The Contribution of 57Fe Mössbauer Spectrometry to Investigate Magnetic Nanomaterials

Grenèche, Jean‐Marc

doi:10.1007/978-3-642-32220-4_4

Cited by 30 publications

(18 citation statements)

References 177 publications

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“…Such line shape broadening typically results from a distribution in the θ angle between the applied field and the hyperfine field, which is opposite to the magnetic moment. The asymmetry appears similar to that expected of a system with a sperimagnetic structure [35], and in this case is consistent with a mean orientation of Fe 3+ moments in Fe 2 F 5 (Htaz) oriented in the opposite direction to the applied magnetic field. Such a structure differs from that observed in Fe 2 F 5 (H 2 O) 2 [34], but, at this stage, one does consider how the application of an external magnetic field and the cooling conditions affect the hyperfine structure of Fe 2 F 5 (Htaz).…”

Section: (C) Mössbauer Spectrometrysupporting

confidence: 85%

Strong magnetic exchange and frustrated ferrimagnetic order in a weberite-type inorganic–organic hybrid fluoride

Clark

Albino

Pimenta

et al. 2019

Phil. Trans. R. Soc. A.

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We combine powder neutron diffraction, magnetometry and 57 Fe Mössbauer spectrometry to determine the nuclear and magnetic structures of a strongly interacting weberite-type inorganic–organic hybrid fluoride, Fe 2 F 5 (H taz ). In this structure, Fe 2+ and Fe 3+ cations form magnetically frustrated hexagonal tungsten bronze layers of corner-sharing octahedra. Our powder neutron diffraction data reveal that, unlike its purely inorganic fluoride weberite counterparts which adopt a centrosymmetric Imma structure, the room-temperature nuclear structure of Fe 2 F 5 (H taz ) is best described by a non-centrosymmetric Ima 2 model with refined lattice parameters a = 9.1467(2) Å, b = 9.4641(2) Å and c = 7.4829(2) Å. Magnetic susceptibility and magnetization measurements reveal that strong antiferromagnetic exchange interactions prevail in Fe 2 F 5 (H taz ) leading to a magnetic ordering transition at T N = 93 K. Analysis of low-temperature powder neutron diffraction data indicates that below T N , the Fe 2+ sublattice is ferromagnetic, with a moment of 4.1(1) µ B per Fe 2+ at 2 K, but that an antiferromagnetic component of 0.6(3) µ B cants the main ferromagnetic component of Fe 3+ , which aligns antiferromagnetically to the Fe 2+ sublattice. The zero-field and in-field Mössbauer spectra give clear evidence of an excess of high-spin Fe 3+ species within the structure and a non-collinear magnetic structure. This article is part of the theme issue ‘Mineralomimesis: natural and synthetic frameworks in science and technology’.

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Section: (C) Mössbauer Spectrometrysupporting

confidence: 85%

Strong magnetic exchange and frustrated ferrimagnetic order in a weberite-type inorganic–organic hybrid fluoride

Clark

Albino

Pimenta

et al. 2019

Phil. Trans. R. Soc. A.

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“…This detailed characterization of magnetic properties by coupling VSM and 57 Fe Mö ssbauer spectrometry has never been reported so far for iron-oxide-MOF composites to the best of our knowledge, although the magnetic properties of pure maghemite and magnetite NPs were fully described in the last decades. [73][74][75][76][77][78] S13), thereby confirming two trends: (1) MIL/USPIO-cit particles appear more magnetic than g-Fe 2 O 3 -cit, whereas (2) MIL/USPIO particles seem to hold a smaller magnetic moment. These variations are significant but relatively small, and their explanation would require a dedicated investigation.…”

Section: Colloidal Stability Of Nano-objects In Physiologic Serum Conditionsmentioning

confidence: 63%

Maghemite-nanoMIL-100(Fe) Bimodal Nanovector as a Platform for Image-Guided Therapy

Sene

Marcos-Almaraz

Menguy

et al. 2017

Chem

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We describe the synthesis and characterization of a superparamagnetic nanoobject that consists of a mesoporous iron trimesate-based MOF (i.e., MIL-100(Fe)) whose surface is coated with maghemite nanoparticles. This nano-object combines excellent colloidal stability, low cytotoxicity, and high anti-tumoral activity. It can be used in vivo as an efficient MRI contrast agent because of its excellent relaxivity. All of these properties make this nano-object a potential candidate as a bimodal therapeutic nanovector coupling drug-delivery and MRI properties.

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“…Therefore, the formation of complexed/precipitated As species at the surface of the nano-Fe 3 O 4 adsorbent is one of the main adsorption mechanisms [ 93 , 101 , 102 ]. The p Ka values of As acid are p Ka 1 ≈ 2.3, p Ka 2 ≈ 7.0, and p Ka 3 ≈ 11.5, indicating that the molecular form mainly exists in a solution at a pH < 2.0, while the anionic species (H 2 AsO 4 − or HAsO 4 2− ) exists at a pH in the interval 2–10 [ 14 ]. At pH < pH p.z.c.…”

Section: In-detail Discussion Of the Adsorbent Propertiesmentioning

confidence: 99%

“…In particular, while Cornell et al [ 1 ] summarized very well the distinct crystallographic and magnetic properties of Fe 3 O 4 and γ-Fe 2 O 3 at a bulk state, Greneche [ 14 ] devoted decades to the study of nano-γ-Fe 2 O 3 and composites, including core–shell models. Regarding this issue, the present review has no intention to diminish previous findings and studies; instead, it invites the research community to have in mind the most important differences between both magnetic phases and, hence, their critical determination that is crucial in many applications.…”

Section: Introductionmentioning

confidence: 99%

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

2021

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Arsenic and lead heavy metals are polluting agents still present in water bodies, including surface (lake, river) and underground waters; consequently, the development of new adsorbents is necessary to uptake these metals with high efficiency, quick and clean removal procedures. Magnetic nanoparticles, prepared with iron-oxides, are excellent candidates to achieve this goal due to their ecofriendly features, high catalytic response, specific surface area, and pulling magnetic response that favors an easy removal. In particular, nanomagnetite and maghemite are often found as the core and primary materials regarding magnetic nanoadsorbents. However, these phases show interesting distinct physical properties (especially in their surface magnetic properties) but are not often studied regarding correlations between the surface properties and adsorption applications, for instance. Thus, in this review, we summarize the main characteristics of the co-precipitation and thermal decomposition methods used to prepare the nano-iron-oxides, being the co-precipitation method most promising for scaling up processes. We specifically highlight the main differences between both nano-oxide species based on conventional techniques, such as X-ray diffraction, zero and in-field Mössbauer spectroscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism, the latter two techniques performed with synchrotron light. Therefore, we classify the most recent magnetic nanoadsorbents found in the literature for arsenic and lead removal, discussing in detail their advantages and limitations based on various physicochemical parameters, such as temperature, competitive and coexisting ion effects, i.e., considering the simultaneous adsorption removal (heavy metal–heavy metal competition and heavy metal–organic removal), initial concentration, magnetic adsorbent dose, adsorption mechanism based on pH and zeta potential, and real water adsorption experiments. We also discuss the regeneration/recycling properties, after-adsorption physicochemical properties, and the cost evaluation of these magnetic nanoadsorbents, which are important issues, but less discussed in the literature.

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The Contribution of 57Fe Mössbauer Spectrometry to Investigate Magnetic Nanomaterials

Cited by 30 publications

References 177 publications

Strong magnetic exchange and frustrated ferrimagnetic order in a weberite-type inorganic–organic hybrid fluoride

Strong magnetic exchange and frustrated ferrimagnetic order in a weberite-type inorganic–organic hybrid fluoride

Maghemite-nanoMIL-100(Fe) Bimodal Nanovector as a Platform for Image-Guided Therapy

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

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