Production of Gadolinium Iron Garnet by Anion Resin Exchange Precipitation

Сайкова, С. В.; Киршнева, Е. А.; Пантелеева, М. В.; Пикурова, Е. В.; Evsevskaya, N. P.

doi:10.1134/s0036023619100127

Cited by 9 publications

(7 citation statements)

References 17 publications

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“…The precipitation of metal hydroxides occurs at the resin-solution interface, namely on the resin beads. When the thickness of the surface deposit reaches 1-1.5 µm, it is exfoliated, and an individual product phase forms [39,40]. We used a polysaccharide, dextran-40, to obtain homogeneous nanoparticles with similar sizes and morphologies.…”

Section: Resultsmentioning

confidence: 99%

“…This process is conducted under easily controllable stationary conditions and allows obtaining homogeneous nanoparticles with uniform size and morphology without impurity ions. This method eliminates the use of expensive equipment and multiple washing steps [39,40]. The anion-exchange resin precipitation is conducted in the solution containing dextran-40 to prevent the aggregation of the as-obtained magnetic nanoparticles and control the particle size.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

Сайкова

Pavlikov

Трофимова

et al. 2021

Metals

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During the past few decades, hybrid nanoparticles (HNPs) based on a magnetic material and gold have attracted interest for applications in catalysis, diagnostics and nanomedicine. In this paper, magnetic CoFe2O4/Au HNPs with an average particle size of 20 nm, decorated with 2 nm gold clusters, were prepared using methionine as a reducer and an anchor between CoFe2O4 and gold. The methionine was used to grow the Au clusters to a solid gold shell (up to 10 gold deposition cycles). The obtained nanoparticles (NPs) were studied by X-Ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-Ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy techniques. The TEM images of the obtained HNPs showed that the surface of cobalt ferrite was covered with gold nanoclusters, the size of which slightly increased with an increase in the number of gold deposition cycles (from 2.12 ± 0.15 nm after 1 cycle to 2.46 ± 0.13 nm after 10 cycles). The density of the Au clusters on the cobalt ferrite surface insignificantly decreased during repeated stages of gold deposition: 21.4 ± 2.7 Au NPs/CoFe2O4 NP after 1 cycle, 19.0 ± 1.2 after 6 cycles and 18.0 ± 1.4 after 10 cycles. The magnetic measurements showed that the obtained HNPs possessed typical ferrimagnetic behavior, which corresponds to that of CoFe2O4 nanoparticles. The toxicity evaluation of the synthesized HNPs on Chlorella vulgaris indicated that they can be applied to biomedical applications such as magnetic hyperthermia, photothermal therapy, drug delivery, bioimaging and biosensing.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

Сайкова

Pavlikov

Трофимова

et al. 2021

Metals

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“…This resin is an analogue of Purolite A400/A300, Lewatit M-500, Amberlite IRA 402/420, Dowex SBR-P/Maraton A, has a significantly lower cost and is widely used in different separation, purification, and decontamination processes in Russia. Preliminary tests ,, of AV-17-8 showed trends similar to A400/A300 resin. The conversion of resin to the hydroxyl or carbonate form and the determination of its total exchange capacity, that is, the total number of sites available for exchange, were carried out according to the techniques described in our works. , The total exchange capacity of the anion exchange resin in the hydroxide form was 1.0 meq·g –1 and that in the carbonate form was 0.7 meq·ml –1 .…”

Section: Materials and Methodsmentioning

confidence: 80%

Effect of the Deposition Conditions on the Anion Resin Exchange Precipitation of Indium(III) Hydroxide

et al. 2020

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A new patented method for the synthesis of nanosized powders of indium(III) hydroxide and oxide using the strong base anion exchange resin AV-17-8 as a precipitate agent was proposed. The effect of anions of the initial indium salt and the influence of the process duration, temperature, and counterions of resin such as hydroxide or carbonate on the yield of indium(III) hydroxide during the anion resin exchange precipitation were investigated by scanning electron microscopy, electrical conductivity measurement method, and atomic absorption analysis. Based on the obtained data, the mechanism of the anion resin exchange precipitation of indium(III) hydroxide was suggested. The products were characterized by X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry, elemental analysis, Brunauer−Emmett−Teller, and transmission electron microscopy. It was found that impurity-free monophasic In 2 O 3 powders with an average particle size of 10−15 nm and specific surface area of 62−73 m 2 /g were formed after heat treatment of as-prepared products at 400 °C.

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“…The precipitation of metal hydroxides occurs at the resin-solution interface, namely on the resin beads. When the thickness of the surface deposit reaches 1-1.5 μm, it is exfoliated, and an individual product phase forms [35,36]. We used a polysaccharide, dextran-40, to obtain homogeneous nanoparticles with similar sizes and morphologies.…”

Section: Resultsmentioning

confidence: 99%

“…This process is conducted under easily controllable stationary conditions and allows obtaining homogeneous nanoparticles with uniform size and morphology without impurity ions. This method eliminates the use of expensive equipment and multiple washing steps [35,36]. The anion-exchange resin precipitation is conducted in the solution containing dextran-40 to prevent the aggregation of the as-obtained magnetic nanoparticles and control the particle size.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

Сайкова¹,

Pavlikov²,

Трофимова³

et al. 2021

Preprint

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During the past few decades, hybrid nanoparticles (HNPs) based on a magnetic material and gold have attracted interest for applications in catalysis, diagnostics and nanomedicine. In this paper, magnetic CoFe2O4/Au HNPs with an average particle size of 10–20 nm decorated with 2-nm gold clusters were prepared using methionine as a reducer and an anchor between CoFe2O4 and gold. The obtained nanoparticles were studied by X-Ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectroscopy and X-Ray photoelectron spectroscopy (XPS) and UV-Vis spectroscopy techniques. The TEM images of the HNPs obtained after one, six and ten gold deposition cycles showed that the surface of cobalt ferrite was covered with gold nanoclusters, which slightly increased with an increase in the number of gold deposition cycles (from 2.12 ± 0.15 nm after one cycle to 2.46 ± 0.13 nm after ten cycles) without any change in surface density. The magnetic measurements showed that the obtained HNPs possessed typical ferrimagnetic behaviour, which corresponds to that of CoFe2O4 nanoparticles. The toxicity evaluation of the synthesised HNPs on Chlorella vulgaris indicated that they can be applied to biomedical applications such as magnetic hyperthermia, photothermal therapy, drug delivery, bioimaging and biosensing.

show abstract

Production of Gadolinium Iron Garnet by Anion Resin Exchange Precipitation

Cited by 9 publications

References 17 publications

Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

Effect of the Deposition Conditions on the Anion Resin Exchange Precipitation of Indium(III) Hydroxide

Hybrid Nanoparticles Based on Cobalt Ferrite and Gold: Preparation and Characterization

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