Detailed Information on Publication Record
2005
Sonochemical synthesis of metal oxides and phosphates
PINKAS, Jiri, Vendula REICHLOVÁ, Zdenek MORAVEC and Petr OSTŘÍŽEKBasic information
Original name
Sonochemical synthesis of metal oxides and phosphates
Name in Czech
Sonochemická příprava oxidů a fosfátů kovů
Authors
PINKAS, Jiri (203 Czech Republic, guarantor), Vendula REICHLOVÁ (203 Czech Republic), Zdenek MORAVEC (203 Czech Republic) and Petr OSTŘÍŽEK (203 Czech Republic)
Edition
1. vyd. Honolulu, USA, Pacifichem 2005 - ENVR 531, p. 531-531, 1 pp. 2005
Publisher
ACS
Other information
Language
English
Type of outcome
Stať ve sborníku
Field of Study
10402 Inorganic and nuclear chemistry
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/00216224:14310/05:00013017
Organization unit
Faculty of Science
Keywords in English
iron oxide; sonochemical synthesis
Změněno: 31/5/2009 22:21, prof. RNDr. Jiří Pinkas, Ph.D.
V originále
Sonochemical processes are due to their nonequilibrium nature employed for the preparation of amorphous and nanoscopic materials. Physical and chemical properties of the reaction solvent influence the nature of the obtained products. We found that ultrasound-activated reactions of metalloorganic precursors in inert (tetraglyme) and reactive (tributyl phosphate) solvents provide oxide and phosphate materials, respectively. Aluminum triisopropoxide and aluminum tris(acetylacetonate) were used to prepare both aluminum oxide and phosphate depending on the employed solvent. Similarly, sonicated solutions of iron tris(acetylacetonate) in tributyl phosphate provide iron phosphate while colloidal solutions of amorphous nanoscopic particles of iron oxide are formed in tetraglyme. The sonochemically produced powders were characterized by a variety of physico-chemical methods. IR spectroscopy, elemental analysis and thermal analysis established the presence of surface organic groups in the as-prepared samples and their removal by heating in air. SEM showed nearly spherical uniform nanoparticles of Fe2O3 with an average diameter of 20 nm. The specific surface area of nanopowders was established from nitrogen adsorption isotherms by the BET method. Amorphous nature of the as-prepared iron oxide was exhibited in the HRTEM micrographs. The crystallization process was followed by the variable temperature powder XRD. The specific surface area increased upon calcination to 300 şC.
In Czech
Sonochemická příprava oxidů a fosfátů kovů
Links
| GA203/04/0296, research and development project |
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| MSM0021622410, plan (intention) |
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