Investigations of nanocomposite magnetic materials based on the oxides of iron, nickel, cobalt and silicon dioxide

Gracheva, I. E.; Olchowik, Grażyna; Гареев, К. Г.; Мошников, В. А.; Кузнецов, В. В.; Olchowik, J. M.

doi:10.1016/j.jpcs.2012.12.021

Cited by 15 publications

(10 citation statements)

References 13 publications

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“…3b, the average size found from treatment of AFMimage of the latter sample is <D> ≈ 100 nm. The dis- crepancy can be explained by the presence of indistinguishable by AFM micropores on the surface of silica particles, which increases specific surface area, in accordance with the results of [34]. If the pore sizes are 5…10 nm it is possible to assume its role as a limiting factor for the growth of magnetite crystallites.…”

Section: Resultssupporting

confidence: 80%

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Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles

Харитонский¹,

Гареев²,

Ionin³

et al. 2015

Journal of Magnetics

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Colloidal particles consisted of individual nanosized magnetite grains on the surface of the silica cores were obtained by two-stage sol-gel technique. Size distribution and microstructure of the particles were analyzed using atomic force microscopy, X-ray diffraction and Nitrogen thermal desorption. Magnetic properties of the particles were studied by the method of the longitudinal nonlinear response. It has been shown that nanoparticles of magnetite have a size corresponding to a superparamagnetic state but exhibit hysteresis properties. The phenomenon was explained using the magnetostatic interaction model based on the hypothesis of iron oxide particles cluster aggregation on the silica surface.

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Section: Resultssupporting

confidence: 80%

“…Determination of crystalline phases was carried out using a desktop X-ray diffractometer "Farad" ("Expertcentre"), equipped with chrome cathode, λ Cr-Kα2 = 0.2291 nm. The size of the crystallites was estimated by the equation of Debye-Scherrer as in [34]…”

Section: Experimental Methodsmentioning

confidence: 99%

Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles

Харитонский¹,

Гареев²,

Ionin³

et al. 2015

Journal of Magnetics

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“…First, silica nanoparticles were prepared by sol-gel technique in alcohol solution of tetraethoxysilane (TEOS) [13][14][15][16]. The surface morphology of SiO 2 powders was analyzed by nitrogen thermal desorption.…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of constant magnetic field on aggregation processes in magnetite colloids

Гареев

Kononova

Levitckii

et al. 2014

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Related contentSol-gel synthesis of Pb-free thin-film nanomaterials for electrocaloric devices E V Abrashova, I E Kononova, V A Moshnikov et al. Abstract. Colloids of Fe 3 O 4 /SiO 2 nanoparticles derived by a two-stage technique on the base of tetraetoxisilane soles were studied. Phase composition of the particles was analyzed by X-ray diffraction and Raman spectroscopy. It was found that phase transition of Fe 3 O 4 into α-Fe 2 O 3 occurs at a laser power exceeding a threshold value. The aggregation of the particles to linear structures in a constant magnetic field was studied by atomic force microscopy. The data on the change in resistance of Fe 3 O 4 /SiO 2 colloids under an applied magnetic field were obtained.

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“…Recently, magnetic nanoparticles have attracted significant interest in a wide range of applications, such as cell separation, enzyme immobilization, and targeted drug administration [8,9,10]. Magnetic nanoparticles commonly contain elements such as iron, nickel, cobalt, and their alloys or oxides of magnetic elements [11,12,13,14]. The preparation of magnetic nanoparticles mainly involves chemical methods, including pyrolysis, co-precipitation, sol-gel, micro emulsion, ultrasonic chemistry, electrochemical deposition, and laser decomposition [15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Lysozyme Aptamer-Functionalized Magnetic Nanoparticles for the Purification of Lysozyme from Chicken Egg White

Luo

Zhou

Chen

et al. 2019

Foods

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Lysozyme is in high demand due to its many favorable characteristics such as being naturally occurring, non-toxic, and easy to digest and absorb. Recently, superparamagnetic nanoparticles with strong magnetic responsiveness have attracted significant interest for enzyme purification. The aptamer of the enzyme can be chemically synthesized rapidly at a large scale using simple and low-cost preparation methods. Therefore, Fe3O4 nanoparticles (Fe3O4 NPs) were prepared by chemical co-precipitation and were then functionalized with amino groups to produce NH2-Fe3O4 NPs. The specific reaction of aldehyde and amino groups was used to attach lysozyme aptamers with specific sequences to NH2-Fe3O4 NPs to produce Apt-NH2-Fe3O4 NPs. The synthesized materials were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), hysteresis loop analysis, and thermogravimetric analysis (TGA). The optimal experimental conditions for adsorption of lysozyme were investigated. The effects of initial lysozyme concentration, adsorption time, pH, reaction temperature, and ionic strength were determined. The maximum adsorption capacity and relevant activity of Apt-NH2-Fe3O4 NPs was 460 mg·g−1 and 16,412 ± 55 U·mg−1 in an aqueous lysozyme solution. In addition, as demonstrated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) electrophoresis analysis, lysozyme could be separated from crude fresh egg white using Apt-NH2-Fe3O4 NPs with an amount up to 113 ± 4.2 mg·g−1 and an activity up to 16,370 46 U·mg−1.

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Investigations of nanocomposite magnetic materials based on the oxides of iron, nickel, cobalt and silicon dioxide

Cited by 15 publications

References 13 publications

Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles

Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles

Influence of constant magnetic field on aggregation processes in magnetite colloids

Lysozyme Aptamer-Functionalized Magnetic Nanoparticles for the Purification of Lysozyme from Chicken Egg White

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Investigations of nanocomposite magnetic materials based on the oxides of iron, nickel, cobalt and silicon dioxide

Cited by 15 publications

References 13 publications

Microstructure and Magnetic State of Fe3O4-SiO2Colloidal Particles

Microstructure and Magnetic State of Fe3O4-SiO2Colloidal Particles

Influence of constant magnetic field on aggregation processes in magnetite colloids

Lysozyme Aptamer-Functionalized Magnetic Nanoparticles for the Purification of Lysozyme from Chicken Egg White

Contact Info

Product

Resources

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Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles

Microstructure and Magnetic State of Fe₃O₄-SiO₂Colloidal Particles