A Henry's law method for generating bulk nanobubbles

Gianluca Ferraro, Anand Jadhav, Mostafa Barigou

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
83 Downloads (Pure)

Abstract

A new technique for generating bulk nanobubble suspensions has been developed based on Henry's law which states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. This principle which forms the basis of vacuum degasification has been exploited here to produce stable bulk nanobubbles in excess of 109 bubble mL-1 in pure water, through successive expansion/compression strokes inside a sealed syringe. We provide evidence that the observed nano-entities must be gas-filled nanobubbles by showing that: (i) they cannot be attributed to organic or inorganic impurities; (ii) they disappear gradually over time whilst their mean size remains unchanged; (iii) their number density depends on the concentration of dissolved gas in water and its solubility; and (iv) added sparging of gas enhances process yield. We study the properties of these nanobubbles including the effects of type of dissolved gas, water pH and the presence of different valence salts on their number density and stability. Given the potential of the technique for large scale production of nanobubble suspensions, we describe a successfully tested automated model and outline the basis for process scale-up. This journal is

Original languageEnglish
Pages (from-to)15869 – 15879
Number of pages11
JournalNanoscale
Volume12
Issue number29
Early online date22 Jul 2020
DOIs
Publication statusPublished - 7 Aug 2020

ASJC Scopus subject areas

  • Materials Science(all)

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