Preparation of ceramic nanospheres by CO2 laser vaporization (LAVA)

To prepare ceramic nanoparticles by CO2 laser vaporisation (LAVA), coarse ceramic powders (e.g. ZrO2, Al2O3, and TiO2) were used as raw materials. The raw powder was vaporised into a flowing process gas under normal pressure. Expanding into the gas, the vapour instantly cooled. Gas-phase condensatio...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 31; no. 14; pp. 2559 - 2568
Main Authors Kurland, H-D, Grabow, J, Muller, F A
Format Journal Article
LanguageEnglish
Published 01.11.2011
Subjects
Ceramic powders
Ceramics
Lava
Nanoparticles
Nanostructure
Raw
Titanium dioxide
Zirconium dioxide
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Summary:To prepare ceramic nanoparticles by CO2 laser vaporisation (LAVA), coarse ceramic powders (e.g. ZrO2, Al2O3, and TiO2) were used as raw materials. The raw powder was vaporised into a flowing process gas under normal pressure. Expanding into the gas, the vapour instantly cooled. Gas-phase condensation led to the formation of nanoscale particles with a composition that corresponded to that of the raw powder. The LAVA nanoparticles were chemically pure, spherical, crystalline, had a narrow size distribution, and formed soft agglomerates. The co-laser vaporisation of mixtures of ceramic raw powders allowed for the preparation of nanoparticles of multi-phase (e.g. Fe2O3-SiO2) or single-phase (e.g. CaTiO3) mixed-oxides and dispersion ceramics (e.g. ZrO2-Al2O3). In order to modify the surface of the nanoparticles they can be coated in-process with an organic additive. Therefore, the LAVA method allows for the targeted development of a wide range of ceramic nanopowders with tailored properties.
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ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2011.01.010