Detailed Information on Publication Record
2009
NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
OSTŘÍŽEK, Petr, Petr BEZDIČKA, Zdeněk MORAVEC and Jiří PINKASBasic information
Original name
NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
Name in Czech
Příprava nanoskopických částic kobaltových ferritů sonolýzou acetylacetonátových komplexů kovů
Name (in English)
NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
Authors
OSTŘÍŽEK, Petr (203 Czech Republic, belonging to the institution), Petr BEZDIČKA (203 Czech Republic), Zdeněk MORAVEC (203 Czech Republic, belonging to the institution) and Jiří PINKAS (203 Czech Republic, guarantor, belonging to the institution)
Edition
ChemZi, 2009
Other information
Language
Czech
Type of outcome
Konferenční abstrakt
Field of Study
10402 Inorganic and nuclear chemistry
Country of publisher
Slovakia
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/00216224:14310/09:00051212
Organization unit
Faculty of Science
ISSN
Keywords (in Czech)
nanočástice; kobalt; ferrity; sonolýza; acetylacetonáty
Keywords in English
nanoparticles; cobalt; ferrites; sonolysis; acetylacetonates
Tags
International impact
Změněno: 5/4/2012 10:21, Iva Klímová
V originále
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.
In English
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.
Links
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