Time-resolved dynamics and characteristics of laser-generated nanobubbles in a colloidal suspension

Miha Jelenčič (Author), Uroš Orthaber (Author), Jaka Mur (Author), Rok Petkovšek (Author)

Abstract

Hypothesis: Colloidal suspensions act as stabilizer agents against dissolution of bubbles, as well as interaction points for laser generation of nanobubbles. Gold nanoparticles were chosen as a well understood model colloid to study characteristics of laser-generated nanobubbles in a colloidal suspension. We hypothesise that the time-resolved dynamics of nanobubbles in existing works do not yet reflect the complete nanobubble dynamics and properties. Advancement in the field is possible by improving the understanding of interfacial phenomena, both interaction between colloids and laser light and nanobubbles on colloids. Experiments and simulations: We developed a method for analysing the lifecycle of nanobubbles starting with their laser-induced generation, following through with their initial oscillation until their dissolution using contactless optical methods. The work combines laser-generation of nanobubbles, their controlled expansion with isolated negative pressure shock waves, and Gilmore-model supported radius reconstruction. Findings: This experimental approach enabled us to reconstruct initial nanobubble sizes right after generation and their time evolution through the initial oscillation, recognizing the physical mechanisms behind the measured nanobubble properties. Threshold for nanobubble generation as well as nanobubble dissolution time as a function of colloid size was determined, and the efficiency of nanobubble generation with respect to the laser light intensity was measured. We demonstrate the capability to measure both the initial nanosecond scale nanobubble dynamics after laser-generation and their later dissolution on micro- to millisecond scales with a single method. The study advances the field of laser-generated nanobubbles with further implications for controlled nanobubble seeding in various environments.

Keywords

nanobubbles;laser breakdown;shock wave;laser illumination;colloidal suspension;

Data

Language:	English
Year of publishing:	2025
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	621.375.826:535
COBISS:	238900483
ISSN:	1095-7103
Views:	166
Downloads:	28
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	nanomehurčki;laserski preboj;udarni val;lasersko osvetljevanje;koloidna suspenzija;
Type (COBISS):	Article
Pages:	10 str.
Volume:	ǂVol. ǂ967
Issue:	[article no.] 137977
Chronology:	2025
DOI:	10.1016/j.jcis.2025.137977
ID:	26558452