Micro-/Nano-Bubble Generators

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E:Engineering and Technology".

Deadline for manuscript submissions: closed (28 February 2026) | Viewed by 765

Special Issue Editor


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Guest Editor
Green Processes Center, Shamoon College of Engineering, 8410802 Be’er Sheva, Israel
Interests: micro-/nano-bubbles; wastewater treatment; life cycle assessment (LCA); sustainable engineering; membrane filtration

Special Issue Information

Dear Colleagues,

The generation and application of micro- and nano-bubbles have attracted growing attention in recent years, particularly in the context of water treatment, chemical processing, and green engineering. This Special Issue of Micromachines aims to highlight the latest advancements in micro-/nano-bubble generation technologies and their integration into sustainable and efficient processes. We invite original research and review articles that explore novel bubble generator designs, theoretical models, experimental investigations, and real-world applications. Topics of interest include, but are not limited to, bubble-enhanced mass transfer, membrane filtration, advanced oxidation processes, and the role of microbubbles in life cycle engineering.

As a researcher involved in the development of innovative bubble generation systems and their environmental applications, I look forward to curating contributions that bridge engineering, sustainability, and applied science. We welcome submissions from diverse disciplines and encourage interdisciplinary approaches that can inspire new collaborations and drive forward the field of micro-/nano-bubble technology.

Prof. Dr. Dorith Tavor
Guest Editor

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Keywords

  • microbubbles
  • nanobubbles
  • water treatment
  • mass transfer
  • green engineering
  • LCA
  • sustainability
  • biofilms
  • biomedical applications
  • drug delivery
  • bubble dynamics
  • bioreactor
  • microsystem and nanosystem

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Published Papers (1 paper)

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Research

12 pages, 8209 KB  
Article
Size-Dependent Transition from Stable Surface Modes to Symmetric Geometric Cleavage in Ultrasound-Driven Microbubbles
by Ruixiang Yu, Teng Zhang, Lianbin Zhao, Yongcheng Fang, Yongzhen Jin, Zihan Tang, Yumeng Feng, Yuanyuan Li and Hao Wu
Micromachines 2026, 17(3), 304; https://doi.org/10.3390/mi17030304 - 28 Feb 2026
Cited by 1 | Viewed by 449
Abstract
The dynamic evolution of microbubbles under ultrasonic excitation is fundamental to applications ranging from targeted drug delivery to acoustic cleaning. This study employs a synchronous high-speed microscopic imaging system to systematically investigate the size-dependent stability and fragmentation of air microbubbles (R0 [...] Read more.
The dynamic evolution of microbubbles under ultrasonic excitation is fundamental to applications ranging from targeted drug delivery to acoustic cleaning. This study employs a synchronous high-speed microscopic imaging system to systematically investigate the size-dependent stability and fragmentation of air microbubbles (R0 = 25–82.5 μm) in a free field at a driving frequency of 16.6 kHz. Our results demonstrate a clear mechanistic transition from stable radial oscillations to complex surface instabilities and, eventually, deterministic fragmentation. Smaller bubbles (R0 < 55 μm) exhibit long-term stability, transitioning through higher-order surface modes (n = 3 to n = 4) as surface energy accumulates. In contrast, larger bubbles (R0 > 60 μm) undergo violent non-spherical deformations characterized by centripetal necking and high-speed micro-jetting. Notably, we identify an inverse relationship between initial radius and fragmentation onset time, with larger bubbles reaching instability thresholds significantly earlier. Furthermore, a transition from stochastic breakup to bimodal, volume-symmetric splitting was observed as R0 increased, where daughter bubbles reached comparable volumes. These findings provide a theoretical and empirical basis for the controlled generation of monodisperse microbubble clouds, offering significant potential for enhancing the efficacy of ultrasonic contrast agents and therapeutic cavitation. Full article
(This article belongs to the Special Issue Micro-/Nano-Bubble Generators)
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