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Pregled bibliografske jedinice broj: 1040800

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles


Marić, Ivan; Dražić, Goran; Štefanić, Goran; Zadro, Krešo; Gotić, Marijan; Jurkin, Tanja
Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles // Materials Characterization, 159 (2020), 110038, 13 doi:10.1016/j.matchar.2019.110038 (međunarodna recenzija, članak, znanstveni)


Naslov
Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

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

Izvornik
Materials Characterization (1044-5803) 159 (2020); 110038, 13

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Feroxyhyte ; magnetite ; maghemite ; gamma-irradiation ; Green rust ; Iron(II) hydroxide

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. The extremely stable aqueous suspension of substoichiometric Fe2.83O4 magnetite nanoparticles ~4.7 nm in size were formed at a dose rate of ~7 kGy h−1 and at a dose of 36 kGy. At a dose of 130 kGy the anisotropic δ-FeOOH magnetic discs with a diameter of ~256 nm and thickness of ~40 nm were formed. Each disc has a substructure consisting of approximately eighteen laterally stacked thin nanodiscs of about 2.2 nm in thickness. At a higher dose rate of ~31 kGy h−1and at a dose of 36 kGy, XRD revealed the presence of highly substoichiometric Fe2.75O4 magnetite, whereas TEM analysis revealed the presence of ~4.3 nm magnetite nanoparticles along with rod-shaped γ-Fe2O3 nanoparticles. The values of isomer shift in Mössbauer spectra of about 0.33 mm s−1 showed that all Fe(II) in substoichiometric magnetites oxidized to Fe(III) one month after synthesis. At high dose and dose rate, the rolled rod-like δ-FeOOH magnetic nanoparticles were formed having the diffraction patterns with streaks, which are characteristic of tubular structures. The magnetic measurements showed exceptional intrinsic room-temperature magnetic properties of both δ-FeOOH nanostructures with the Curie temperature above 300 K. In order to ascertain the formation of Fe(II) intermediate products prior to their oxidation, γ-irradiated samples were isolated by admixing glycerol. The amounts of Fe(II) in glycerol-isolated solid samples were determined using Mössbauer spectroscopy. Carbonate Green Rust I [GR(CO32−)] and Fe(OH)2 intermediate phases were confirmed by XRD and Mössbauer spectroscopy. The amounts of Fe2+ in the acidified solutions containing dissolved γ- irradiation ferrous products were determined using the potassium permanganate titration. The amounts of Fe2+ were 68.9% and 96.1% at doses of 36 and 130 kGy, respectively. Thus, at a dose of 130 kGy the radiolytically generated Fe(OH)2, after coming in contact with oxygen and CO2 from the air, topotactically oxidized to GR(CO32−) and further to δ-FeOOH without any structural changes. The lower dose rate (~7 kGy h−1) favored the δ-FeOOH nanodisc morphology, whereas the higher dose rate (~31 kGy h−1) favored the formation of tubular rod-like δ-FeOOH nanoparticles.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-UIP-2017-05-7337 - Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica (Tanja Jurkin, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Citiraj ovu publikaciju

Marić, Ivan; Dražić, Goran; Štefanić, Goran; Zadro, Krešo; Gotić, Marijan; Jurkin, Tanja
Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles // Materials Characterization, 159 (2020), 110038, 13 doi:10.1016/j.matchar.2019.110038 (međunarodna recenzija, članak, znanstveni)
Marić, I., Dražić, G., Štefanić, G., Zadro, K., Gotić, M. & Jurkin, T. (2020) Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles. Materials Characterization, 159, 110038, 13 doi:10.1016/j.matchar.2019.110038.
@article{article, year = {2020}, pages = {13}, DOI = {10.1016/j.matchar.2019.110038}, chapter = {110038}, keywords = {feroxyhyte, magnetite, maghemite, gamma-irradiation, Green rust, Iron(II) hydroxide}, journal = {Materials Characterization}, doi = {10.1016/j.matchar.2019.110038}, volume = {159}, issn = {1044-5803}, title = {Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles}, keyword = {feroxyhyte, magnetite, maghemite, gamma-irradiation, Green rust, Iron(II) hydroxide}, chapternumber = {110038} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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