Preparation and characterization of spinel SrFe2O4 nanoparticles by method sol-gel

Ghahfarokhi, S. E. Mousavi; Shobegar, E. Mohammadzadeh; Shoushtari, Morteza Zargar

doi:10.1007/s41779-021-00633-x

Cited by 9 publications

(6 citation statements)

References 39 publications

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“…In the sample treated at 700 °C, the grains that make up the sample are all the same, producing a very uniform surface with agglomerated From Table 3, it is possible to observe that with the increase in treatment temperature, the grain size increases, and the samples become less porous, showing a similar behavior to those reported in the literature [1]. In the sample treated at 700 • C, the grains that make up the sample are all the same, producing a very uniform surface with agglomerated grains, as described in the literature [35]. As the temperature of the heat treatment increases, grains with different shapes and sizes begin to appear.…”

Section: Resultssupporting

confidence: 78%

“…Conductivity AC increases with increasing frequency in all samples (Figure 7) at a temperature of 300 K, which is in line with the literature [35,42,43]. Conductivity is related to the number of charge carriers that respond to changes in frequency and temperature [43].…”

Section: Samples Micrography Eds Mapsupporting

confidence: 90%

“…This phenomenon was not verified in the analyzed samples (Figure 6a,b). In our work, in the case of the dielectric constant, the opposite was observed since, for a frequency of 1 kHz, the sample that presents the highest dielectric constant is According to the literature [35], with the increase in the treatment temperature, an increase in the dielectric constant and dielectric losses occurs [35], and this behavior is also observed in other ferrites. This phenomenon was not verified in the analyzed samples (Figure 6a,b).…”

Section: Samples Micrography Eds Mapmentioning

confidence: 45%

“…Dielectric losses may increase with frequency and then decrease, resulting in a process of dielectric relaxation. Based on the literature [35,39], this behavior is common to ferrites since, from a certain frequency, the exchange of electrons cannot follow the variation of the applied electric field; that is, the polarization of the material cannot follow the direction in which the field it is applied, resulting in a decrease in the ε r ′ [35,39]. According to the literature [35], with the increase in the treatment temperature, an increase in the dielectric constant and dielectric losses occurs [35], and this behavior is also observed in other ferrites.…”

Section: Samples Micrography Eds Mapmentioning

confidence: 99%

“…Based on the literature [35,39], this behavior is common to ferrites since, from a certain frequency, the exchange of electrons cannot follow the variation of the applied electric field; that is, the polarization of the material cannot follow the direction in which the field it is applied, resulting in a decrease in the ε r ′ [35,39]. According to the literature [35], with the increase in the treatment temperature, an increase in the dielectric constant and dielectric losses occurs [35], and this behavior is also observed in other ferrites. This phenomenon was not verified in the analyzed samples (Figure 6a,b).…”

Section: Samples Micrography Eds Mapmentioning

confidence: 99%

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Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Soreto Teixeira,

Ferreira,

Carvalho

et al. 2024

Crystals

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This work proposes the synthesis of strontium ferrite by two different methods: sol-gel (SG), using powdered coconut water (PCW) as a precursor, and laser floating zone (LFZ). The SG samples were after treated at temperatures of 700, 1000, and 1200 °C, while the samples obtained by LFZ were grown at pulling rates of 10, 50, and 100 mm/h. All samples studied were subjected to structural characterization techniques, as well as electrical (AC and DC) and magnetic characterization. Through X-ray diffraction, it was possible to observe that all the samples presented strontium ferrites, but none were single phase. The phases detected in XRD were confirmed by Raman spectroscopy. Scanning electron micrography allowed the observation of an increase in grain size with the temperature of SG samples and the reduction of the porosity with the decrease in growth rate for LFZ fibers. Through electrical analysis, it was observed that the most suitable samples for energy storage were the samples grown at 100 mm/h (εr′ = 430,712; εr″ = 11,577; tan δ = 0.84; σac = 0.0006 S/m, at 1 kHz). The remaining samples had high dielectric losses and can be applied in electromagnetic shielding. The SG 700 °C sample presented the highest magnetization (38.5 emu/g at T = 5 K).

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Section: Resultssupporting

confidence: 78%

Section: Samples Micrography Eds Mapsupporting

confidence: 90%

Section: Samples Micrography Eds Mapmentioning

confidence: 45%

Section: Samples Micrography Eds Mapmentioning

confidence: 99%

Section: Samples Micrography Eds Mapmentioning

confidence: 99%

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Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Soreto Teixeira,

Ferreira,

Carvalho

et al. 2024

Crystals

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Novel cytotoxicity study of strontium (Sr) doped iron oxide (Fe3O4) nanoparticles aided with ibuprofen for drug delivery applications

Din

Khan

Gul

et al. 2023

Naunyn-Schmiedeberg's Arch Pharmacol

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PurposeThis work aimed to study the drug delivery applications of iron oxide (Fe 3 O 4 ) nanoparticles with strontium (Sr) doping with varying molar ratios prepared by the co-precipitation route. The impact of increased strontium content on the particle size and magnetic properties was investigated. The impending of these nanoparticles for drug loading, drug release, and their respective cytotoxicity was also inspected. MethodsFirst, iron oxide nanoparticles were doped with various amounts of strontium, from 0.25, 0.50, and 0.75, to 1 mole using co-precipitation method. These synthesized nanoparticles were characterized by XRD, SEM, EDX, VSM, and FTIR for evaluating crystal structure, phase purity, morphology, composition, magnetic properties, and functional groups, respectively. Drug loading and drug release properties were determined using UV-vis spectroscopy, whereas MTT assay evaluated cytotoxicity. ResultsThe ndings con rmed the successful doping of iron oxide with strontium via XRD and EDX. SEM results con rmed spherical morphology for all and needle-like structure for 1 mole strontium doped sample. For VSM results, a single domain structure was established. It was also observed that the drug encapsulation e ciency increases with increased strontium content. Cytotoxicity results by MTT assay revealed increased cytotoxicity with increasing nanoparticle concentration, and ibuprofen-loaded nanoparticles showed higher cytotoxicity than unloaded nanoparticles at the same concentration. ConclusionThis study provided predominantly comparison of the cytotoxicity of ibuprofen-loaded and non-loaded nanoparticles on Hep-2 cancer cells at similar concentrations for the rst time for both Fe 3 O 4 particles and Sr-doped Fe 3 O 4 nanoparticles and enclosed the impact of increasing Sr doping content on Fe 3 O 4 nanoparticles.

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Effects of B-site substitution of SrFe2O4 oxygen carrier on the biomass chemical looping gasification performance

Lu,

Pu,

Gao

et al. 2024

Biomass Conv. Bioref.

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Preparation and characterization of spinel SrFe2O4 nanoparticles by method sol-gel

Cited by 9 publications

References 39 publications

Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Novel cytotoxicity study of strontium (Sr) doped iron oxide (Fe3O4) nanoparticles aided with ibuprofen for drug delivery applications

Effects of B-site substitution of SrFe2O4 oxygen carrier on the biomass chemical looping gasification performance

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