Room temperature Mössbauer characterization of ferrites with spinel structure

Wang, Jing; Wu, Haiyan; Yang, Caiqin; Lin, Ying‐Chu

doi:10.1016/j.matchar.2008.03.013

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…ions at octahedral sites [9]. The isomer shift and magnetic field values are in good agreement with previous reports [10][11][12]. Mössbauer spectrum of Fe/Ce/Cu exhibits additional two peaks at velocity of 1.5 mm/s along with the two 6-line magnetic hyperfine structures.…”

Section: Resultssupporting

confidence: 91%

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Reddy

Smirniotis

2010

Catal Lett

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Section: Resultssupporting

confidence: 91%

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Reddy

Smirniotis

2010

Catal Lett

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“…The spectrum of compounds with the spinel structure is fitted using two sextets denoted as A and B sites, in which the fractions of iron ions are directly determined by the relative area ratios of the subspectra of corresponding A and B, respectively. 28 The outer sextet corresponding to a higher magnetic field (H A ) is attributed to Fe 3+ at the A site, and the inner sextet corresponding to the lower magnetic field (H B ) is from Fe 2+ and Fe 3+ ions at the B site. The molar ratios of Fe 3+ at the A site to B site were calculated to be about 0.67 and 0.78 for E15 and E20, respectively, which were about 0.81 and 0.85 by XPS.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It can be found that the spectra exhibit a superposition of two Zeeman sextets for samples E15 and E20. The spectrum of compounds with the spinel structure is fitted using two sextets denoted as A and B sites, in which the fractions of iron ions are directly determined by the relative area ratios of the subspectra of corresponding A and B, respectively . The outer sextet corresponding to a higher magnetic field ( H A ) is attributed to Fe 3+ at the A site, and the inner sextet corresponding to the lower magnetic field ( H B ) is from Fe 2+ and Fe 3+ ions at the B site.…”

Section: Resultsmentioning

confidence: 99%

Zn-Doped Fe₃O₄ Nanosheet Formation Induced by EDA with High Magnetization and an Investigation of the Formation Mechanism

Zhu

Nan

2017

J. Phys. Chem. C

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Ethylenediamine (EDA) was always used as an additive to modify nanomaterial formation. However, the effect of EDA on the nanomaterial formation process has not been studied in detail. In the present study, Zn-doped Fe3O4 magnetic nanosheets with a high magnetization and surface area were synthesized by a facile one-step solvothermal method, where EDA was added to the reaction system. The formation mechanism was first studied in detail by using an in situ calorimetric method. Compared to Zn-doped Fe3O4 clusters synthesized by the same method without EDA, the complex formation, as [Fe(EDA)3]3+ and [Zn(EDA)3]2+, prevented alkoxide (Fe2(C2H4O2)3 and ZnC2H4O2) formation and resulted in some reactions occurring at higher temperature. At the same time, the (111) facets of Zn-doped Fe3O4 became stable, which resulted in nanosheet formation. And the effect of EDA on the magnetization of the sample can be explained by the Zn2+ distributions at the tetrahedral (A site) and octahedral (B site) sites. These results demonstrated further that the EDA can change the Zn-doped Fe3O4 formation mechanism, which has not been reported before as we know.

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“…Mössbauer spectra of naked nanoparticles and aminesilanized nanoparticles are shown on figures 2(D) and (F), respectively. The Mössbauer spectrum for MNP was fitted using only two crystalline iron sites associated to Fe 2+ and Fe 3+ related to octahedral and tetrahedral iron sites (Cabrera et al 2013, Wang et al 2008. However, Mössbauer spectra of amine-silanized nanoparticles was fitted using three crystalline iron sites and a distribution of non-equivalent iron sites fitted by a hyperfine field distribution.…”

Section: Synthesis and Physico-chemical Characterization Of Coated Ma...mentioning

confidence: 99%

Synthesis, characterization and bio-functionalization of magnetic nanoparticles to improve the diagnosis of tuberculosis

et al. 2020

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Mycobacterium tuberculosis is the cause of one of the diseases with the highest mortality and morbidity rate in the Americas and in the world. In developing countries, the diagnosis of tuberculosis (TB) is based on baciloscopy and bacteriological cultures. The first method has a low sensitivity, and the second can take several weeks to reach a confirmatory diagnosis. The lack of a rapid diagnosis compromises the efforts to control this disease and favors the transmission of tuberculosis to the susceptible population. In this work, we present the synthesis, amine-silanization, characterization and bio-functionalization of magnetic nanoparticles (MNPs) to develop a sandwich ELISA to detect and concentrate antigens from M. tuberculosis. For this purpose, a recombinant mycobacterial heat shock protein Hsp16.3, which contributes to the persistence of TB, was cloned and expressed in the E. coli system. Polyclonal antibodies anti-Hsp16.3 were produced in a rabbit and in mice. Magnetic nanoparticles were synthesized by co-precipitation, amine-functionalized and characterized by several physical-chemical methods. The XRD, Mossbauer spectroscopy, zeta potential, TEM, and FTIR all proved the successful preparation of the MNPs showing a diffraction crystal diameter of 10.48 ± 2.56 nm, superficial net charge of : +23.57 ± 2.87 mV, characteristic patterns of magnetite and a structure similar to a sphere. Additionally, it showed a magnetization saturation of 37.06 emu.g−1. For the functionalization of nanoparticle surfaces with anti-Hsp16.3, the active ester method was used for bond formation, and parameters such as time of incubation, coupling agents ratio (EDC/NHS) and concentration as well as surface saturation level of amine-silanized MNPs (MNP@Si@NH2) were standardized. Finally, bio-functionalized MNPs were used to detect, fix and concentrate the recombinant antigen Hsp16.3 from M. tuberculosis in a sandwich ELISA-MNP assay.

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Room temperature Mössbauer characterization of ferrites with spinel structure

Cited by 14 publications

References 12 publications

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Zn-Doped Fe₃O₄ Nanosheet Formation Induced by EDA with High Magnetization and an Investigation of the Formation Mechanism

Synthesis, characterization and bio-functionalization of magnetic nanoparticles to improve the diagnosis of tuberculosis

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Room temperature Mössbauer characterization of ferrites with spinel structure

Cited by 14 publications

References 12 publications

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Effect of Copper as a Dopant on the Water Gas Shift Activity of Fe/Ce and Fe/Cr Modified Ferrites

Zn-Doped Fe3O4 Nanosheet Formation Induced by EDA with High Magnetization and an Investigation of the Formation Mechanism

Synthesis, characterization and bio-functionalization of magnetic nanoparticles to improve the diagnosis of tuberculosis

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Zn-Doped Fe₃O₄ Nanosheet Formation Induced by EDA with High Magnetization and an Investigation of the Formation Mechanism