A5038311215- Supercapacitor Materials and Fabrication
- nanoparticles nucleation surface interactions
- Material Properties and Applications
- Advanced Materials Characterization Techniques
- Magnetic properties of thin films
- Catalytic Processes in Materials Science
- Laser-Ablation Synthesis of Nanoparticles
- Conducting polymers and applications
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Electron and X-Ray Spectroscopy Techniques
- Nanomaterials for catalytic reactions
- Catalysis and Hydrodesulfurization Studies
- Thermal and Kinetic Analysis
- Electrochemical sensors and biosensors
- Chemical Synthesis and Characterization
- Metallurgical and Alloy Processes
- Advancements in Battery Materials
- Energetic Materials and Combustion
- Electrocatalysts for Energy Conversion
- Chemical and Physical Properties of Materials
- Mesoporous Materials and Catalysis
- Aerogels and thermal insulation
- Solid-state spectroscopy and crystallography
- Chemical Thermodynamics and Molecular Structure
- Metallic Glasses and Amorphous Alloys
Kemerovo State University
2015-2024
Siberian Branch of the Russian Academy of Sciences
2021-2024
Federal Research Centre Coal and Coal Chemistry
2019-2024
Institute of Coal of the Siberian Branch of the RAS
2021-2023
Russian Academy of Sciences
2014-2022
Nanostructured Fe–Co–Ni powders, with crystallite sizes of 10–35 nm for different compositions, are obtained in the whole range compositions (step change components content is 10 wt.% and, case near phase boundaries, 3–5 wt.%) by reduction freshly co‐precipitated mixed hydroxides hydrazine hydrate a strongly alkaline medium. The isothermal section diagram corresponding to synthesis temperature (363–368 K) constructed using reflection modeling based on XRD data samples series compositions....
In the paper, particle morphology is considered and slices of phase diagrams nanosystems agreeable to synthesis conditions are constructed according data obtained earlier by authors, as well new results study nanostructured Fe-Co, Fe-Ni, Co-Ni, Fe-Co-Ni, Fe-Pt, Cu-Ni Ni-Cd powders. It found that all polymetallic systems have common nature size spatial organization, i.e., 7-20 nm nanocrystals (for different systems) form highly compact aggregates (40-100 nm) which put together into loose...
The review of the results obtained by authors in field synthesis Fe-Co, Fe-Ni, Co-Ni and Cu-Ni nano-size binary systems (NBS) liquid-phase reducing metal chlorides hydrazine (pH>10) sodium tetrahydroborate (NaBH4) (pH = 7-8) process conditions variation (temperature reaction medium, concentration input order reagents) as well NBS properties investigation is presented.
Au/C nanocomposites have been obtained by the ultrasonic assisted reduction of HAuCl4 solutions, impregnated in carbon material pores, using NaBH4 as a reducing agent. It was established that conditions nanocomposite (NC) synthesis exert an essential influence on shape and size characteristics Au filler functional properties NCs. Characterization NCs X-ray diffraction, small-angle scattering, cyclic voltammetry methods has revealed increase concentration raises not only gold nanoparticle...
Abstract In this work, on the example of bimetallic systems FePt and FePd, an approach is developed to assessing structural parameters nanoscale mono-and polymetallic by transmission electron microscopy (TEM), in comparison with X-ray diffraction method analysis. The interplanar distances, average sizes phase compositions FePd nanosystems are calculated.
This paper reveals and describes the features of NicoreAushell nanoparticles' magnetic properties. Their activation energy monodomain thermal relaxation (5.1 × 10–20 J) constant crystalline anisotropy ((2.0–2.1) 104 J/m3) are higher than bulk nickel has. Compared with nanostructured fcc-Ni powders, there is a decrease in coercive force, presence "hard" magnetization, rising magnetization along increasing degree oxidation, characteristics to very low values at 300 K. These related structure...
<p>The influence of heating process (up to 200, 400 and 600 °C) on the phase transformation non-equilibrium biphase Fe-Co-Ni systems was studied. The system not changed at 200 °C, it remained nanostructured, there were no transformations. At higher temperatures BCC- into FCC-phase (high-temperature modification) observed. degree depended composition. 400–600 °C coarsening crystallites. In addition, phenomenon oxidizing attended by iron outflow from phase; as a result, lattice...
Abstract The paper compares some characteristics of nanoparticles the FePt system obtained by method joint reduction solutions metal precursors using different reducing agents: an alkaline solution hydrazine hydrate and sodium tetrahydroborate. transmission electron microscopy is used to analyze shape morphology nanosized particles, according data methods X-ray diffraction, phase analysis carried out main structural parameters are evaluated. Thermal in combination with mass spectrometry...
Abstract Joint reduction with hydrazine from aqueous solutions of precursors produced nanostructured powders the Fe – Pt system in three characteristic phase regions. The samples were subjected to heat treatment range up 800 ° C and characterized at all stages by X-ray diffraction high-resolution electron microscopy; elemental composition was refined method optical emission spectroscopy inductively coupled plasma. In initially obtained samples, only a part substance is detected...
The development of methods ensuring reliable control over explosive chemical reactions is a critical task for the safe and efficient application energetic materials. Triggering explosion by laser radiation one promising methods. In this work, we demonstrate technique applying common industrial high pentaerythritol tetranitrate (PETN) as photosensitive material adding zinc oxide nanopowders doped with copper iron. Nanopowders ZnO:Fe ZnO:Cu able to absorb visible light were synthesized....
Ultrafine nanopowder of mixed iron-cobalt and iron-nickel hydroxides are synthesized by deposition metal salts in aqua-solution mean sodium hydroxide. The used as precursors for preparing nanoscale powders mutual systems (iron-cobalt, iron-cobalt-nickel). It is shown the possibility to synthesize nanostructured solid solutions hydroxides. In addition, phase composition, structural characteristics particle size distribution investigated.
Core-shell Ni/Au nanoparticles are synthesized in a two-stage process aqueous solutions. The core-shell structure of the particles is proven by using results HRTEM, TEM, SAXS and CVA methods. thickness core estimated at 1 nm it formed from 1–2 layers mutually oriented gold crystallites. show that Au-shells nanoporous, layer nickel oxidation products formed. These were obtained Vis spectrophotometer, SAXS, elemental analysis.
In the work by methods of XRD, TEM, SAED, XPS combined with mass-spectrometry gaseous products, SAXS, and elemental analysis samples phase compositions morphology particles nanostructured Co-Pt system synthesized method reduction hydrazine-hydrate aqueous solutions precursors were studied (in region rich in Pt for first time). It was found that composition range up to ≈ 60 at. % Co. XRD-analysis fixes as only FCC solid solution Co Pt, established upper limit solubility %18±1 At content above...
Nanostructured Fе-Pt/С composites based on a carbon matrix with filler content of 1 wt%, and the molar ratio Pt/Fe components equal to 9 : have been obtained by joint reduction aqueous solutions precursors (hydrogen hexachloroplatinate(IV) iron(II) sulphate) an alkaline solution hydrazine hydrate at temperature 90-95 °C. The was mainly microporous sorbent (SAK) synthesized high-temperature activation anthracite from Kuznetsk coal basin. formation Fе-Pt nanophase initial stages synthesis has...