Monodispersed Nano-Bubbles Generated from Porous Glass Membrane and Bubble Size Control

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  • KUKIZAKI Masato
    Material Development Department, Miyazaki Prefectural Industrial Technology Center
  • NAKASHIMA Tadao
    Miyazaki Prefectural Industrial Support Foundation
  • SONG Jun
    Transdisciplinary Fluid Integration Research Center, Tohoku University
  • KOHAMA Yasuaki
    Transdisciplinary Fluid Integration Research Center, Tohoku University

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Other Title
  • 多孔質ガラス膜による単分散状ナノバブルの生成と気泡径制御
  • タコウシツ ガラス マク ニ ヨル タンブンサンジョウ ナノバブル ノ セイセイ ト キホウケイ セイギョ

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The authors found that monodispersed bubbles with a mean diameter of less than 1 μm (monodispersed nano-bubbles) were generated from a porous glass membrane with uniform size-controlled pores. The size of the bubbles generated could be controlled by varying the pore size of the membrane used. When air was permeated through a hydrophilic tubular membrane at a right-angle to the flow of pure water containing sodium dodecyl sulfate (SDS) of 1.7 mol·m-3 as a surfactant, and then dispersed into the water phase flowing on the inner side of the membrane, monodispersed bubbles were generated in the pressure region that exceeded the bubble point pressure. Under such conditions, nano-bubbles with a mean diameter of 0.720 μm were generated from a membrane with a mean pore diameter of 0.084 μm. The mean diameter of the bubbles generated was proportional to the mean pore diameter of the membrane used. By contrast, bubbles with a broad size distribution were generated from a hydrophobic membrane, and bubble point pressure was not observed. When the SDS concentration was lower than 1.7 mol·m-3, polydispersed bubbles were generated from even the hydrophilic membrane.

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