Nanoparticles of Magnetite in Polymer Matrices: Synthesis and Properties

Kydralieva, Kamila; Джардималиева, Г. И.; Yurishcheva, A. A.; Jorobekova, Sharipa

doi:10.1007/s10904-016-0436-1

Cited by 25 publications

(7 citation statements)

References 94 publications

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“…Bare Fe 3 O 4 NPs were prepared by the coprecipitation method described in ref. 6 Then, 13.6 g of APTES was added to the solution under argon or air atmosphere, respectively, at 40 C for 2 h. A molar ratio of 4 : 1 (APTES : Fe 3 O 4 ) was used. In the case of argon atmosphere, all manipulations were carried out in a glove box.…”

Section: Synthesis Of Fe 3 O 4 Npsmentioning

confidence: 99%

“…3,4 Hematite is the most stable of these iron oxides, but only magnetite NPs have a large surface area (up to 120 m 2 g À1 ) 5 and possess superparamagnetic properties, i.e., unlike ferromagnetic materials, they do not retain magnetization when the external eld is removed. 6 These properties are highly useful in the development of various separation processes 7,8 and several Fe 3 O 4 -based materials are already close to commercial use in this area. 9 Iron oxides such as magnetite and maghemite demonstrated superparamagnetic behaviour at a size below 30 nm at room temperature and referred to as superparamagnetic iron oxide nanoparticles (SPIONs).…”

Section: Introductionmentioning

confidence: 99%

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Sample preparation considerations for surface and crystalline properties and ecotoxicity of bare and silica-coated magnetite nanoparticles

et al. 2021

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Section: Synthesis Of Fe 3 O 4 Npsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sample preparation considerations for surface and crystalline properties and ecotoxicity of bare and silica-coated magnetite nanoparticles

et al. 2021

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“…Humic acids (HA) being natural high-molecular compound, have a high affinity to Fe 3 O 4 nanoparticles; the sorption of HA on the Fe 3 O 4 nanoparticles enhances the stability of the nanodispersions by preventing their aggregation [5][6][7][8]. Previously [8,9], magnetite Fe 3 O 4 nanoparticles coated with HA were used for the extraction of heavy metal ions from water. Under certain conditions, these insoluble magnetic materials get an advantage of being easily removed with magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactions

et al. 2020

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Current paper presents biological effects of magnetite nanoparticles (MNPs). “Relations of MNP’ characteristics (zeta-potential and hydrodynamic diameters) with effects on bacteria and their enzymatic reactions were the main focus.”. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.

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“…Moreover, the lack of a stabilizing coating for the magnetic core makes magnetite susceptible to oxidation with oxygen in the air, which as already mentioned is particularly negative for biomedical applications. The cover layer also reduce the risk of adverse effects of material when nanoparticles are used as therapeutic agent [ 67 , 68 ] and allows for the improvement of nanoparticle dispersion in solutions, limiting their toxicity, as well as improving the physicochemical and functional properties. The shell covering the magnetic core can be generated in situ during the preparation of the nanoparticles themselves, or then, the previously obtained pure nanoparticles can be coated.…”

Section: Modification Of Bare Magnetite Nanoparticlesmentioning

confidence: 99%

Polymer-Coated Magnetite Nanoparticles for Protein Immobilization

et al. 2021

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Since their discovery, magnetic nanoparticles (MNPs) have become materials with great potential, especially considering the applications of biomedical sciences. A series of works on the preparation, characterization, and application of MNPs has shown that the biological activity of such materials depends on their size, shape, core, and shell nature. Some of the most commonly used MNPs are those based on a magnetite core. On the other hand, synthetic biopolymers are used as a protective surface coating for these nanoparticles. This review describes the advances in the field of polymer-coated MNPs for protein immobilization over the past decade. General methods of MNP preparation and protein immobilization are presented. The most extensive section of this article discusses the latest work on the use of polymer-coated MNPs for the physical and chemical immobilization of three types of proteins: enzymes, antibodies, and serum proteins. Where possible, the effectiveness of the immobilization and the activity and use of the immobilized protein are reported. Finally, the information available in the peer-reviewed literature and the application perspectives for the MNP-immobilized protein systems are summarized as well.

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Nanoparticles of Magnetite in Polymer Matrices: Synthesis and Properties

Cited by 25 publications

References 94 publications

Sample preparation considerations for surface and crystalline properties and ecotoxicity of bare and silica-coated magnetite nanoparticles

Sample preparation considerations for surface and crystalline properties and ecotoxicity of bare and silica-coated magnetite nanoparticles

Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactions

Polymer-Coated Magnetite Nanoparticles for Protein Immobilization

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