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• W4297990764 endingPage "100407" @default.
• W4297990764 startingPage "100407" @default.
• W4297990764 abstract "Generation of ultra high frequency acoustic waves in water is key to nano resolution sensing, acoustic imaging and theranostics. In this context water immersed carbon nanotubes (CNTs) may act as an ideal optoacoustic source, due to their nanometric radial dimensions, peculiar thermal properties and broad band optical absorption. The generation mechanism of acoustic waves in water, upon excitation of both a single-wall (SW) and a multi-wall (MW) CNT with laser pulses of temporal width ranging from 5 ns down to ps, is theoretically investigated via a multiscale approach. We show that, depending on the combination of CNT size and laser pulse duration, the CNT can act as a thermophone or a mechanophone. As a thermophone, the CNT acts as a nanoheater for the surrounding water, which, upon thermal expansion, launches the pressure wave. As a mechanophone, the CNT acts as a nanopiston, its thermal expansion directly triggering the pressure wave in water. Activation of the mechanophone effect is sought to trigger few nanometers wavelength sound waves in water, matching the CNT acoustic frequencies. This is at variance with respect to the commonly addressed case of water-immersed single metallic nano-objects excited with ns laser pulses, where only the thermophone effect significantly contributes. The present findings might be of impact in fields ranging from nanoscale non-destructive testing to water dynamics at the meso to nanoscale." @default.
• W4297990764 created "2022-10-01" @default.
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• W4297990764 date "2022-12-01" @default.
• W4297990764 modified "2023-10-17" @default.
• W4297990764 title "Ultrafast nano generation of acoustic waves in water via a single carbon nanotube" @default.
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• W4297990764 doi "https://doi.org/10.1016/j.pacs.2022.100407" @default.
• W4297990764 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36263352" @default.
• W4297990764 hasPublicationYear "2022" @default.
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