Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles

Omelyanchik, Alexander; Silva, Franciscarlos Gomes da; Gomide, Guilherme; Kozenkov, Ivan; Depeyrot, J.; Aquino, Renata; Campos, Alex Fabiano Cortez; Fiorani, D.; Peddis, Davide; Rodionova, Valeria; Jovanović, Sonja

doi:10.1016/j.jallcom.2021.160779

Cited by 27 publications

(14 citation statements)

References 56 publications

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“…The crystallite size (d XRD ) estimated using Scherrer's equation [37] The magnetic properties confirmed the change of the particle structure after H 2 reduction (Figure 2 and Table 1). At low temperatures (5 K), the CoFe 2 O 4 and (CoFe) 3 O 4 samples possessed a large coercivity (H C ), resulting from the high magnetic anisotropy of Co-ferrites, and a saturation magnetization (M S ) lower than the bulk value (90 Am 2 /kg for stoichiometric cobalt ferrite at 0 K [41]), owing to the large contribution of magnetically frustrated surface spins in small nanoparticles [28,42,43]. The coercivity rapidly reduced when measurements were performed at 300 K, due to thermal fluctuation occurring when the temperature approached the blocking temperature (T B , which was above room temperature for those samples) according to the following equation:…”

Section: Resultsmentioning

confidence: 99%

High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H2 Reduction of Co-Ferrites

et al. 2022

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Cobalt ferrite nanoparticles of different stoichiometries synthesized by a sol–gel autocombustion method were used as a starting material to obtain high-moment Fe50Co50 and Fe66Co34 metal nanoparticles by topochemical hydrogen reduction. Structural and magnetic investigations confirmed the formation of FeCo nanoparticles with crystallite sizes of about 30 nm and magnetization at 0.5 T of ~265 Am2/kg (0 K), which was larger than the expected bulk value, likely because of the incorporation in the body-centered cubic (bcc) FeCo structure of the residual C atoms present on the surface of the oxide particles. Temperature-dependent magnetization measurements in the H2 atmosphere were also performed to investigate in detail the reduction mechanism and the effect of an external magnetic field on the process efficiency.

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Section: Resultsmentioning

confidence: 99%

High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H2 Reduction of Co-Ferrites

et al. 2022

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“…of ferrites, including ferrites doped by other elements, are determined by the synthesis method, surface condition, chemical composition, size, etc. For instance, coercivity is determined by ferrite-doping elements, such as Co, Ni, and Zn, and by the structures' sizes [52][53][54][55][56]. In this case, coercivity can vary from units to hundreds of Oe.…”

Section: Resultsmentioning

confidence: 99%

Boron and Gadolinium Loaded Fe3O4 Nanocarriers for Potential Application in Neutron Capture Therapy

Korolkov

Zibert

Lissovskaya

et al. 2021

IJMS

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In this article, a novel method of simultaneous carborane- and gadolinium-containing compounds as efficient agents for neutron capture therapy (NCT) delivery via magnetic nanocarriers is presented. The presence of both Gd and B increases the efficiency of NCT and using nanocarriers enhances selectivity. These factors make NCT not only efficient, but also safe. Superparamagnetic Fe3O4 nanoparticles were treated with silane and then the polyelectrolytic layer was formed for further immobilization of NCT agents. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy dispersive X-ray (EDX), ultraviolet–visible (UV-Vis) and Mössbauer spectroscopies, dynamic light scattering (DLS), scanning electron microscopy (SEM), vibrating-sample magnetometry (VSM) were applied for the characterization of the chemical and element composition, structure, morphology and magnetic properties of nanocarriers. The cytotoxicity effect was evaluated on different cell lines: BxPC-3, PC-3 MCF-7, HepG2 and L929, human skin fibroblasts as normal cells. average size of nanoparticles is 110 nm; magnetization at 1T and coercivity is 43.1 emu/g and 8.1, respectively; the amount of B is 0.077 mg/g and the amount of Gd is 0.632 mg/g. Successful immobilization of NCT agents, their low cytotoxicity against normal cells and selective cytotoxicity against cancer cells as well as the superparamagnetic properties of nanocarriers were confirmed by analyses above.

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“…Such a size and degree of clustering can be partially tuned by the concentration and addition process of the stabilizer, which in this case can be compared to citric acid. 34,38 Here, the Rf-SPIONs were synthesized through a two-step process, which allowed the SPIONs to form clusters prior to introduction of Rf-citrate, which then work as a stabilizer to separate the SPIONs into smaller multicore structures.…”

Section: Resultsmentioning

confidence: 99%

Riboflavin–citrate conjugate multicore SPIONs with enhanced magnetic responses and cellular uptake in breast cancer cells

et al. 2022

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Effect of citric acid on the morpho-structural and magnetic properties of ultrasmall iron oxide nanoparticles

Cited by 27 publications

References 56 publications

High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H2 Reduction of Co-Ferrites

High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H2 Reduction of Co-Ferrites

Boron and Gadolinium Loaded Fe3O4 Nanocarriers for Potential Application in Neutron Capture Therapy

Riboflavin–citrate conjugate multicore SPIONs with enhanced magnetic responses and cellular uptake in breast cancer cells

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