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

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Published on: June 12, 2021

Unveiling ignis fatuus: Microlightning between microbubbles.

Yu Xia^1,2, Yifan Meng^2,3, Jianbo Shi^4,5

¹Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances, School of Environment and Health, Jianghan University, Wuhan 430056, China.

Proceedings of the National Academy of Sciences of the United States of America

|September 29, 2025

Summary

This summary is machine-generated.

Ghostly will-o-the-wisps are explained by "microlightning," spontaneous electrical discharges between methane bubbles in water. This discovery reveals a natural ignition mechanism for marshland flames and other redox reactions.

Keywords:

interfacial chemistry methane microbubbles microlightning will-o’-the-wisps

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Area of Science:

Environmental Science
Chemistry
Physics

Background:

Will-o'-the-wisps (ignis fatuus) are unexplained luminous phenomena in marshlands.
They have been traditionally attributed to methane cool flames but lacked a clear ignition mechanism.

Purpose of the Study:

To investigate the scientific basis of will-o'-the-wisps.
To identify the ignition mechanism for methane oxidation in natural environments.

Main Methods:

High-speed optical imaging of methane microbubbles in water.
Analysis of spontaneous electrical discharges (microlightning) between charged bubbles.
Investigation of nonthermal oxidation of methane initiated by these discharges.

Main Results:

Demonstrated spontaneous electrical discharges ('microlightning') between rising methane microbubbles.
Observed brief flashes caused by strong electric fields at gas-liquid interfaces.
Confirmed initiation of nonthermal methane oxidation, producing luminescence and heat.

Conclusions:

Microlightning provides a scientific explanation for ignis fatuus.
Electrified interfaces can drive redox reactions in nature without external ignition.
This mechanism applies to various natural environments with electrified interfaces.