On the clustering of bulk nanobubbles and their colloidal stability.

Journal of Colloid and Interface Science
Ananda J Jadhav, Mostafa Barigou

Abstract

Bulk nanobubbles which are usually observed in pure water have a mean diameter typically around 100 nm. We use a combination of physical and chemical techniques to prove the hypothesis that the nanoentities observed in pure water are stable clusters of much smaller stable nanobubbles. The stability of bulk nanobubble clusters is affected by factors such as ionic strength or internal energy of the system. We show that bulk nanobubbles on the order of 100 nm exist in a stable cluster form in neutral or basic media, and dissociate into tiny primary nanobubbles on the order of 1 nm in acidic media, or in the presence of small amounts of salt. These new findings suggest that bulk nanobubbles which have a high surface energy unsurprisingly tend to behave in a similar manner to solid nanoparticles in terms of their agglomeration tendency, which is confirmed by the DLVO theory. The results will have important implications for our understanding and interpretation of the behaviour of bulk nanobubbles, in particular their interfacial and colloidal stability.

References

Feb 6, 2016·The Journal of Physical Chemistry. B·Nikolai F BunkinSergey V Gudkov
Jul 28, 2016·Nanoscale·Julien LombardSamy Merabia
Mar 5, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jie QiuJun Hu
Sep 5, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·N NirmalkarM Barigou
Mar 1, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Juan JinNing Gu
Feb 11, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Ananda J Jadhav, Mostafa Barigou
Jun 3, 2020·Soft Matter·Hongguang ZhangXianren Zhang
Jul 23, 2020·Nanoscale·Gianluca FerraroMostafa Barigou

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