Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical methodn
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F23%3A00574239" target="_blank" >RIV/68081723:_____/23:00574239 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0272884223013275?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0272884223013275?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ceramint.2023.05.080" target="_blank" >10.1016/j.ceramint.2023.05.080</a>
Alternative languages
Result language
angličtina
Original language name
Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical methodn
Original language description
Amorphous-crystalline nanoparticles (NPles) of maghemite (gamma-Fe2O3) were successfully prepared by a radiation-chemical method using a precursor-heptahydrate of iron (II) sulfate. Synthesized NPles were quasi-spherical agglomerates 200-300 nm in size with an uneven surface covered with thin, porous, randomly oriented, elongated plates of irregular shape, with sharp vertices. The amorphous component of NPles included ultra-fine NPles maghemite about 2 nm in size. Stepwise annealing of the original nanopowder (NP) in air showed a phase transformation of NPles along the following path: maghemite + amorph (RT-150 degrees C) -> amorph (200-500 degrees C) -> hematite (570-1050 degrees C). The hematite NP produced after annealing at a temperature of 575 degrees C showed good texture characteristics: the specific surface area (SSA) increased from 21 to 36.8 m(2)/g, the pore volume increased from 0.04 to 0.15 cm(3)/g, while maintaining the particle nanosize of not more than 38 nm. X-ray photoelectron spectroscopy (XPS) showed the presence of the following elements on the surface of the synthesized NPles -S, C, O, Fe and N (N only in the original sample S0) and increased O-Fe bond with an increase in annealing temperature. The paramagnetic properties of the studied NPles indicate the prospect of their use as contrast agents in magnetic resonance imaging (MRI).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
21001 - Nano-materials (production and properties)
Result continuities
Project
<a href="/en/project/GC21-31852J" target="_blank" >GC21-31852J: Properties of Nanopowders Prepared by a Pulsed Electron Beam Method in a Low-Pressure Gas</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Ceramics International
ISSN
0272-8842
e-ISSN
1873-3956
Volume of the periodical
49
Issue of the periodical within the volume
15
Country of publishing house
GB - UNITED KINGDOM
Number of pages
13
Pages from-to
25414-25426
UT code for WoS article
001027058400001
EID of the result in the Scopus database
2-s2.0-85159195052