Инновационные технологии ядерной медицины и лучевой диагностики и терапии

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Просмотр Инновационные технологии ядерной медицины и лучевой диагностики и терапии по Автор "Ulyanov, Y."

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    USING FEMTOSECOND LASER RADIATION FOR THE SYNTHESIS OF NANOSTRUCTURED TUNGSTEN PARTICLES
    (НИЯУ МИФИ, 2024) Dianov, S.; Ulyanov, Y.; Abramov, D.
    The aim of the study is to obtain nanoparticles of tungsten and its compounds by laser evaporation of targets in a liquid medium. The significance of this work lies in the creation of a method for synthesizing nanoparticles that allows controlling the properties and dispersion of the obtained nanoparticles in accordance with current requirements. The main feature of laser evaporation using femtosecond laser pulses is the combined interaction of processes such as laser radiation absorption, nanoparticle emission and plasma interaction with the medium, which ensures efficient synthesis of nanoparticles. In femtosecond laser evaporation (ablation) in liquid, these processes can be differentiated by controlling the pulse energy and environmental conditions. Fine tuning of the laser evaporation process leads to predictable results. The main technical solution was the TETA-10 femtosecond laser system [1]. The synthesized nanoparticles were examined using a Quanta 200 3D scanning electron microscope. Using femtosecond laser radiation from the TETA-10 system, material was ablated from the surface of a 40x40x5 mm tungsten volume target. The system used a potassium-gadolinium tungstate crystal doped with ytterbium. The laser operated at a wavelength of 1029 nm, had a pulse duration of 300 fs, a repetition rate of 10 kHz, and a pulse energy of 150 μJ. Tungsten nanoparticles were synthesized in liquid media: oxide in water, carbide in acetone, and nanoparticles in ethanol. At a laser power of 1 W in ethanol, nanoparticles of 20 to 200 nm in size with an average size of about 75 nm were obtained.