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

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Published on: May 9, 2021

Dynamic forces between bubbles and surfaces and hydrodynamic boundary conditions.

Ofer Manor¹, Ivan U Vakarelski, Geoffrey W Stevens

¹Particulate Fluids Processing Centre, University of Melbourne, Parkville, Victoria 3010, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 24, 2008

Summary

This summary is machine-generated.

Researchers used atomic force microscopy to study dynamic forces in thin aqueous films. They found that surface contaminants, not just surfactants, significantly affect fluid behavior at the nanoscale.

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Published on: September 9, 2022

Area of Science:

Surface Science
Fluid Dynamics
Nanotechnology

Background:

Characterizing dynamic forces in nanoscale aqueous films is crucial for understanding interfacial phenomena.
Hydrodynamic drainage and electrical double layer interactions are key forces at play.
The air/water interface's mobility, influenced by surfactants or electrolytes, affects these dynamics.

Purpose of the Study:

To characterize dynamic forces in nanometer-thick aqueous films using atomic force microscopy (AFM).
To investigate the influence of hydrodynamic drainage and electrical double layer interactions.
To understand the role of the air/water interface's mobility on these forces.

Main Methods:

Utilized an atomic force microscope (AFM) with a bubble attached to the cantilever.
Drove the bubble towards/away from a mica surface across an aqueous film.
Developed and applied a model incorporating convection and diffusion of trace surface contaminants.

Main Results:

Observed varying hydrodynamic responses of the air/water interface, from no-slip (surfactants) to partially mobile (electrolytes).
The developed model accurately accounts for the observed interfacial dynamics.
The contaminant model predicts different interfacial dynamics compared to the classical Navier slip model.

Conclusions:

Trace surface contaminants significantly influence nanoscale hydrodynamic behavior in aqueous films.
A model including contaminant transport provides a more comprehensive explanation than traditional slip models.
This work offers insights into interfacial dynamics relevant to nanotechnology and surface science.