechanism benefits development of the applications.

Abstract

There are still fundamental problems lying in the basic research of bulk nanobubbles. Are the bulk nanobubbles reported in the literature nano scale bubbles or contaminants in fact? At present, there is not yet sufficient experimental evidence to show that the bulk nanoparticles are only gas bubbles but not other nano scale contaminants. If they are indeed nanobubbles, what causes the bulk nanobubbles observed in the literature to be much more stable than being predicted by the Epstein-Plesset theory?

This paper firstly discusses the contradiction between the traditional theory prediction and the observed lifetime of the bulk nanobubbles, and then discusses whether the so-called nanobubbles are gas aggregates. We review the existing typical models, and the influence of different conditions on the stability of bulk nanobubbles, for paving the road to a clear understanding of the stability mechanism of bulk nanobubbles. In addition, the representative production methods and characterization methods of bulk nanobubbles are discussed in order to offer some guidance to their wide range of commercial applications.

Graphical abstract

Keywords

Bulk nanobubbles; Nano scale contaminants; Typical model; Stability mechanism

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