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Related Experiment Video

Updated: May 28, 2026

Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles

Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles

Published on: August 16, 2012

Synthesis of Alumina Nanoparticles Using Plasma-Induced Microbubbles.

Yuma Minami¹, Yuudai Aokusa¹, Nobutoshi Ota¹

¹Department of Mechanical Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

|May 27, 2026

Summary

This summary is machine-generated.

Researchers precisely controlled the crystal phase of alumina nanoparticles by adjusting plasma microbubble conditions. Modulating the pulse off time in plasma synthesis allows selective formation of alpha-alumina or gamma-alumina nanoparticles.

Keywords:

alumina nanoparticle phase control plasma-induced microbubbles

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Last Updated: May 28, 2026

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Area of Science:

Materials Science
Nanotechnology
Plasma Physics

Background:

Plasma-induced microbubbles offer a promising environment for nanomaterial synthesis.
Achieving precise control over the crystalline phase of synthesized nanoparticles remains a significant challenge.

Purpose of the Study:

To investigate the selective synthesis of alpha-alumina and gamma-alumina nanoparticles.
To demonstrate the regulation of the thermal environment within plasma-induced microbubbles through pulse off time modulation.
To establish a method for controlling nanoparticle crystal phase and size.

Main Methods:

Utilizing plasma-induced microbubbles for nanoparticle synthesis.
Modulating the pulse off time of the plasma discharge.
Employing optical emission spectroscopy to analyze the thermal environment (electron temperature).

Main Results:

Shorter pulse off times maintained high electron temperatures, promoting heat accumulation and the formation of the stable alpha-alumina phase.
Longer pulse off times resulted in insufficient heating and rapid quenching, leading to the formation of the metastable gamma-alumina phase.
Demonstrated selective synthesis of alumina nanoparticles with controlled crystal phases (alpha and gamma).

Conclusions:

The thermal energy within plasma-induced microbubbles can be effectively regulated by controlling the pulse off time.
This control enables the selective synthesis of alumina nanoparticles with desired crystal phases and sizes.
The findings provide a pathway for tailored nanoparticle fabrication using plasma-based methods.