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Article
Studying an Iron Oxide Nanopowder as a Bioactive Material
A polydisperse iron oxide nanopowder consisting of hematite α-Fe2O3 and magnetite Fe3O4 has been synthesized by solid-state reduction of iron hydroxide Fe(OH)3. The obtained iron oxide nanopowder has been used to...
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Article
Self-Induced Suction of Fluid in a Turbulent Boundary Layer on a Permeable Surface
A turbulent boundary layer of a viscous incompressible fluid develo** past a flat plate at finite distances from the laminar–turbulent transition zone is studied. It is assumed that the characteristic Reynol...
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Article
Enriching Feedstock of Functional Food with Nanosized Selenium
A study is performed of dispersion processes for obtaining selenium colloidal solutions via laser ablation, an ultrasonic bath, an ultrasonic rod vibration system, and mechanical action in order to determine t...
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Article
Effects of Silicon Nanoparticles on Photosynthetic Pigments and Biogenic Elements in Tomato Plants Infected with Root-Knot Nematode Meloidogyne incognita
New data on the effect of colloidal silicon nanoparticles on the content of nutrients and photosynthetic pigments in tomato plants invaded by root-knot nematode Meloidogyne incognita are presented. Foliar treatme...
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Article
Production of Aqueous Colloidal Se Solution by Mechanical Dispersion
Owing to its antioxidant properties, selenium is an essential trace element for human life which enters the body mainly from foods of plant origin. To obtain selenium nanoparticles for the preparation of funct...
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Article
Universality of the Principle of Sufficiency for Ultrasonic Technologies in Liquid Media
Using an ultrasonic technology as an example, we showed the validity and universality of the principle of sufficiency proposed by Dobatkin for various economics fields. A 25-mm-thick compacted material having ...
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Article
Functional Materials for Radioactive Waste Management
Cost-effective, safe, and efficient technology for obtaining powder compositions of polydisperse iron oxides with carbon by reducing nanosized raw material with solid carbon has been developed. The use of the ...
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Article
Synthesis and Characteristics of Selenium Nanoparticles for Enriching Radish Seedlings
Selenium is an essential trace element for humans, animals, and plants, the main function of which is protecting the body from oxidative stress. The use of enriched food products, the seeds of which were treat...
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Article
Applications of nuclear magnetic resonance to study the structure of platinum-group metal complexes in aqueous solutions
The review includes comprehensive NMR data on platinum metals (99,101Ru, 103Rh, 105Pd, 187Os, 195Pt) and ligand donor atoms (1H, 13C, 14,15N, 17O, 19F, 31P) of metal complexes in aqueous solutions. A systematic a...
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Article
Quantitative determination of content of magnetite and maghemite in their mixtures by X-ray diffraction methods
The possibility is studied and the features of the use of Rietveld X-ray diffraction method are revealed for the quantitative determination of maghemite and magnetite in their mixtures. Comparison of the data ...
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Article
Formation of aqueous colloidal solutions of selenium and silicon by laser ablation
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Article
Complexation of the [Rh(H2O)6]3+ ion with phosphoric acid as probed by 31P NMR
The kinetics of the reaction [Rh(H2O)6]3+ + H3PO4 ↔ [Rh(H2O)5H2PO4]2+ + H3O+ has been studied by 31P NMR; E a = 142 ± 12 kJ/mol, logA = 17 ± 2. An empirical dependence of the 31P NMR chemical shif...
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Article
A multinuclear magnetic resonance study of transformations of ruthenium(II) nitrosyl chloride complexes in aqueous solutions
Aqueous solutions of ruthenium nitrosyl chloride complexes have been studied by14N, 15N, 17O, 99Ru, and 35Cl NMR. Individual complex species have been identified and the corresponding chemical shifts have been de...
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Article
103Rh, 17O, and 31P NMR study of Rh(III) complex formation in acidic sulfate-phosphate media
Rhodium(III) complex formation with phosphoric acid in strong acidic solutions has been studied by 103Rh, 17O, and 31P NMR. Phosphoric acid is mainly coordinated to rhodium as a monodentate terminal HPO ...
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Article
Solid-phase condensation of rhodium(III) aqua sulfates
Solid-phase condensation of rhodium(III) aqua sulfates yielding oligomeric rhodium(III) aqua sulfate complexes was revealed. The isothermal dehydration of rhodium(III) aqua sulfates under thermal diffusion con...
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Article
Platinum(IV) complexation with the nitrate ion in aqueous solutions according to 195Pt, 15N, 14N, and 17O NMR data
Solutions of platinum(IV) nitrate were studied by 195Pt, 15N, 14N, and 17O NMR and IR and Raman spectroscopy. It was found that in nitric acid, two interrelated systems of nitrate complexes, mono- and polynuclear...
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Article
A study of the hydrolysis of ZrF 6 2− and the structure of intermediate hydrolysis products by 19F and 91Zr NMR in the 9.4 T field
The high-field 19F and 91Zr NMR method is used to study the hydrolysis and polycondensation of hexafluorozirconate ZrF 6 2− in aqueous and water-peroxide solut...
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Article
Complexes forming from ammonium paramolybdate, orthophosphoric acid, cobalt or nickel nitrate, and carbamide in solution and their use in the preparation of diesel fuel hydrodesulfurization catalysts
It is demonstrated by 14N, 17O, 31P, and 95Mo NMR spectroscopy that the heteropolyanion [P2Mo5O23]6− forms in impregnating solutions containing orthophosphoric acid, ammonium paramolybdate, cobalt or nickel nitra...
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Article
103Rh and 17O NMR study of oligomer rhodium(III) sulfates in aqueous solutions
By virtue of 103Rh-, 17O-NMR, electrophoresis in agarose gel, and pH-metry, we report on the formation of rhodium(III) sulfate complexes in aqueous solutions. At higher concentrations of sulfuric acid (above 3 M)...
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Article
Nitration of rhodium(III) sulfates
Nitration of sulfate complexes of rhodium has been investigated by NMR 103Rh, 14N, 15N, and 17O NMR. At high pH, [Rh(NO2)6]3−, dimer [Rh2(μ-OH)2(NO2)8]4−, and trimer [Rh3(μ-OH)4(OH)(NO2)9]5− are the dominant spec...
