Synthesis and Characterization of Ferromagnetic Fe3O4–ZnO Hybrid Core–Shell Nanoparticles

Nishad, K. K.; Tiwari, Neha; Pandey, R. K.

doi:10.1007/s11664-018-6171-3

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…The core–shell nanoparticles, the core of which is made of magnetite and the shell of which is prepared from noble metals [ 13 ], polymers [ 14 , 15 , 16 ], or functional organic layers [ 17 , 18 ], possess unique magnetic properties accompanied by additional features such as optical responsive layers or bio function or specific reactivity, which is achieved due to the presence of hybrid particle core–shell morphology [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

et al. 2021

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In the presented paper, studies of magnetite nanoparticle stability in selected environmental solutions are reported. The durability tests were performed in four types of liquids: treated and untreated wastewater, river water, and commercial milk (0.5% fat). Nanoparticles before and after deposition in the testing conditions were measured by transmission electron microscopy, X-ray diffraction, infrared spectroscopy, and Mössbauer spectroscopy. The amount of Fe atoms transferred into the solutions was estimated on the basis of flame atomic absorption spectroscopy. The analysis of the obtained results shows good stability of the tested nanoparticles in all water solutions. They do not change their structure or magnetic properties significantly, which makes them a good candidate to be used as, for example, detectors of specific compounds or heavy metals. On the other hand, studies show that particles are stable in environmental conditions for a long period of time in an unchanged form, which can cause their accumulation; therefore, they may be hazardous to living organisms.

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Section: Introductionmentioning

confidence: 99%

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

et al. 2021

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“…However, due to the van der Waals forces of the magnetic, it is challenging to achieve monodispersed Fe 3 O 4 nanoparticles. Furthermore, quantitative data analysis revealed that the T B peak on the ZFC curves [53] tended to shift to a lower temperature value when the ratio of ZnO increased. Physically, this occurred due to the anisotropy energy barrier, which is proportional to thermal energy [50].…”

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confidence: 99%

Effects of ZnO nanoparticles on the antifungal performance of Fe₃O₄/ZnO nanocomposites prepared from natural sand

Taufiq

Ulya

Yogihati

et al. 2020

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In the present study, the eco-friendly and economical methods have been developed by employing natural iron sand as a main precursor to create Fe3O4/ZnO nanocomposites (NCs). The formation of Fe3O4/ZnO NCs was confirmed using XRD, synchrotron-based SAXS, FTIR spectroscopy, and SEM. The XRD results revealed that the Fe3O4 and ZnO crystallised spinel cubic and hexagonal wurtzite structures. The SAXS results exposed the construction of fractal dimension with the values of 3.20–3.70, which indicated a compact structure in 3-dimensions. The SEM images showed that the morphology of the samples tended to agglomerate in nanometric size. The FTIR spectra proved the presence of the Fe–O and Zn–O bonds as the main components of the NCs. The UV–vis spectroscopy analysis revealed that the bandgap energy of the Fe3O4/ZnO NCs ranged from 2.244 to 3.533 eV. Furthermore, the Fe3O4/ZnO NCs demonstrated superparamagnetic behaviour with the blocking temperature below 212 K, and their saturation magnetisation increased with increasing Fe3O4 content. Interestingly, all samples demonstrated excellent inhibitory performance against C. albicans, which indicates that the Fe3O4/ZnO NCs synthesised by eco-friendly and economical methods from natural iron sand for the first time are novel candidates for use as high-performance antifungal agents.

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“…The decreasing diffraction peak indicates that the crystallinity of the CoFe 2 O 4 /TiO 2 nanocomposites was inadequate compared to CoFe 2 O 4 . Meanwhile, the widening of the diffraction peak indicated that there were changes in the strain value of the nanoparticles [33]. The crystallite size can be theoretically calculated using the Scherrer formula, d c =Kλ/βcosθ, as shown in table 1.…”

Section: Resultsmentioning

confidence: 99%

High performance of magnetically separable and recyclable photocatalyst of green-synthesized CoFe₂O₄/TiO₂ nanocomposites for degradation of methylene blue

Puspitarum¹,

Istiqomah²,

Tumbelaka³

et al. 2022

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this study, combination of ferromagnetic and semiconductor CoFe2O4/TiO2 nanocomposites was synthesised using a green synthesis method with Moringa oleifera leaf extract to easily obtain a magnetically separated nanomaterial exhibiting high photocatalytic activity. Nanocomposites with different CoFe2O4/TiO2 molar ratios were identified using x-ray diffraction (XRD), transmission electron microscopy, X-ray fluorescence, Fourier transform infrared spectroscopy, UV–visible spectroscopy, and vibration sample magnetometer. The XRD spectrum confirmed the structure of the cubic spinel ferrite and anatase phases of CoFe2O4 and TiO2, respectively. The crystallite sizes of CoFe2O4, CoFe2O4/TiO2, and CoFe2O4/3TiO2 are 7.2 nm, 8.6 nm, and 11.1 nm, respectively. The magnetic hysteresis curve showed that CoFe2O4/TiO2 had a high saturation magnetisation of 27 emu g−1 and a coercivity of 200 Oe. The optical bandgap energy for CoFe2O4/TiO2 was in the range 3.6–3.8 eV. Photocatalytic investigations were carried out using methylene blue (MB) under UV irradiation. Our results showed an increase in MB degradation with increasing TiO2 concentration. The maximum photodegradations using nanocomposites are 60.8%, 97.7%, 98.4%, 98.5%, and 98.7% at molar ratios of 1:0, 1:1, 1:2, 1:3, and 1:4, respectively, after 20 min. The increase in MB degradation was related to the formation of internal structures between CoFe2O4 and TiO2. The magnetic nanocomposites enabled separation between the photocatalyst and final degraded solution using a permanent magnet. When the degradation was above 90%, the nanocomposites could be recycled three times.

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Synthesis and Characterization of Ferromagnetic Fe3O4–ZnO Hybrid Core–Shell Nanoparticles

Cited by 16 publications

References 33 publications

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

Effects of ZnO nanoparticles on the antifungal performance of Fe₃O₄/ZnO nanocomposites prepared from natural sand

High performance of magnetically separable and recyclable photocatalyst of green-synthesized CoFe₂O₄/TiO₂ nanocomposites for degradation of methylene blue

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Synthesis and Characterization of Ferromagnetic Fe3O4–ZnO Hybrid Core–Shell Nanoparticles

Cited by 16 publications

References 33 publications

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

Stability Studies of Magnetite Nanoparticles in Environmental Solutions

Effects of ZnO nanoparticles on the antifungal performance of Fe3O4/ZnO nanocomposites prepared from natural sand

High performance of magnetically separable and recyclable photocatalyst of green-synthesized CoFe2O4/TiO2 nanocomposites for degradation of methylene blue

Contact Info

Product

Resources

About

Effects of ZnO nanoparticles on the antifungal performance of Fe₃O₄/ZnO nanocomposites prepared from natural sand

High performance of magnetically separable and recyclable photocatalyst of green-synthesized CoFe₂O₄/TiO₂ nanocomposites for degradation of methylene blue