25th Croatian meeting of chemists and chemical engineers, Poreč, 2017.
Radiolytical synthesis of iron oxide nanoparticles in the presence of PEO, PVP,
CTAB and DEAE-dextran
Radiolitička sinteza nanočestica željezovih oksida u prisutnosti PEO-a, PVP-a,
CTAB-a i DEAE-dekstrana
Tanja Jurkin,1 Marijan Gotić2, Goran Štefanić,2 Irina Pucić1
1
Radiation Chemistry and Dosimetry Laboratory, Division of Materials Chemistry, Ruđer Bošković
Institute, Bijenička 54, Zagreb, Croatia
2
Center of Excellence for Advanced Materials and Sensing Devices, Research Unit New Functional
Materials, Ruđer Bošković Institute, Bijenička 54, Zagreb, Croatia
E-mail: [email protected]
Counts
Magnetic iron oxide nanoparticles (NPs) have applications as sensor, as contrast agents for
MR imaging, in drug delivery and for hyperthermia cancer treatments. γ-irradiation is a
powerful technique to synthesize NPs of controlled size and shape in solution, with
advantage of inducing solvated electrons and radicals, able to reduce metal ions,
homogeneously through the sample. The use of polymers or surfactants can influence the
nanoparticle size, morphology, stability and dispersivity. The goal of this work was to study
the influence of selected polymers/surfactant on the radiolytical synthesis of iron oxides.
Iron(III) precursor solutions were γ-irradiated in the presence of poly(ethylene oxide) (PEO),
polyvinylpyrrolidone
(PVP),
cetyltrimethylammonium
bromide
(CTAB)
and
diethylaminoethyl-dextran hydrochloride (DEAE-dextran) [1]. γ-irradiation of iron(III)
chloride/PEO aqueous solution produced rigid PEO hydrogels with embedded iron oxide NPs
(Fig. 1a). Addition of 2-propanol increased the reducing power of γ-irradiation resulting in
the formation of magnetite NPs (Fig. 1b); however 2-propanol reduced PEO crosslinking and
thus less rigid hydrogels or suspensions were formed. PVP in Fe(III) solution produced
magnetic suspension with a small amount of -FeOOH (feroxyhyte). γ-irradiation of
Fe(III)/CTAB aq. solution favoured the formation of rod-like goethite NPs (Fig. 1c).
Surprisingly, γ-irradiation of Fe(III)/DEAE-dextran aq. solution with 2-propanol produced
almost pure -FeOOH magnetic nanodiscs (Fig. 1d). This result present the first report of γirradiation synthesis of -FeOOH and the first report of obtaining -FeOOH in nanodisc
morphology [2].
1,5x10
6
1,5x10
6
1,5x10
6
1,5x10
6
1,5x10
6
1,5x10
6
1,5x10
6
1,5x10
6
-10
-5
0
Velocity / mm s
a)
b)
-1
5
10
100 nm
c)
100 nm
d)
100 nm
Figure 1: SEM images, photos and Mössbauer spectrum of different iron oxide nanoparticles and composite gel
prepared by γ-irradiation of Fe3+ aqueous solutions in the presence of PEO (a, b), CTAB (c) and DEAE-dextran
(d). Nanocomposite gel (a); magnetite NPs (b); rod-like goethite NPs (c); -FeOOH magnetic nanodiscs (d).
References
[1] T. Jurkin, M. Gotić, G. Štefanić and I. Pucić, Radiat. Phys. Chem. 124 (2016) 75-83.
[2] T. Jurkin, G. Štefanić, G. Dražić and M. Gotić, Mater. Lett. 173 (2016) 55-59.