Detailed Information on Publication Record
2008
Sonochemical synthesis of amorphous nanoscopic iron(III) oxide from Fe(acac)3
PINKAS, Jiří, Vendula REICHLOVÁ, Radek ZBOŘIL, Zdeněk MORAVEC, Petr BEZDIČKA et. al.Basic information
Original name
Sonochemical synthesis of amorphous nanoscopic iron(III) oxide from Fe(acac)3
Name in Czech
Sonochemická syntéza amorfních nanoskopických oxidů železitých sonolýzou Fe(acac)3
Authors
PINKAS, Jiří (203 Czech Republic, guarantor), Vendula REICHLOVÁ (203 Czech Republic), Radek ZBOŘIL (203 Czech Republic), Zdeněk MORAVEC (203 Czech Republic), Petr BEZDIČKA (203 Czech Republic) and Jiřina MATEJKOVÁ (203 Czech Republic)
Edition
Ultrasonics Sonochemistry, Elsevier, 2008, 1350-4177
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10402 Inorganic and nuclear chemistry
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 2.796
RIV identification code
RIV/00216224:14310/08:00024586
Organization unit
Faculty of Science
UT WoS
000252905500016
Keywords in English
Sonochemistry; Iron; Oxides; Nanoparticles
Tags
Tags
International impact, Reviewed
Změněno: 26/6/2009 16:28, prof. RNDr. Jiří Pinkas, Ph.D.
V originále
Amorphous nanoscopic iron(III) oxide with interesting magnetic properties was prepared by sonolysis of Fe(acac)3 under Ar in tetraglyme with a small amount of added water. The organics content and the surface area of the Fe2O3 nanoparticles can be controlled with an amount of water in the reaction mixture and it increases from 48 m2 g-1 for dry solvent up to 260 m2 g-1 when wet Ar is employed. For further monitoring of the particle size and morphology and for the study of the surface, magnetic and thermal properties, the sample with 2 vol.% of H2O was chosen. SEM showed nanoscopic composite particles of a uniform size distribution and nearly spherical shapes with an estimated diameter of 20 nm. Such composites are built from amorphous iron(III) oxide nanoparticles (3 nm) embedded in an acetate matrix as proved by TEM and IR spectroscopy. Temperature-dependent Moessbauer spectra demonstrate a very narrow magnetic transition with an unusually low transition temperature around 25 K reflecting the system of magnetically noninteracting ultrasmall particles with a narrow size distribution. The in-field (5 T) Moessbauer spectrum recorded at 5 K shows a minimum change compared to the zero-field spectrum indicating an absence of the long-range magnetic ordering. The composite particles are thermally stable up to 150 oC, which is confirmed by DSC, TG, and by the constant surface area. At higher temperatures, acetate groups are removed from the particle surface, which is documented by the increased surface area and disappearance of their IR bands.
In Czech
Nanočástice amorfního oxidu Fe2O3 se zajímavými magnetickými vlastnostmi byly syntetizovány sonochemickou metodou z komplexu Fe(acac)3 pod Ar v tetraglymu s malým přídavkem vody. Měrný povrch nanočástic může být řízen od 48 m2 g-1 po 260 m2 g-1 přídavkem vody. Připravené nanočástice oxidu železa (3 nm) jsou amorfní a jsou uloženy biokompatibilní matrici sestávající z acetátových skupin (20 nm).
Links
| GA203/04/0296, research and development project |
| ||
| MSM0021622410, plan (intention) |
|