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Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method

Marić, Ivan; Šijaković Vujičić, Nataša; Pustak, Anđela; Gotić, Marijan; Štefanić, Goran; Grenèche, Jean-Marc; Dražić, Goran; Jurkin, Tanja (2020) Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method. Nanomaterials, 10 (9). ISSN 2079-4991

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Abstract

Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step γ-irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. γ-irradiation dose and concentrations of Fe3+, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of γ-irradiation generated Fe2+ was performed using the 1, 10-phenanthroline method. The maximal Fe2+ molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe3+. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe3+ content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.

Item Type: Article
Uncontrolled Keywords: magnetic hydrogel ; gamma-irradiation ; poly(ethylene oxide) ; magnetite ; rheological properties ; thermal properties ; 57Fe Mössbauer spectrometry ; XRD ; SEM ; Fe(II) determination
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Division of Materials Physics
Division of Organic Chemistry and Biochemistry
Projects:
Project titleProject leaderProject codeProject type
Utjecaj polimera na radiolitičku sintezu magnetskih nanočestica-POLRADNANOPTanja JurkinUIP-2017-05-7337HRZZ
Depositing User: Tanja Jurkin
Date Deposited: 01 Oct 2020 13:59
Last Modified: 10 Aug 2021 14:22
URI: http://fulir.irb.hr/id/eprint/5957
DOI: 10.3390/nano10091823

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