Naslov
Microstructural characterization of radiolytically synthesized feroxyhyte and magnetite nanoparticles

Autori
Marić, Ivan ; Dražić, Goran ; Štefanić, Goran ; Zadro, Krešo ; Gotić, Marijan ; Jurkin, Tanja

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

Izvornik
Solid-State Science & Research Meeting Book of Abstracts / Biliškov, Nikola - Zagreb : Institut Ruđer Bošković, 2019, 79-79

ISBN
978-953-7941-32-1

Skup
Solid State Science and Research Meeting

Mjesto i datum
Zagreb, Hrvatska, 27.06.2019. - 29.06.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
gamma-irradiation ; amino dextran ; green rust ; iron(II) hydroxide ; feroxyhyte ; magnetite

Sažetak
Iron(III) chloride deaerated alkaline aqueous colloidal solutions in the presence of 2- propanol and DEAE-dextran (diethylaminoethyl- dextran hydrochloride) were γ-irradiated with doses of 36 and 130 kGy. The dose rates were ~7 and ~31 kGy h-1. Substoichiometric magnetite nanoparticles ~4-5 nm in size formed at a dose of 36 kGy. The dose rate had an effect on the stoichiometry of the formed magnetite. At a dose of 130 kGy and the lower dose rate, the anisotropic d-FeOOH magnetic discs with a diameter of ~256 nm and thickness of ~40 nm self-assembled. At a dose of 130 kGy and the higher dose rate, the rolled rod-like d-FeOOH magnetic nanoparticles were formed having the diffraction patterns characteristic of tubular structures. The magnetic measurements showed exceptional intrinsic room-temperature magnetic properties of both d-FeOOH nanostructures with the Curie temperature above 300 K. In order to ascertain the formation of Fe(II) intermediate products prior to their oxidation, the γ- irradiated samples were isolated by admixing glycerol. The amounts of Fe(II) in glycerol- isolated solid samples were 9.9 % and 86.0 %, as determined by Mössbauer spectroscopy at doses of 36 and 130 kGy, respectively. Carbonate Green Rust I, GR(CO32-), and Fe(OH)2 intermediate phases were confirmed by XRD and Mössbauer spectroscopy.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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