Low temperature superparamagnetic nanocomposites obtained by Fe(acac)(3)-SiO2-PVA hybrid xerogel thermolysis
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F16%3A10337494" target="_blank" >RIV/00216208:11310/16:10337494 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.2298/PAC1604265I" target="_blank" >http://dx.doi.org/10.2298/PAC1604265I</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2298/PAC1604265I" target="_blank" >10.2298/PAC1604265I</a>
Alternative languages
Result language
angličtina
Original language name
Low temperature superparamagnetic nanocomposites obtained by Fe(acac)(3)-SiO2-PVA hybrid xerogel thermolysis
Original language description
Fe(acac)(3)/silica/PVA hybrid xerogel nanocomposite was obtained by one pot acid catalysed sol-gel synthesis using the homogeneous mixture of iron(III) acetylacetonate (Fe(acac)(3)), tetraethylorthosilicate (TEOS), and polyvinyl alcohol (PVA). Nominal composition ratio of iron oxide/silica was 15/85 (weight percent). Nitric acid was used as catalyst. Another sample of Fe(acac)(3)/silica xerogel without PVA addition was prepared in the similar processing conditions. Based on thermal analysis studies, the thermal behaviour of both xerogel samples was unveiled and it allowed choosing the optimal calcination temperatures in order to obtain iron oxide silica magnetic nanocomposite samples. The two xerogel (with and without PVA) samples were thermally treated, in air, at 220, 260 and 300 degrees C and characterized by different techniques. XRD investigations revealed phase composition evolution with calcination temperature, from cubic spinel phase (maghemite) to hexagonal stable hematite containing nanocomposite of 10-20 nm average crystallite size. These findings were confirmed by Mossbauer spectroscopy. Up to 300 degrees C, the surface area and total pores volume increased with temperature for all samples. By calcination at the same temperature, the hybrid xerogel containing PVA resulted in significantly higher magnetization and free volume values in comparison with the sample without PVA.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JH - Ceramics, fire-proof materials and glass
OECD FORD branch
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Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Processing and Application of Ceramics
ISSN
1820-6131
e-ISSN
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Volume of the periodical
10
Issue of the periodical within the volume
4
Country of publishing house
CS - SERBIA AND MONTENEGRO
Number of pages
11
Pages from-to
265-275
UT code for WoS article
000393209100009
EID of the result in the Scopus database
2-s2.0-85007504636