NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES

OSTŘÍŽEK, Petr, Petr BEZDIČKA, Zdeněk MORAVEC a Jiří PINKAS. NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES. In ChemZi. ISSN 1336-7242. 2009.

Základní údaje

• Originální název: NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
• Název česky: Příprava nanoskopických částic kobaltových ferritů sonolýzou acetylacetonátových komplexů kovů
• Název anglicky: NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
• Autoři: OSTŘÍŽEK, Petr (203 Česká republika, domácí), Petr BEZDIČKA (203 Česká republika), Zdeněk MORAVEC (203 Česká republika, domácí) a Jiří PINKAS (203 Česká republika, garant, domácí).
• Vydání: ChemZi, 2009.

Další údaje

• Originální jazyk: čeština
• Typ výsledku: Konferenční abstrakt
• Obor: 10402 Inorganic and nuclear chemistry
• Stát vydavatele: Slovensko
• Utajení: není předmětem státního či obchodního tajemství
• Kód RIV: RIV/00216224:14310/09:00051212
• Organizační jednotka: Přírodovědecká fakulta
• ISSN: 1336-7242
• Klíčová slova česky: nanočástice; kobalt; ferrity; sonolýza; acetylacetonáty
• Klíčová slova anglicky: nanoparticles; cobalt; ferrites; sonolysis; acetylacetonates
• Štítky: IK, rivok
• Příznaky: Mezinárodní význam

Anotace

Previously we studied the preparation of Fe2O3 and Co3O4 nanoparticles by sonolysis of 2,4-pentanedionato complexes, M(acac)n, M = Fe, Co. Now we continue this research with the preparation of mixed metal oxide CoFe2O4. Sonochemical decompositon of mixtures of M(acac)n by high intensity ultrasound lead to amorphous Co ferrite nanoparticles containing organic matrix. The sonochemical reactivity of precursors was: Co(acac)2 > Fe(acac)3 > Co(acac)3. The XRD data showed that phase-pure CoFe2O4 were obtained for Co:Fe ratios of 1:1.3 to 1:2.0. Variable amounts of added water allowed control of the organics content and the BET surface area (up to 218 m2 g-1). SEM was used to examine the particle shape, size, and size distribution. The organic groups present in the powders were identified by IR and MS as acetate groups. TEM study showed the amorphous state of the sonochemical oxide product and its crystallization above 300 oC in agreement with the results of TG/DSC. The HT-XRD also revealed the spinel crystallization on heating. A small particle size below 20 nm of the crystalline CoFe2O4 is retained up to 600 oC. The delayed crystal growth is ascribed to the protective action of a thin surface layer of pyrolyzed organics.

Anotace anglicky

Previously we studied the preparation of Fe2O3 and Co3O4 nanoparticles by sonolysis of 2,4/pentanedionato complexes, M(acac)n, M = Fe, Co. Now we continue this research with the preparation of mixed metal oxide CoFe2O4. Sonochemical decompositon of mixtures of M(acac)n by high intensity ultrasound lead to amorphous Co ferrite nanoparticles containing organic matrix. The sonochemical reactivity of precursors was: Co(acac)2 > Fe(acac)3 > Co(acac)3. The XRD data showed that phase-pure CoFe2O4 were obtained for Co:Fe ratios of 1:1.3 to 1:2.0. Variable amounts of added water allowed control of the organics content and the BET surface area (up to 218 m2 g-1). SEM was used to examine the particle shape, size, and size distribution. The organic groups present in the powders were identified by IR and MS as acetate groups. TEM study showed the amorphous state of the sonochemical oxide product and its crystallization above 300 oC in agreement with the results of TG/DSC. The HT-XRD also revealed the spinel crystallization on heating. A small particle size below 20 nm of the crystalline CoFe2O4 is retained up to 600 oC. The delayed crystal growth is ascribed to the protective action of a thin surface layer of pyrolyzed organics.

Návaznosti

• MSM0021622410, záměr: Název: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Fyzikální a chemické vlastnosti pokročilých materiálů a struktur