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Ceria nanoparticles were synthesized by two different wet softchemistry routes, the thermal decomposition of a tartrate-based precursor and the reverse microemulsion method. The tartrate-based precursor was characterized by FTIR spectroscopy and thermal analysis, whereas the sample isolated from the microemulsion by X-ray diffraction. The precursors were calcined at 500°C, 3h in air and oxide nanopowders were investigated by X-ray diffraction, transmission electron microscopy and selected area electron diffraction. Ceria sample obtained by decomposition of tartrate-based precursor has nanoparticles in the range of 6 - 12 nm with a slight tendency of agglomeration and a specific surface area of 28 m2/g, whereas the sample synthesized by reverse microemulsion method has nanoparticles of 6 nm average size, with very narrow size distribution, and higher specific surface aria, 68 m^sup 2^/g.
Nanoparticulele de oxid de ceriu s-au obtínut prin doua tehnici neconventionale de sinteza, descompunerea termica a unui precursor pe baza de tartrat si metoda microemulsiilor inverse. Precursorul de tip tartrat s-a caracterizat prin spectroscopie FTIR si analiza termica, iar proba rezultata dupa Îndepartarea microemulsiei, prin difractie de raze X. Precursorii au fost calcinati la 500°C, 3h, În aer si nanopulberile oxidice au fost investigate prin difractie de raze X, microscopie electronica În transmisie si difractie de electroni pe arie selectata. Proba de oxid de ceriu obtinuta prin descompunerea precursorul de tip tartrat se prezinta sub forma de nanoparticule cu dimensiuni Între 6 si 12 nm, cu o usoara tendinta de aglomerare, având o suprafata specifica de 28 m2/ g, În timp ce proba sintetizata prin metoda microemulsiilor inverse este constituita din nanoparticule cu dimensiunea medie de 6 nm, cu o distributie Îngusta a dimensiunilor si o suprafata specifica mai mare, 68 m^sup 2^/g.
Keywords: ceria nanoparticles, reverse microemulsion, thermal decomposition method, tartrate-based precursor
Ceria is one of the most studied oxides in the last twenty years. It was extensively investigated as catalyst [1,2] or catalyst support [3], UV absorber [4], gas sensor [5], optic material [6], abrasive powder [7] and solid oxide electrolyte in SOFC [8]. Recently, it was discovered that CeO2 nanoparticles have scavenger properties against radical oxygen species (ROS) that could be useful in the prevention of retinal [9] and neuronal degeneration [10]. The nanoparticle size is one of the key factors in all...