Study of the nanostructures obtained by low-temperature hydrogen reduction of iron hydroxide

Тананаев, И. Г.; Baldokhin, Yu. V.; Korneev, V. P.; Kovalenko, L. V.; Suzdalev, I. P.; Prusakov, V. E.; Arsent’eva, I. P.; Folmanis, G. E.

doi:10.1134/s1028335811020054

Cited by 3 publications

(3 citation statements)

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“…Sextet 1, with the largest IS value of 0.63 mm/s, arose due to the presence of Fe 2+ cations confirming the Fe 3 O 4 phase of PSDA@Fe 3 O 4 magnetic microspheres. 39,40 The magnetic hyperfine field values for tetrahedral A sites (46.61 T) and octahedral B sites (38.51 T) were smaller than the bulk values but comparable to the values reported previously for magnetite nanoparticles. The ratio of the relative intensities due to the iron ions at the tetrahedral A site to octahedral B site was 0.59, which was higher than that of the theoretical value of 0.50.…”

Section: ■ Results and Discussionsupporting

confidence: 84%

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Carboxyl-Assisted Coordination-Driven Self-Assembly for the Preparation of Magnetic Polymer Composite Microspheres

Ren,

Yan,

et al. 2024

ACS Appl. Polym. Mater.

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Magnetic polymer composite microspheres (MPCMs) with biocompatible coatings are increasingly being recognized as promising candidates for biologic separation, immunoassays, and drug delivery systems. Notwithstanding, conventional preparation methods primarily involve the simple stacking or disordered assembly of magnetic particles. In this study, carboxylate ligands of the poly(styrene-alt-maleic acid) sodium salt (PSMA-Na) facilitate the self-assembly preparation of PSDA@Fe 3 O 4 composite microspheres through bidentate bridging coordination to surface metal ions of Fe 3 O 4 . The critical role of carboxyl groups within the amphiphilic alternating copolymer PSMA-Na can be determined so that (1) these can help to establish strong coordination bonds with Fe 3 O 4 , serving as a bridge between the magnetic nanoparticles and the polymer material, thereby facilitating the capture of magnetic components; (2) more intriguingly, the magnetic materials within this system undergo a self-assembly process transitioning from the core to the shell, where the strong coordination effect of carboxyl groups results in the formation of a core−shell structure with Fe 3 O 4 uniformly dispersed on the surface of polymer microspheres. Consequently, the PSDA@Fe 3 O 4 microspheres produced exhibit controllable particle size, high magnetic loading, and excellent biocompatibility, presenting potential biomaterial applications in magnetic resonance imaging and drug delivery systems. Significantly, this self-assembly method is straightforward, swift, and widely applicable to nanoparticles and carboxylate organic molecules, offering insights and inspiration for synthesizing additional composite materials.

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Section: ■ Results and Discussionsupporting

confidence: 84%

“…In the octahedral sites, the IS for Fe 3+ was measured to be 0.32 mm/s. Sextet 1, with the largest IS value of 0.63 mm/s, arose due to the presence of Fe 2+ cations confirming the Fe 3 O 4 phase of PSDA@Fe 3 O 4 magnetic microspheres. , …”

Section: Resultsmentioning

confidence: 77%

Carboxyl-Assisted Coordination-Driven Self-Assembly for the Preparation of Magnetic Polymer Composite Microspheres

Ren,

Yan,

et al. 2024

ACS Appl. Polym. Mater.

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“…Our experiments allowed us to present a possible scheme of structural transformations (cor rected compared with our earlier data [24]) that occurred in the reduction of iron hydroxide. The scheme includes reaction branching (bifurcations), Passivation layers and inclusions of residual phases are formed during reduction.…”

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confidence: 97%

A study of nanostructures formed in the hydrogen reduction of Fe(OH)3

Baldokhin

Suzdalev

Prusakov

et al. 2012

Russ. J. Phys. Chem. B

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A complex study of the hydrogen reduction of nanosized iron hydroxide Fe(OH) 3 at 400°C was performed. It was shown that, during the reduction of Fe(OH) 3 to iron metal α Fe, intermediate compounds such as Fe(OH) 2 , α FeOOH, β FeOOH, γ FeOOH, δ FeOOH, and FeO are formed along with stable iron oxides α Fe 2 O 3 , γ Fe 2 O 3 , and Fe 3 O 4 . A scheme of chemical and structural transformations that occur in the reduction of nanosized Fe(OH) 3 is presented. The scheme takes into account the possibility of the bifurcation mechanism of reaction development.

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One-Pot Synthesis of Highly Monodispersed Ferrite Nanocrystals: Surface Characterization and Magnetic Properties

Verma

Dhanapal

2011

Langmuir

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In the present study, a facile one-pot synthetic route, utilizing a strong polar organic solvent, N-methyl 2-pyrrolidone (NMP), is demonstrated to obtain highly monodispersed ferrite nanocrystals. The equimolar mixture of oleic acid, C(17)H(33)COOH (R-COOH), and oleylamine, C(18)H(35)NH(2) (R'-NH(2)), was used to coat the magnetic nanocrystals. Structural and magnetic properties of the ferrite nanocrystals were studied by a multitechnique approach including X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM), and Mössbauer spectroscopy. FTIR spectral analysis indicates oleylamine helps in deprotonation of oleic acid, resulting in the formation of an acid-base complex, R-COO¯:NH(3)(+)-R', which acts as binary capping agent. Structural and coordination differences of iron were studied by XPS and Mössbauer spectral analysis. XPS analysis was carried out to examine the oxidation state of iron ions in iron oxide nanocrystals. The presence of a magnetically dead layer (∼0.38 and ∼0.67 nm) and a nonmagnetic organic coating (∼2.3 and ∼1.7 nm) may substantially reduce the saturation magnetization values for CoFe(2)O(4) and Fe(3)O(4) nanocrystals, respectively. The energy barrier distribution function of magnetic anisotropy was derived from the temperature dependent decay of magnetization. A very narrow energy barrier distribution elucidates that the ferrite nanocrystals obtained in this study are highly monodispersed.

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Study of the nanostructures obtained by low-temperature hydrogen reduction of iron hydroxide

Cited by 3 publications

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Carboxyl-Assisted Coordination-Driven Self-Assembly for the Preparation of Magnetic Polymer Composite Microspheres

Carboxyl-Assisted Coordination-Driven Self-Assembly for the Preparation of Magnetic Polymer Composite Microspheres

A study of nanostructures formed in the hydrogen reduction of Fe(OH)3

One-Pot Synthesis of Highly Monodispersed Ferrite Nanocrystals: Surface Characterization and Magnetic Properties

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