Naslov
Gamma-irradiation synthesis of magnetic iron oxide nanoparticles, gels and magnetic Au and Ag nanostructures

Autori
Jurkin, Tanja ; Marić, Ivan ; Pustak, Anđela ; Gotić, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
International Conference on Ionizing Processes (ICIP) Agenda and Abstracts / Horne, Gregory - Idaho Falls (ID), 2022, 1-1

Skup
8th Regional Symposium on Electrochemistry of South-East Europe ; 9th Kurt Schwabe Symposium

Mjesto i datum
Graz, Austrija, 11.07.2022. - 15.07.2022

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
magnetic iron oxides ; magnetite ; feroxyhyte ; magnetic gels, gamma radiation ; magnetic feroxyhyte-Au nanodiscs

Sažetak
Magnetic iron oxide nanoparticles (MIONPs) and their magnetic gels are versatile materials, but their radiolytic synthesis has hardly been studied. We have used γ-irradiation as a powerful technique for the synthesis of MIONPs of controlled size, shape and phase composition, as well as for one-step synthesis of magnetic gels. To control the size and stability of MIONPs, the synthesis was carried out in a microemulsion and in the presence of polymers. The γ-irradiation dose and dose rate affected the stoichiometry and size of the magnetite NPs synthesized in the microemulsion. The polymer had a pronounced effect on the reduction conditions and the final product obtained upon irradiation of Fe(III) precursor suspensions. In the presence of DEAE-dextran highly concentrated ferrofluids with 4 nm spherical, superparamagnetic magnetite NPs were produced at 10-36 kGy. At 75 kGy, the complete reduction of Fe3+ to Fe2+ resulted in the magnetic δ-FeOOH nanodiscs. The reducing power of Fe2+ formed was explored to synthesize composite iron oxide/Au and Ag nanostructures. The simultaneous oxidation of Fe(OH)2 and reduction of Au3+ or Ag+ led to the formation of δ-FeOOH nanodiscs decorated with Au or Ag NPs. The synthesized NPs were tested for SERS and catalytic activity. On the other hand, when irradiated in the presence of PEO and PVP, a lower reduction was obtained and magnetic suspensions or magnetic nanocomposite hydrogels were formed depending on the initial conditions. This result is the first report of γ- irradiation synthesis of magnetic hydrogels in a single step. More amorphous and stronger gels were formed at higher dose and Fe(III) precursor concentration. The synthesized MIONPs acted as reinforcing agent and additional crosslinkers of polymer chains. The gels exhibited good self- recoverable properties and superparamagnetic behavior even at very low temperatures. Acknowledgments: This work has been supported by the Croatian Science Foundation under the project UIP-2017-05-7337 (POLRADNANOP).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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