Clean production and characterization of nanobubbles using laser energy deposition

Rosselló, Juan Manuel (author), Ohl, Claus-Dieter (author)

We have demonstrated the production of laser bulk nanobubbles (BNB) with ambient radii typically below 500 nm. The gaseous nature of the nanometric objects was confirmed by a focused acoustic pulse that expands the gas cavities to a size that can be visualized with optical microscopy. The BNBs were produced on demand by a collimated high-energy laser pulse in a “clean” way, meaning that no solid particles or drops were introduced in the sample by the generation method. This is a clear advantage relative to the other standard BNB production techniques. Accordingly, the role of nanometric particles in laser bubble production is discussed. The characteristics of the nanobubbles were evaluated with two alternative methods. The first one measures the response of the BNBs to acoustic pulses of increasing amplitude to estimate their rest radius through the calculation of the dynamics Blake threshold. The second one is based on the bubble dissolution dynamics and the correlation of the bubble’s lifetime with its initial size. The high reproducibility of the present system in combination with automated data acquisition and analysis constitutes a sound tool for studying the effects of the liquid and gas properties on the stability of the BNBs solution.

• Language: English
• Keywords: laser-induced bubbles, nanobubbles, shockwave, gas diffusion, shadowgraph microscopy
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 12 str.
• Numbering: Vol. 94
• PID: 20.500.12556/RUL-168885
• UDC: 532.528
• ISSN on article: 1350-4177
• COBISS.SI-ID: 176654083
• Publication date in RUL: 05.05.2025

Record is a part of a journal

• Title: Ultrasonics sonochemistry
• Shortened title: Ultrason. sonochem.
• Publisher: Butterworth-Heinemann, Elsevier
• ISSN: 1350-4177
• COBISS.SI-ID: 707668

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: nanomehurčki, laserji, kavitacija

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Alexander von Humboldt Foundation

• Funder: EC - European Commission
• Project number: 101064097
• Name: Nanobubbles Stabilization for Cleaning Applications
• Acronym: NASCAP