Size control of nanobubbles generated from Shirasu-porous-glass (SPG) membranes

Masato Kukizaki, Masahiro Goto

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105 Citations (Scopus)


We recently discovered that monodispersed nanobubbles/microbubbles could be generated from Shirasu-porous-glass (SPG) membranes with uniform pores in a system composed of dispersed gaseous and continuous water phases containing a surfactant. In the present study, size control of the nanobubbles generated was examined using SPG membranes with less than submicron-size pores. Air was pressurized into a sodium dodecyl sulfate (SDS) solution ranging from 0.05 to 0.5 wt.% flowing through a SPG membrane with a transmembrane/bubble point pressure ratio of 1.1-2.0. Under these conditions, monodispersed nanobubbles with a mean bubble diameter of 360-720 nm were stably produced from membranes with mean pore diameters of 43-85 nm. The mean bubble diameter was shown to be 8.6 times larger than the mean pore diameter; therefore, the nanobubble diameter could be controlled by the membrane pore size. Mean bubble diameter was barely affected by a flow velocity of 0.5-3.7 m s-1 or by the surface tension between air and 0.05-0.5 wt.% SDS solution.

Original languageEnglish
Pages (from-to)386-396
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - Sep 15 2006

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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