On the clustering of bulk nanobubbles and their colloidal stability

Anand Jadhav, Mostafa Barigou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Pages (from-to)816-824
Number of pages9
JournalJournal of Colloid and Interface Science
Volume601
Early online date27 May 2021
DOIs
Publication statusPublished - Nov 2021

Bibliographical note

Funding Information:
This work was supported by EPSRC Grant EP/L025108/1 .

Publisher Copyright:
© 2021 Elsevier Inc.

Keywords

  • Bulk nanobubble clusters
  • Bulk nanobubbles
  • Colloidal stability
  • DLVO theory
  • Salt effects
  • pH effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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