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Investigation of solid phase upon γ-irradiation of ferrihydrite-ethanol suspension


Jurkin, Tanja; Zadro, Krešo; Gotić, Marijan; Musić, Svetozar
Investigation of solid phase upon γ-irradiation of ferrihydrite-ethanol suspension // Radiation physics and chemistry, 80 (2011), 7; 792-798 doi:10.1016/j.radphyschem.2011.02.031 (međunarodna recenzija, članak, znanstveni)


Naslov
Investigation of solid phase upon γ-irradiation of ferrihydrite-ethanol suspension

Autori
Jurkin, Tanja ; Zadro, Krešo ; Gotić, Marijan ; Musić, Svetozar

Izvornik
Radiation physics and chemistry (0969-806X) 80 (2011), 7; 792-798

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

Ključne riječi
Ferrihydrite ; gamma-irradiation ; carbonisation ; ethanol ; suspension ; SQUID

Sažetak
Ferrihydrite (FH) nanoparticles were synthesised and subjected to γ-irradiation in the form of FH-ethanol suspension. The dose rate of γ-radiation was 16 kGy/h and the samples were irradiated to doses of up to 2590 kGy. γ-irradiation of FH-ethanol suspensions did not cause the transformation of FH to any of the other iron oxide phases. Likewise, neither the Mössbauer and FT-IR spectroscopy nor the quantitative analysis using Energy Dispersive X-ray Spectroscopy gave any evidence of structural changes of FH upon γ-irradiation. C, H analysis showed that the C concentration in FH gradually increased with dose and was higher in γ-irradiated FH samples than in non-irradiated FH sample. This finding suggested that carbon in FH originated from ethanol degradation. The H concentration in FH gradually increased to the dose of up to 368 kGy and then slightly decreased. Magnetic measurements showed a progressive decrease in magnetisation with an increase in γ-irradiation. The results of magnetic measurements and C, H analysis suggested the carbonisation of FH surface. It was supposed that γ-irradiation of FH-ethanol suspension reductively decomposed ethanol thus generating unsaturated hydrocarbons and acetylides, which in turn formed a conjugate iron complex, thus carbonating the FH surface. The carbonisation of the FH surface prevented FH transformation to other iron oxide phases.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija



POVEZANOST RADA


Projekt / tema
098-0982904-2952 - Sinteza i mikrostruktura metalnih oksida i oksidnih stakala (Mira Ristić, )
098-0982904-2955 - Odnosi struktura-svojstvo modificiranih polimernih materijala (Irina Pucić, )
119-1191458-1017 - Nanomagneti (Krešo Zadro, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

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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