Evidence of laser-induced nanobubble formation mechanism in water

Jelenčič, Miha (author), Orthaber, Uroš (author), Mur, Jaka (author), Petelin, Jaka (author), Petkovšek, Rok (author)

Principles of laser-induced nanobubble formation in water are studied and presented. Nanobubbles were generated by laser light at intensities below threshold for laser-induced breakdown and subsequently expanded by a rarefaction wave to facilitate their observation and analysis. Different methods were used to study nanobubble formation and characteristics. Firstly, probability of nanobubble formation as a function of water sample purity was examined. Secondly, relation between laser fluence at different wavelengths and the number of generated nanobubbles was investigated. Thirdly, measurements of nanobubble lifetime were conducted indicating a contradiction to the Epstein-Plesset equation-based prediction of free bubble dissociation. Accumulated evidence suggests that the presence of physical impurities is a prerequisite for nanobubble formation. Consequently, a lack of impurities results in the absence of nanobubbles in contrast to assumptions by existing studies. The findings presented in this paper provide new insights into the fundamental properties of laser-induced nanobubbles in water.

• Language: English
• Keywords: laser-induced bubbles, nanobubbles, bubble nucleation, shock waves, Epstein-Plesset equation
• 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: 9 str.
• Numbering: Vol. 99, art. 106537
• PID: 20.500.12556/RUL-148207
• UDC: 532.528
• ISSN on article: 1350-4177
• DOI: 10.1016/j.ultsonch.2023.106537
• COBISS.SI-ID: 160337923
• Publication date in RUL: 01.08.2023

Record is a part of a journal

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

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: lasersko inducirani mehurčki, nanomehurčki, nukleacija mehurčkov, udarni valovi, Epstein-Plessetova enačba

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0270
• Name: Proizvodni sistemi, laserske tehnologije in spajanje materialov

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-3057
• Name: Kontrolirano generiranje mikromehurčkov in raziskave njihove fizike za uporabo v kemiji, biologiji in medicini