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  • Title: Pure colloidal metal and ceramic nanoparticles from high-power picosecond laser ablation in water and acetone.
    Author: Bärsch N, Jakobi J, Weiler S, Barcikowski S.
    Journal: Nanotechnology; 2009 Nov 04; 20(44):445603. PubMed ID: 19801779.
    Abstract:
    The generation of colloids by laser ablation of solids in a liquid offers a nearly unlimited material variety and a high purity as no chemical precursors are required. The use of novel high-power ultra-short-pulsed laser systems significantly increases the production rates even in inflammable organic solvents. By applying an average laser power of 50 W and pulse durations below 10 ps, up to 5 mg min(-1) of nanoparticles have been generated directly in acetone, marking a breakthrough in productivity of ultra-short-pulsed laser ablation in liquids. The produced colloids remain stable for more than six months. In the case of yttria-stabilized zirconia ceramic, the nanoparticles retain the tetragonal crystal structure of the ablated target. Laser beam self-focusing plays an important role, as a beam radius change of 2% on the liquid surface can lead to a decrease of nanoparticle production rates of 90% if the target position is not re-adjusted.
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