Synthesis and Mössbauer study of iron oxalate coordination polymers of the type Fe(C2O4)(L)
                x
              (H2O)22−x

Abras, A.; Oliveira, Ester Figueiredo de

doi:10.1007/bf02395874

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…These Mössbauer parameters confirm the presence in the hydrogel of high-spin Fe 3+ . They are also similar to Mössbauer parameters of high-spin Fe 3+ ions in oxalates (δ between 0.35 mm/s and 0.41 mm/s and ΔE Q between 0.38 mm/s and 0.75 mm/s) [2][3][4][5] .…”

Section: Mössbauer Spectroscopysupporting

confidence: 71%

“…The 4.2-K Mössbauer spectrum of a similar sample of the iron-doped hydrogel that was electrochemically reduced to Fe 2+ showed a quadrupole doublet with δ = 1.37 mm/s and ΔE Q = 3.26 mm/s, which represents 85% of the iron in the sample. These parameters are typical of high-spin Fe 2+ and are comparable, although at the high end, of the Mössbauer parameters of Fe 2+ in oxalates [2][3][4][5] . This result confirms the efficiency of the reduction protocol.…”

Section: Mössbauer Spectroscopymentioning

confidence: 56%

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Manipulating Mechanical Properties with Electricity: Electroplastic Elastomer Hydrogels

et al. 2011

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Materials and Methods Hydrogel PreparationAll reagents were purchased from Sigma-Aldrich, unless otherwise noted, and were used as received. Poly(dimethylsiloxane) (PDMS) was commercially purchased locally, under the brand name GE Silicone II Kitchen & Bath. COOH-functionalized multi-walled carbon nanotubes (COOH-MWNTs, diameter: 8-15 nm, length: 10-50 μm, 2.56 % (w/w) functional content) were purchased from cheaptubes.com. Typical hydrogel preparationSodium acrylate (4.8 g, 51 mmol) and sodium (4-styrene sulfonate) (3.2 g, 14.3 mmol) were combined with 36 mL of deionized water and gently heated (< 40 C) until all solids were dissolved. Poly(ethylene glycol) diacrylate, (PEG-DA, M n = 575, 400 μL, 0.78 mmol) was added and the mixture was purged with N 2 for 5 min. Ammonium persulfate (APS, 72 mg, 0.47 mol%) was added as a radical initiator for copolymerization. Note: adjustments in PEG-DA stoichiometry relative to the other monomers produced hydrogels that were qualitatively stiffer (increased PEG-DA) or softer (decreased PEG-DA).Depending on the dimensions of the sample being prepared, 2 to 8 mL of the reaction mixture was pipetted into a mold. For electrochemical experiments the mold for the sample was created by temporarily affixing, using PDMS adhesive, a square glass cell to a Teflon base bearing a freshly polished glassy carbon electrode (GCE). The mold/sample combination was then heated at 85 °C for 1.5 h. After cooling to RT, the hydrogel was doped by simple submersion in either a solution of 2.0 M FeCl 2 /0.5 M citric acid or 2.0 M FeCl 3 /0.5 M citric acid for a period of 20-48 h (Supplementary Fig. S1). A 1:3 ratio by volume of doping solution to pre-polymer was used.

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Section: Mössbauer Spectroscopysupporting

confidence: 71%

Section: Mössbauer Spectroscopymentioning

confidence: 56%

Manipulating Mechanical Properties with Electricity: Electroplastic Elastomer Hydrogels

et al. 2011

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“…The first doublet shows isomer shift IS = 1.21 ± 0.01 mm/s and quadrupole splitting QSpl = 1.76±0.02 mm/s consistent with high-spin Fe(II). This result agrees with the data reported in[18,19]. The second doublet has IS = 1.04 ± 0.02 mm/s and QSpl = 1.98±0.04 mm/s.…”

supporting

confidence: 92%

Properties of Nanocrystalline Fe-Ni Particles Prepared by Thermal Reduction of Oxalate Precursors

ŠVÁBENSKÁ,

ROUPCOVÁ,

HAVLÍČEK

et al. 2023

NANOCON Conference Proeedings

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Recent technological advancements require development of cost-effective and high-performance magnets which ideally do not contain rare earth metals or noble metals. The promising candidates are Fe-Ni-based alloys, in particular, the Fe50Ni50 L10 phase (tetrataenite), which has a great perspective for producing hard magnetic materials. Our study explores a promising method for preparing nanoparticles of Fe-Ni alloy from an iron-nickel oxalate precursor. The coprecipitation method was employed to prepare oxalate precursors, followed by controlled thermal decomposition in a reducing hydrogen atmosphere. The morphology and properties of the resulting particles were analysed using scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and magnetic measurements.The SEM analysis revealed that the particles have approximately cube-shaped unit cell morphology with a size in a range of 1 -2 m. Upon annealing, the samples contain multiple phases with varying Fe-Ni content. Magnetic measurements confirmed the formation of magnetically suitable Fe-Ni phases in the samples after annealing. Mössbauer spectroscopy emerged as a highly effective method for characterizing individual phases of the Fe-Ni system.

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Natural iron oxalates and their analogous synthetic counterparts: A review

Baran

2016

Geochemistry

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Synthesis and Mössbauer study of iron oxalate coordination polymers of the type Fe(C2O4)(L) x (H2O)22−x

Cited by 4 publications

References 15 publications

Manipulating Mechanical Properties with Electricity: Electroplastic Elastomer Hydrogels

Manipulating Mechanical Properties with Electricity: Electroplastic Elastomer Hydrogels

Properties of Nanocrystalline Fe-Ni Particles Prepared by Thermal Reduction of Oxalate Precursors

Natural iron oxalates and their analogous synthetic counterparts: A review

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