Naslov
Static and dynamic magnetic properties of radiolytically synthesized maghemite-based ferrogels

Autori
Marić, Ivan ; Zadro, Krešo ; Novosel Nikolina ; Gotić, Marijan ; Pustak, Anđela ; Jurkin, Tanja

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

Izvornik
32nd Miller Conference on Radiation Chemistry : Book of abstracts / - , 2023, 95-95

Skup
32nd Miller Conference on Radiation Chemistry

Mjesto i datum
Korzika, Francuska, 03.06.2023. - 08.06.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
magnetic ferrogels ; maghemite ; magnetite ; superparamagnetic ; magnetic properties

Sažetak
Polymer hydrogels embedded with magnetic nanoparticles are a novel class of composite materials and they gained a lot of attention in the last two decades due to their interesting properties which combine the viscoelasticity of the polymeric network and the sensitivity of magnetic nanoparticles to the external magnetic field. Although γ- irradiation method is highly suitable for generation of nanoparticles (NPs) in a solution as well as for the formation of three-dimensional polymer network, i.e. hydrogels, the radiolytic syntheses of iron oxide/polymer nanocomposite gels are rarely investigated, especially in the case of one-step synthetic approaches, such as the one used in this work. The radiolytic one-step synthesis resulted in the simultaneous crosslinking of the PEO polymer and the reduction of iron (III) salt. In this work, we performed electron microscopy, XRD, SQUID (ZFC and FC, magnetization-temperature measurements), ac susceptometry and Mössbauer measurements (external magnetic field) to elucidate the structural and magnetic properties of synthesized ferrogels. The particles were identified as magnetite/maghemite and showed that they were < 5 nm in size, superparamagnetic and that there was a significant contribution of surface effects on the magnetic properties of the nanoparticles embedded in the hydrogel. Mössbauer measurements showed that the samples consist of core-shell magnetic structure and large spin canting (32-36°) on the outer layer of the particles. Furthermore, a significant contribution of spin-glass behavior and/or dipole-dipole interactions between the nanoparticles was seen from ac susceptometry and SQUID magnetometry. 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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