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Excess Pressure Inside a Drop and a Bubble

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.

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The pressure fluctuation depends on the difference in displacements between the successive points in the...

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Related Experiment Video

Updated: Jul 3, 2026

Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis

Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis

Published on: September 5, 2020

Near-field acoustic imaging with a caged bubble.

Dorian Bouchet¹, Olivier Stephan¹, Benjamin Dollet¹

¹Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.

Nature Communications

|November 28, 2024

Summary

This summary is machine-generated.

Researchers developed a novel method using a caged bubble for high-resolution acoustic microscopy. This technique enables near-field imaging of complex structures with unprecedented detail, advancing acoustic imaging capabilities.

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Last Updated: Jul 3, 2026

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Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release

Published on: June 12, 2021

Area of Science:

Acoustics
Materials Science
Microscopy

Background:

Bubbles are vital in diverse fields like ultrasound imaging and studying natural phenomena.
Acoustically, bubbles are resonant scatterers with large scattering cross-sections and sub-wavelength sizes.
Probing single-bubble environmental interactions is difficult due to manipulation challenges.

Purpose of the Study:

To develop a method for probing single-bubble environmental interactions.
To demonstrate near-field imaging with sub-wavelength resolution using a single bubble.
To explore the potential of caged bubbles for low-cost acoustic microscopy.

Main Methods:

Confining a cubic bubble within a 3D-printed cage.
Utilizing the caged bubble as a local probe for acoustic scanning.
Performing scanning near-field acoustic microscopy (SNAM).

Main Results:

Demonstrated near-field imaging of complex structures.
Achieved a resolution two orders of magnitude smaller than the acoustic wavelength.
Successfully used a single resonating bubble as an acoustic probe.

Conclusions:

The caged bubble approach enables high-resolution acoustic microscopy.
This technique offers a new way to study bubble-environment interactions at the microscale.
The method holds promise for developing affordable acoustic microscopes.