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Interaction of Bulk Nanobubbles (Ultrafine Bubbles) with a Solid Surface.

Kyuichi Yasui¹, Toru Tuziuti¹, Wataru Kanematsu¹

¹National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 26, 2021

Summary

This study analyzes nanobubble behavior on polymer surfaces. Bulk nanobubbles transform into surface nanobubbles, resolving mysteries in their adsorption and concentration.

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Area of Science:

Colloid and Surface Science
Materials Science
Chemical Engineering

Background:

Experimental data show temporal variations in bulk nanobubble concentrations near polymer materials.
Bulk nanobubbles are thought to adsorb via hydrophobic interactions, overcoming electrostatic repulsion.
Two key discrepancies exist: low surface concentration and slow adsorption rates of nanobubbles on hydrophobic polymers.

Purpose of the Study:

To theoretically analyze experimental results on nanobubble temporal variations.
To explain the low surface concentration and adsorption rates of bulk nanobubbles on polymer surfaces.
To investigate the transformation of bulk nanobubbles into surface nanobubbles.

Main Methods:

Dynamic equilibrium model for bulk nanobubbles partially covered with hydrophobic materials.
Theoretical analysis of hydrophobic and double-layer interactions.
Comparison of experimental data with theoretical estimations.

Main Results:

The dynamic equilibrium model suggests hydrophobic interactions drive nanobubble adsorption.
A proposed transformation of bulk nanobubbles into surface nanobubbles (approx. 1 μm footprint) resolves experimental mysteries.
This transformation explains the observed low surface concentration and adsorption rates.

Conclusions:

The transformation of bulk nanobubbles to surface nanobubbles is a critical factor in their behavior on hydrophobic polymer surfaces.
This phenomenon reconciles discrepancies between theoretical predictions and experimental observations.
Understanding this transformation is key to accurately modeling nanobubble interactions in various applications.