부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jssc.2008.04.036 Byline: Emanuel Kockrick (a), Christian Schrage (a), Anett Grigas (a), Dorin Geiger (b), Stefan Kaskel (a) Keywords: Ceria nanoparticles; Inverse microemulsion; Small angle X-ray scattering; Dynamic light scattering; Catalysis; Soot combustion Abstract: The synthesis of cerium dioxide nanoparticles using an inverse microemulsion technique and precipitation method was investigated. Cerium hydroxide nanoparticles were synthesized by adding diluted ammonia to n-heptane-surfactant-cerium nitrate system. The micelle and particle size in the range of 5-12nm were controlled by varying the molar water to surfactant ratio and analyzed by dynamic light scattering (DLS), small angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM). Cerium hydroxide nanoparticles were isolated and subsequently treated at 100-600[degrees]C to obtain nanoscale ceria. Crystallite sizes of cerium dioxide in the range of 6-16nm were estimated by Scherrer analysis by X-ray diffraction (XRD) and HRTEM. The catalytic activity of particles annealed at 400 and 600[degrees]C in soot combustion reactions was characterized by temperature-programmed oxidation (TPO) indicating a size-dependant activity. Crystallite sizes and catalytic stability of elevated ceria systems were tested in second combustion cycles. Author Affiliation: (a) Department of Inorganic Chemistry, Dresden University of Technology, Mommsenstr. 6, D-01062 Dresden, Germany (b) Triebenberg Laboratory for HRTEM and Electron Holography, Institute for Structure Physics, Dresden University of Technology, Zum Triebenberg 50, D-01328 Dresden, Germany Article History: Received 31 January 2008; Revised 11 April 2008; Accepted 23 April 2008 Article Note: (footnote) [star] Financial support by the German Research Foundation (KA 1698/6-1) in the NanoMat Program SPP 1181 is gratefully acknowledged.