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Uchida T, Liu S, Enari M, et al. Effect of NaCl on the Lifetime of Micro- and Nanobubbles. Nanomaterials (Basel). 2016;6(2)doi: 10.3390/nano6020031.
Uchida, T., Liu, S., Enari, M., Oshita, S., Yamazaki, K., & Gohara, K. (2016). Effect of NaCl on the Lifetime of Micro- and Nanobubbles. Nanomaterials (Basel, Switzerland), 6(2), . https://doi.org/10.3390/nano6020031
Uchida, Tsutomu, et al. "Effect of NaCl on the Lifetime of Micro- and Nanobubbles." Nanomaterials (Basel, Switzerland) vol. 6,2 (2016). doi: https://doi.org/10.3390/nano6020031
Uchida T, Liu S, Enari M, Oshita S, Yamazaki K, Gohara K. Effect of NaCl on the Lifetime of Micro- and Nanobubbles. Nanomaterials (Basel). 2016 Feb 05;6(2). doi: 10.3390/nano6020031. PMID: 28344288; PMCID: PMC5302484.
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Nanomaterials (Basel). 2016 Feb 05;6(2). doi: 10.3390/nano6020031.

Effect of NaCl on the Lifetime of Micro- and Nanobubbles.

Nanomaterials (Basel, Switzerland)

Tsutomu Uchida, Shu Liu, Masatoshi Enari, Seiichi Oshita, Kenji Yamazaki, Kazutoshi Gohara

Affiliations

  1. Division of Applied Physics, Faculty of Engineering, Hokkaido University, N13 W8 Kita-ku, Sapporo, Hokkaido 060-8628, Japan. [email protected].
  2. Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan. [email protected].
  3. Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan. [email protected].
  4. Graduate School of Agricultural & Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan. [email protected].
  5. Division of Applied Physics, Faculty of Engineering, Hokkaido University, N13 W8 Kita-ku, Sapporo, Hokkaido 060-8628, Japan. [email protected].
  6. Division of Applied Physics, Faculty of Engineering, Hokkaido University, N13 W8 Kita-ku, Sapporo, Hokkaido 060-8628, Japan. [email protected].

PMID: 28344288 PMCID: PMC5302484 DOI: 10.3390/nano6020031

Abstract

Micro- and nanobubbles (MNBs) are potentially useful for industrial applications such as the purification of wastewater and the promotion of physiological activities of living organisms. To develop such applications, we should understand their properties and behavior, such as their lifetime and their number density in solution. In the present study, we observed oxygen MNBs distributed in an electrolyte (NaCl) solution using a transmission electron microscope to analyze samples made with the freeze-fracture replica method. We found that MNBs in a 100 mM NaCl solution remain for at least 1 week, but at higher concentrations decay more quickly. To better understand their lifetimes, we compared measurements of the solution's dissolved oxygen concentration and the ζ-potential of the MNBs. Our detailed observations of transmission electron microscopy (TEM) images allows us to conclude that low concentrations of NaCl stabilize MNBs due to the ion shielding effect. However, higher concentrations accelerate their disappearance by reducing the repulsive force between MNBs.

Keywords: diffusive shielding; freeze-fracture replica; ionic shielding; microbubble; nanobubble; transmission electron microscope; ζ-potential

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