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  • The mechanism for laser-based excitation of nanobubbles [Elektronski vir]
    Jelenčič, Miha ...
    Nanobubbles have found increasing use in various applications, though the physical background of their formation and interactions remains largely unresearched as studies primarily focus on the ... benefits of nanobubbles rather than the governing principles. In this work, the principles of laser-induced nanobubble formation in pure water and in water with added gold nanoparticles are studied. Firstly, probability of nanobubble formation as a function of water sample purity was examined, while for solutions with added nanoparticles the number of excited nanobubbles was compared with the expected average number of nanoparticles within the excitation volume. Secondly, the relation between laser fluence at different wavelengths and the number of generated nanobubbles was investigated. Thirdly, measurements of nanobubble lifetime were conducted. In pure water samples, the measured long lifetimes were 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, but also that gold nanoparticles do not offer significant means for a stabilization mechanism increasing the lifetime.
    Vir: 12th International Cavitation Symposium – CAV2024, 2-5 June 2024, Chania, Greece [Elektronski vir] (str. [1-5])
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2024
    Jezik - angleški
    COBISS.SI-ID - 214183427

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