The influence of oxidation process on exchange bias in egg-shaped FeO/Fe3O4 core/shell nanoparticles

Leszczyński, Błażej; Hadjipanayis, G. C.; El-Gendy, Ahmed A.; Załęski, Karol; Śniadecki, Z.; Musiał, A.; Jarek, Marcin; Jurga, Stefan; Skumiel, A.

doi:10.1016/j.jmmm.2016.05.023

Cited by 30 publications

(31 citation statements)

References 30 publications

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“…As pointed out by Chen et al 20 , the Wüstite phase is formed as consequence of reactions involving some commonly used hydrocarbon solvents and its formation contributes to significant cationic disorder. The later formation of the bimagnetic core-shell system due to the surface oxidation of Wüstite results in very distinct magnetic properties with respect to the monophasic nanoparticles [21][22][23][24][25][26] . Therefore, it is very important determine the factors that govern the core/shell nanoparticles formation to establish the reproducibility of this synthesis method and the magnetic response of the system.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

et al. 2018

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Magnetic, compositional and morphological properties of Zn-Fe-oxide core-shell bimagnetic nanoparticles (MNPs) were studied for three samples with 0.00, 0.06 and 0.10 Zn/Fe ratios, as obtained from Particle-Induced X-ray Emission analysis. The bimagnetic nanoparticles were produced in one step synthesis by the thermal decomposition of the respective acetylacetonates. The nanoparticles present an average particle size between 25-30 nm as inferred from Transmission Electron Microscopy (TEM). High-Resolution TEM images clearly show core-shell morphology for the particles in all samples. The core is composed by an antiferromagnetic (AFM) phase with Wüstite (Fe 1-y O) structure, while the shell is composed by Zn x Fe 3-x O 4 ferrimagnetic (FiM) spinel phase. Despite the low solubility of the Zn in the Wüstite, Electron energy-loss spectroscopy (EELS) analysis indicates that the Zn is distributed almost homogeneously in the whole nanoparticle. This result gives information on the formation mechanisms of the particle, indicating that the Wüstite is formed firstly, and the superficial oxidation results in the FiM ferrite phase with similar Zn concentration than the core. Magnetization and in-field Mössbauer spectroscopy of the Zn-richest nanoparticles indicate that the AFM phase is strongly coupled to the FiM structure of the ferrite shell, resulting in a bias field (H EB) appearing below T N FeO , with H EB values that depends on the core-shell relative proportion. Magnetic characterization also indicates a strong magnetic frustration for the samples with higher Zn concentration, even at low temperatures.

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Section: Introductionmentioning

confidence: 99%

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

et al. 2018

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“…The interfacial structure of the branch was investigated by HR-TEM analysis. As shown in Figure 2f, the spacing lattice fringe of 0.252, 0.245, and 0.492 nm were implied the presence of (110)Fe 2 O 3 planes, 30 (111) FeO(OH) planes, 31 and (111) magnetite planes, 32 respectively. Moreover, it has been found that the dendrimerlike structure was significantly affected by the Fe/biomass ratios.…”

Section: ■ Experimental Sectionmentioning

confidence: 93%

Novel Dendrimerlike Magnetic Biosorbent Based on Modified Orange Peel Waste: Adsorption–Reduction Behavior of Arsenic

Meng

Yang

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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In this work, a novel porous biosorbent (HF-D) based on orange peel (OP) was prepared by an efficient and simple method. The prepared HF-D showed well-ordered dendrimerlike structures and remarkable adsorption performance for the removal of arsenic. Particularly, morphology and structure details proved that the dendrimerlike structure was formed by surrounding the crystal iron nanoparticles with amorphous carbon. Furthermore, the influence of various environmental factors (initial pH, coexisting inorganic ions, humic substances, etc.) on the adsorption of As(V) was investigated. An extraordinary As(V) adsorption capacity (81.3 mg/g) has been observed when the Fe/biomass ratio was 10 wt %. Adsorption and characterization data proved that the behavior of As(V) on HF-D was an adsorption–reduction process, including complex adsorption and inner reduction. In addition, the adsorption kinetics and isotherms were analyzed. The regeneration and application in groundwater solution of the prepared HF-D were discussed. This study not only provides an efficient biosorbent for removing arsenic but also a low cost and environmentally friendly method for synthesizing porous biomass based materials.

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“…The metal oleate complex was prepared according to the procedure described by Leszczyński et al [36], mixing 30 mL of deionized water, 40 mL of ethanol 96%, 70 mL of hexane 96%, 3.25 g of anhydrous iron(III) chloride, and 18.25 g of sodium oleate. The resulting solution was heated to 60 • C and kept at that temperature for 5 h. The dark hydrophobic phase was separated in a separator funnel, washed with deionized water, and heated to 40 • C to evaporate hexane.…”

Section: Synthesis Of Iron(iii) Oleate Complexmentioning

confidence: 99%

Hydrophobically Coated Superparamagnetic Iron Oxides Nanoparticles Incorporated into Polymer-Based Nanocapsules Dispersed in Water

et al. 2020

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This paper reports the characterization of iron oxide magnetic nanoparticles obtained via the thermal decomposition of an organometallic precursor, which were then loaded into nanocapsules prepared via the emulsification process in the presence of an amphiphilic derivative of chitosan. The applied synthetic method led to the formation of a hydrophobic layer on the surface of nanoparticles that enabled their loading in the hydrophobic liquid inside of the polymer-based capsules. The average diameter of nanoparticles was determined to be equal to 15 nm, and they were thoroughly characterized using X-ray diffraction (XRD), magnetometry, and Mössbauer spectroscopy. A core-shell structure consisting of a wüstite core and maghemite-like shell was revealed, resulting in an exchange bias effect and a considerable magnetocrystalline anisotropy at low temperatures and a superparamagnetic behavior at room temperature. Importantly, superparamagnetic behavior was observed for the aqueous dispersion of the nanocapsules loaded with the superparamagnetic nanoparticles, and the dispersion was shown to be very stable (at least 48 weeks). The results were analyzed and discussed with respect to the potential future applications of these nanoparticles and nanocapsules based on biopolymers as platforms designed for the magnetically navigated transport of encapsulated hydrophobic substances.

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The influence of oxidation process on exchange bias in egg-shaped FeO/Fe3O4 core/shell nanoparticles

Cited by 30 publications

References 30 publications

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

Novel Dendrimerlike Magnetic Biosorbent Based on Modified Orange Peel Waste: Adsorption–Reduction Behavior of Arsenic

Hydrophobically Coated Superparamagnetic Iron Oxides Nanoparticles Incorporated into Polymer-Based Nanocapsules Dispersed in Water

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