Comparative study on the physical properties of rare-earth-substituted nano-sized CoFe2O4

Ateia, Ebtesam E.; Abdelmaksoud, M.; Arman, M. M.; Shafaay, Amira S.

doi:10.1007/s00339-020-3282-5

Cited by 51 publications

(16 citation statements)

References 37 publications

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“…Spinel CoCuFe 4 O 8 was synthesized using the modified citrate auto combustion technique [28][29][30]. The metal nitrates Fe (NO 3 ) 3 .9H 2 O, Co (NO 3 ) 2 .6H 2 O, Cu (NO 3 ) 2 .6H 2 O and citric acid were used as starting materials.…”

Section: Methodsmentioning

confidence: 99%

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

et al. 2020

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Polymer-inorganic nanocomposites with systematized structure provide a novel composite material having complementary between the polymer and inorganic materials. A new CoCuFe 4 O 8 spinel ferrite was prepared by a modified citrate auto combustion technique. The formation of the core-shell structure by coating CoCuFe 4 O 8 nanoparticles (NPs) with Polyethylene glycol (PEG) or Polyacrylamide (PAM) was successfully proceeding. The X-ray diffraction analysis shows that the prepared sample crystallizes in a cubic crystal structure with the Fd3m space group. The structural changes are elucidated via diametrical size, lattice parameter, dislocation density and strain. The obtained data reveals that after coating with PEG/ PAM the crystallite size of CoCuFe 4 O 8 spinel ferrite nanoparticles decreases while, the dislocation density increases. The dislocation density provides more energy-friendly locations for nucleation, consequently, the crystallinity deteriorates and the crystal grains become finer. High-Resolution Transmission Electron Microscopy (HRTEM) images ratify that the spinel nanoparticles are embedded in the PEG/PAM matrix forming the core-shell structure. The measurements of the magnetic hysteresis loops assure that all prepared samples exhibit a hard ferrite nature with a coercivity ranging from 1525 to 1512 Oe. The decrease of the magnetic parameters of CoCuFe 4 O 8 /PEG-PAM can be explained on the basis of the contribution of the non-magnetic coating layer to the total magnetization. The total magnetic behavior of the nanocomposites can be tuned and tailored depending on the coating layers. Based on the obtained data, the formulated CoCuFe 4 O 8 decorated with PEG-PAM can be recognized as a promising functional material for applications in biomedicine. The enhanced magnetic properties make CoCuFe 4 O 8 /PEG-PAM a fitting candidate in the high-density recording.

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Section: Methodsmentioning

confidence: 99%

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

et al. 2020

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“…Then, the resultant samples were rinsed and dried using ethanol at different concentrations. Next, the bacterial cells were put on the Al stubs and dried inside the desiccator followed by the Au coating for the SEM measurements [19].…”

Section: Morphology Characterization Of Cdmznsfs-treated Bacteriamentioning

confidence: 99%

“…According to Rezlucu et al [15], the trivalent rare earth impurities due to their large ionic radii and exceptional 4f shell electronic configurations can be the excellent substituents in the lattice structures of the soft MZNSFs, thereby improving their structural, optical, magnetic and electrical traits. The rare earth ions substitutions in the MZNSFs leads to the development of a strong exchange coupling between the 4f and 3d electrons, contributing to the significant magnetocrystalline anisotropy in the spinel structures and physical properties improvement [16][17][18][19]. In this perception, we used the sonochemical method to synthesize some new types of MZNSFs with Ce 3+ and Dy 3+ co-substitutions for the first time.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties, anticancer and antibacterial effectiveness of sonochemically produced Ce3+/Dy3+ co-activated Mn-Zn nanospinel ferrites

Almessiere

Slimani

Rehman

et al. 2020

Preprint

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Some new types of Ce3+ and Dy3+ co-doped manganese-zinc nanospinel ferrites (CDMZNSFs) of the form (Mn0.5Zn0.5)[Fe2 − 2xCexDyx]O4 (with 0.0 ≤ x ≤ 0.1) were sonochemically produced and characterized. The structure, morphology, optical and magnetic behaviors of these NSFs were determined as a function of co-dopant (Ce3+ and Dy3+) contents. In addition, the bactericidal (on the gram-positive and gram-negative bacterial strains) and anti-cancerous effectiveness of these NSFs were assessed. The cancer cells' growth inhibitory action of these NSFs was tested against both normal (HEK-293) and cancerous (HCT-116) human cells. The direct optical band gap energies of the studied NSFs were ranged from 1.54 to 1.85 eV. The measured hysteresis loop and temperature-dependent magnetization of the NSFs disclosed a phase transformation from the superparamagnetic (SPM) at room temperature (RT) to ferromagnetic (FM) below the blocking temperature (TB). The saturation magnetization and TB were decreased with the increase in co-dopant contents. After 48 h of treatment of the cancerous cells with the NSFs, their population was significantly dropped as shown by the MTT assay, indicating the selective inhibition of the cancer cells growth by the proposed NSFs. Conversely, the non-cancerous cells (HEK-293) population remained unaffected. The IC50 values of the NSFs-treated cancerous cells (HCT-116) were in the range of 0.74–2.35 µg/mL. The results of the MIC and MBC assays revealed the reasonable antibacterial efficacy (growth inhibitory activity) of these NSFs when tested against the E. coli and S. aureus bacterial strains. It is established that the proposed Ce3+/Dy3+ co-activated CDMZNSFs may be beneficial for the anti-cancerous and bactericidal applications.

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Section: Introductionmentioning

confidence: 99%

“…Several reports have been published on the effect of the substitution of Co 2+ in cobalt ferrite with rare earth and transition metal ions [12][13][14][15]. The presence of rare earth (RE) elements influences its structural and magnetic properties [12]. The large ionic radii and highly localized magnetic moments of 4f electrons of the lanthanides is expected to influence the anisotropy due to the strong spin-orbit coupling and also to cause structural distortion [13,14].…”

Section: Introductionmentioning

confidence: 99%

Soft Chemistry Synthesis and Characterization of CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) Ferrite

et al. 2022

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Nanosized CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) ferrites were obtained through wet ferritization method. These ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM/HR-TEM), Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy and magnetic measurements. The XRD results revealed that the average crystallite size is 5.77 nm for CoFe1.8Tb0.2O4 and 6.42 nm for CoFe1.8Er0.2O4. Distribution of metal cations in the spinel structure estimated from X-ray diffraction data showed that the Tb3+ and Er3+ ions occupy the octahedral sites. TEM images indicated the presence of polyhedral particles with average size 5.91 nm for CoFe1.8Tb0.2O4 and 6.80 nm for CoFe1.8Er0.2O4. Room temperature Mössbauer spectra exhibit typical nanoscaled cobalt ferrite spectra in good agreement with XRD and TEM data. The saturation magnetization value (Ms) is 60 emu/g for CoFe1.8Tb0.2O4 and 80 emu/g for CoFe1.8Er0.2O4. CoFe1.8RE0.2O4 nanoparticles showed similar antimicrobial efficacy against the five tested microbial strains, both in planktonic and biofilm state. The results highlight the promising potential of these types of nanoparticles for the development of novel anti-biofilm agents and materials.

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Comparative study on the physical properties of rare-earth-substituted nano-sized CoFe2O4

Cited by 51 publications

References 37 publications

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe4O8 ferrite nanoparticles

Magnetic properties, anticancer and antibacterial effectiveness of sonochemically produced Ce3+/Dy3+ co-activated Mn-Zn nanospinel ferrites

Soft Chemistry Synthesis and Characterization of CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) Ferrite

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