Magnetic and resonance properties of ferrihydrite nanoparticles doped with cobalt

Stolyar, S. V.; Yaroslavtsev, R. N.; Исхаков, Р. С.; Bayukov, O. A.; Balaev, D. A.; Dubrovskiĭ, A. A.; Krasikov, A. A.; Ладыгина, В. П.; Воротынов, А. М.; Волочаев, М. Н.

doi:10.1134/s1063783417030301

Cited by 30 publications

(26 citation statements)

References 27 publications

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“…Analysis of the Mössbauer spectra obtained on an MC-1104Em spectrometer ( 57 Co(Cr) source) showed that the data for the obtained samples are in good agreement with the results reported in [31][32][33] and the annealing did not lead to the occurrence of foreign iron oxide phases. According to the transmission electron microscopy data, the average Bio-FH and Chem-FH particle size 〈d〉 was ~4 and ~5 nm, respectively.…”

Section: Fabrication and Characterization Of The Ferrihydrite Samplessupporting

confidence: 84%

“…The technique for preparing biogenic ferrihydrite formed by the Klebsiella oxytoca bacteria vital activity was described in detail in [31,32]. Chemical ferrihydrite was obtained by slow adding the NaOH (1 M) alkali solution to the FeCl 3 iron chloride solution (0.02 M) upon constant stirring at room temperature until obtaining the neutral pH value [33]. The prepared samples were annealed in air at 170°C for 24 h. These samples are hereinafter referred to as Bio-FH and Chem-FH.…”

Section: Fabrication and Characterization Of The Ferrihydrite Samplesmentioning

confidence: 99%

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Pulsed Field-Induced Magnetization Switching in Antiferromagnetic Ferrihydrite Nanoparticles

et al. 2018

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The dynamic magnetization switching of ferrihydrite nanoparticles has been investigated by a pulsed magnetometer technique in maximum fields H max of up to 130 kOe with pulse lengths of 4, 8, and 16 ms. Ferrihydrite exhibits antiferromagnetic ordering and defects cause the uncompensated magnetic moment in nanoparticles; therefore, the behavior typical of magnetic nanoparticles is observed. The dynamic hysteresis loops measured under the above-mentioned conditions show that the use of pulsed fields significantly broadens the temperature region of existence of the magnetic hysteresis and the coercivity can be governed by varying the maximum field and pulse length. This behavior is resulted from the relaxation effects typical of conventional ferro-and ferrimagnetic nanoparticles and the features typical of antiferromagnetic nanoparticles.

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Section: Fabrication and Characterization Of The Ferrihydrite Samplessupporting

confidence: 84%

Section: Fabrication and Characterization Of The Ferrihydrite Samplesmentioning

confidence: 99%

Pulsed Field-Induced Magnetization Switching in Antiferromagnetic Ferrihydrite Nanoparticles

et al. 2018

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“…Cobalt-doped chemical ferrihydrite samples were prepared at room temperature by slow adding the NaOH alakli solution to the iron chloride FeCl3 and cobalt (III) salt solution at continuous intermixing to attain the neutral рН value [12]. The precipitate was collected on a filter, washed, and dried at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The elemental distribution in particle aggregates was obtained from energy dispersive spectra (EDS) on a Hitachi TM 3000 microscope. The amount of Co atoms with respect to the amount of Fe atoms in the samples determined from the obtained EDS spectra was 18% [12]. Mössbauer spectra were measured on an МС-1104Еm spectrometer with the 57 Co(Cr) source at (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The controlled variation in the size of ferrihydrite nanoparticles, their defectness, and, consequently, magnetic properties is the urgent practical problem. In [12], we prepared ferrihydrite nanoparticle powders doped with cobalt in a ratio of Fe/Co= 5/1 by hydrolysis, determined their blocking temperatures, and established the particle size, magnetization, and surface and bulk anisotropy constants. The aim of this work was to investigate the modification of the magnetic properties of synthetic cobalt-doped ferrihydrite nanoparticles under heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Modification of the Structure and Magnetic Properties of Cobalt-Doped Ferrihydrite Nanoparticles Under Heat Treatment

Stolyar

Balaev

Krasikov

et al. 2017

J Supercond Nov Magn

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Nanoparticles of antiferromagnetic materials acquire the magnetic moment due to the surface effects and structural defects. According to the Neel hypothesis, magnetic moment P of a particle containing N magnetically active atoms with magnetic moment J can be estimated as P ~ J•N n or P ~ V n , where V is the particle volume. Numerous studies of the magnetic properties of ferrihydrite 5Fe2O3•9H2O and ferritin revealed a value of n ≈ ½ for this material, in which Fe atoms have the octahedral surrounding of anions. We investigate the effect of low-temperature annealing of cobalt-doped ferrihydrite nanoparticles on their average size and magnetic properties. Using the Mössbauer spectroscopy study, we demonstrate that doping with Со makes Fe atoms enter the anion tetrahedra, which leads to an increase in the exponent n > ½ in the expression P ~ J•N n .

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Coagulation removal of nickel (II) ions by ferric chloride: Efficiency and mechanism

Linnikov

Rodina

Захарова

et al. 2022

Water Environment Research

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Removal of heavy metal ions, in particular, divalent nickel ions from natural and wastewater, is of great importance for the environment. Nickel (II) ions are very toxic and provoke many diseases. The purpose of this work was to study the possibility of removing toxic nickel (II) ions from polluted water using an iron (III) chloride (FeCl3) coagulant. It is shown that the removal of nickel ions from aqueous solution by iron (III) hydroxide precipitate formed during the coagulation process at pH 7 and 8 is described with satisfactory accuracy by the classical adsorption isotherms of Freundlich, Langmuir, and Dubinin‐Radushkevich. The studies performed with the use of X‐ray powder diffraction and thermal analyses, IR, Raman, and Mössbauer spectroscopy have shown that the uptake of nickel ions by iron (III) hydroxide precipitate is due to simple physical adsorption and is not accompanied by the formation of mixed iron and nickel compounds. No alloying of the formed iron (III) hydroxide precipitate with nickel ions takes place either. The formed iron (III) hydroxide precipitate is a two‐line ferrihydrite having the gross formula Fe2O3 × 3H2O. Its sorption capacity for nickel ions is almost an order of magnitude higher than that of some mineral and carbon sorbents, and at pH 7 and 8, it is 60.5 and 141.9 mg/g, respectively. Practitioner Points Coagulant FeCl3 cleans contaminated solutions from Ni(II) ions. Iron (III) hydroxide precipitated at pH 7 and 8 is a two‐line ferrihydrite Fe2O3 × 3H2O. Removing of Ni(II) ions is described by classical adsorption isotherms. The most complete removal of Ni(II) ions occurs at pH = 8.

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Magnetic and resonance properties of ferrihydrite nanoparticles doped with cobalt

Cited by 30 publications

References 27 publications

Pulsed Field-Induced Magnetization Switching in Antiferromagnetic Ferrihydrite Nanoparticles

Pulsed Field-Induced Magnetization Switching in Antiferromagnetic Ferrihydrite Nanoparticles

Modification of the Structure and Magnetic Properties of Cobalt-Doped Ferrihydrite Nanoparticles Under Heat Treatment

Coagulation removal of nickel (II) ions by ferric chloride: Efficiency and mechanism

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