Nanocrystallites obtained through the pyrosol method

• Published in: Physica status solidi. A, Applications and materials science Vol. 205; no. 6; pp. 1488 - 1493
• Main Authors: Dinu, E., Andronescu, E., Ghitulica, C. D., Siebert, E., Djurado, E., Dessemond, L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.06.2008; WILEY‐VCH Verlag; Wiley-VCH; Wiley
• Subjects: 61.46.Hk; 68.37.Hk; 78.30.Hv; 81.07.Bc; 81.16.Bc; Chemical Sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Material chemistry; Materials science; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Physics; Particle size; Pyrosol process; Morphology; Operating mode; Crystallinity; Nanopowder; Porosity; Microstructure; Growth from solution; Nanocrystal
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.200778150

The decrease of particles size from micrometric to the nanometric scale is allowing the development of new materials, with dramatically improved properties. The pyrolysis of aerosols is a very interesting method of production for reactive nanopowders. In this study, the influence of various synthesis parameters on the crystallinity and the composition of calcium phosphate powders were investigated. Firstly, the influence of the chemical nature of the calcium precursor was studied, by using two types of water‐soluble calcium salts: CaCl2·2H2O and Ca(NO3)2. Secondly, the effect of the pyrolysis temperature, in the 600–1000 °C interval was studied. Whatever the temperature of pyrolysis of the aerosol, the apatite structure is recognizable, if the precursor used for the calcium oxide is calcium chloride. If the powders are elaborated starting from calcium nitrate, the only phase identified is β‐calcium phosphate. The synthesized powders have spherical morphology, are highly porous and dimensionally in the nanometric range. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)