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Related Experiment Video

Updated: May 12, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Nanobubbles do not sit alone at the solid-liquid interface.

Hong Peng¹, Marc A Hampton, Anh V Nguyen

¹School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 20, 2013

Summary

This summary is machine-generated.

Gaseous nanobubbles on hydrophobic surfaces are stable due to interfacial gas enrichment (IGE), not charge. Surfactants remove IGE, revealing nanobubble stability mechanisms.

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Last Updated: May 12, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Area of Science:

Surface Science
Colloid and Interface Science
Nanotechnology

Background:

Gaseous nanobubbles at hydrophobic solid-liquid interfaces exhibit debated stability and contact angles.
Understanding nanobubble behavior is crucial for various applications.

Purpose of the Study:

Investigate the forces and interactions at the highly ordered pyrolytic graphite (HOPG)-water interface.
Clarify the role of interfacial gas enrichment (IGE) in nanobubble stability.

Main Methods:

Atomic Force Microscopy (AFM) with silicon-nitride tipped cantilevers.
Probing the HOPG-water interface with and without solvent-exchange.
Force spectroscopy and force mapping techniques.

Main Results:

Solvent-exchange produced non-DLVO forces, indicating no EDL repulsion between nanobubbles and IGE.
Interfacial gas enrichment (IGE) covers areas between nanobubbles, responsible for non-DLVO forces.
IGE and nanobubbles are uncharged; their coexistence suggests dynamic equilibrium and stability.

Conclusions:

Nanobubble stability is attributed to interfacial gas enrichment (IGE), not electrostatic forces.
IGE can be removed by mechanical and chemical action of surfactants (SDS).
Adsorbed surfactant molecules induce EDL repulsion in surfactant solutions.