OSTŘÍŽEK, Petr, Petr BEZDIČKA, Zdeněk MORAVEC and Jiří PINKAS. NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES. In ChemZi. 2009. ISSN 1336-7242.
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Basic 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
Original language Czech
Type of outcome Conference abstract
Field of Study 10402 Inorganic and nuclear chemistry
Country of publisher Slovakia
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14310/09:00051212
Organization unit Faculty of Science
ISSN 1336-7242
Keywords (in Czech) nanočástice; kobalt; ferrity; sonolýza; acetylacetonáty
Keywords in English nanoparticles; cobalt; ferrites; sonolysis; acetylacetonates
Tags IK, rivok
Tags International impact
Changed by Changed by: Iva Klímová, učo 58563. Changed: 5/4/2012 10:21.
Abstract
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.
Abstract (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
MSM0021622410, plan (intention)Name: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur
Investor: Ministry of Education, Youth and Sports of the CR, Physical and chemical properties of advanced materials and structures
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