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Publikācija: Synthesis

Publication Type Publications in RTU scientific journal
Funding for basic activity Unknown
Defending: ,
Publication language Latvian (lv)
Title in original language Dzelzs oksīda magnētisko nanodaļiņu sintēze, īpašības un pielietošanas iespējas
Title in English Synthesis, Properties and Applications of Magnetic Iron Oxide Nanoparticles
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Aļona Gabrene
Inna Juhņeviča
Janīna Sētiņa
Gundars Mežinskis
Keywords magnetic nanoparticles,iron oxidessol-gel methodcoprecipitation from salt solutions
Abstract Pateicoties unikālām īpašībām, labai biosaderībai un zemiem toksikoloģiskiem rādītājiem, dzelzs oksīda magnētiskās nanodaļiņas ir perspektīvs pētījumu objekts. Magnētisko nanodaļiņu sintēzei izmantoja sola-gēla metodi un nogulsnēšanu no šķidras fāzes. Lai kontrolētu reakcijas kinētiku, kas ir cieši saistīta ar dzelzs jonu oksidācijas ātrumu, magnetīta daļiņu sintēze jāveic bezskābekļa vidē, piemēram, barbotējot argona gāzi. Izstrādāti sastāvi α-Fe2O3, γ-Fe2O3 un Fe3O4 sintēzei, ko apliecina rentgenstaru difrakcijas analīzes pētījumu rezultāti.
Abstract in English improves the quality of the glass surface in glass slide preparation stage significantly, which was established by the AFM results. FexOy-SiO2 system is obtained by sol-gel method. There were sol compositions obtained for α-Fe2O3 and Fe3O4 synthesis. Different acids as hydrolysis catalyst agents and additives as iron compounds were used. Fe3O4 coprecipitation from salt solutions was determining necessity of non-oxygen environment to prevent the oxidation of magnetite. Analysis of Fe3O4 based coating methods concluded that the magnetite encapsulation between two SiO2 sol layers provide better quality of the obtained coatings, compared the adding of magnetite direct to SiO2 sol. Based on results obtained from SEM analysis of FexOy-SiO2 sol-gel coatings it can be concluded that after high temperature treatment agglomeration of FexOy particles on the surface of coatings forms stranded iron grain chains. However, Fe3O4 powder particles had a very high agglomeration tendency which can be explained by the hydrophobic and magnetic interactions between particles. Fe-O bond vibrations region in FT-IR spectra made possible to identify magnetite, hematite and maghemite. Hematite Fe-O bond at 530 cm-1, magnetite at 590 cm-1 and 450 cm-1, maghemite at 570 cm-1 and 440 cm-1 were observed. DTA data of Fe3O4 powder has confirmed: physically bound water release at 102 °C, magnetite oxidation to form maghemite at 255 °C and transformation of maghemite to hematite at 499 °C. Literature and BET analysis based data may provide that particle sizes will not exceed 150 nm for Fe3O4 synthesized by the coprecipitation method. BET active surface area is 92, 3 m2/g.
Reference Gabrene, A., Juhņeviča, I., Sētiņa, J., Mežinskis, G. Synthesis, Properties and Applications of Magnetic Iron Oxide Nanoparticles. Materials Sciences and Applied Chemistry. Vol.27, 2013, pp.11-16. ISSN 1407-7353. e-ISSN 2255-8713.
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