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Clean production and characterization of nanobubbles using laser energy depositionRosselló, Juan Manuel ; Ohl, Claus-DieterWe 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.Source: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 94, Mar. 2023, str. 1-12)Type of material - article, component part ; adult, seriousPublish date - 2023Language - englishCOBISS.SI-ID - 176654083
Author
Rosselló, Juan Manuel |
Ohl, Claus-Dieter
Topics
laser-induced bubbles |
nanobubbles |
shockwave |
gas diffusion |
shadowgraph microscopy |
nanomehurčki |
laserji |
kavitacija
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Rosselló, Juan Manuel | 57808 |
Ohl, Claus-Dieter |
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