T. I. Borodina

Investigation of the characteristics of a colloidal solution and its solid phase obtained through ablation of zinc in water by high-power radiation from a copper vapor laser

Experimental data are presented on the study of a colloidal solution created through zinc ablation in water by means of high-power radiation from a copper vapor laser. Absorption spectrum analysis is performed in the optical range of λ = 200–600 nm. The structural composition and morphology of the solid phase isolated from the colloid are determined by means of X-ray diffractometry, and atomic-force and scanning electron microscopy. It is demonstrated that ZnO, as well as zinc, nanoparticles, which oxidize to ZnO under colloid ageing, are present in the colloid composition after target irradiation. The ZnO end product has a complex structure, which is based on hexagonal crystals 40 × 80 nm in size on average.

Shock‐induced transformations of carbyne

The influence of the shock wave loading on films of amorphous carbyne was explored. Chemically synthesized films were deposited on copper disks of 1 mm thickness. X‐ray and transmission electron microscopy examination of 10 and 150 μm carbyne films recovered after shock loading at pressures of 18, 26, and 36 GPa were carried out. It was detected that 10 μm films partially transformed to carbyne crystals with a size of about 1 μm. Thick films of carbyne transformed to a mixture of an amorphous carbon phase and nanocrystalline cubic diamond.

Formation of hollow micro- and nanostructures of zirconia by laser ablation of metal in liquid

Nanosized zirconia particles were generated by the laser ablation of metal in water and aqueous solutions of sodium dodecyl sulfate (SDS); the structure and morphology of the material were studied by X-ray diffractometry, Raman scattering spectroscopy, and scanning electron microscopy. The cubic, tetragonal, and monoclinic phases of zirconia and an organic-inorganic nanocomposite of Zr-SDS are found in the ablation product upon exposure of zirconium to powerful nanosecond laser pulses with a high repetition rate. Morphologically, the synthesized dioxide is present mainly in the amorphous state. Depending on the experimental conditions, the crystallized part of the dioxide consists of aggregates of rounded dense particles and hollow formations, whole or partially collapsed, close to spherical in shape. It is assumed that vapor-gas bubbles generated during ablation serve as templates for hollow micro- and nanoscale structures.

A ceramic based on partially stabilized zirconia: Synthesis, structure, and properties under dynamic load

A ceramic based on zirconia partially stabilized by yttrium oxide has been prepared. The main properties of the prepared ceramic have been characterized: density, ultimate strength under twisting, microhardness, elasticity coefficients, etc. The microstructure and phase composition of the ceramic and its phase transformations under mechanical action have been studied. The properties of the ceramics under dynamic load have been studied, and the values of the dynamic elastic limit and splitting strength have been obtained. The results have been compared with the literature data.

Behavior of zirconium-dioxide ceramic under the operating conditions of an external trap

The results of an experimental investigation of the penetration and interaction of a melt of iron oxides, which are one of the components with significant mass and corrosive power, with zirconium dioxide ceramic with about 20% porosity are reported. It is concluded on the basis of the data obtained that such a ceramic has functional possibilities for use in the external trap of a nuclear power plant. 2 figures, 8 references.

The features of the synthesis of ZnO nanostructures by laser ablation of zinc in water-surfactant solutions

The data of experimental investigation of optical properties of colloidal solution, its composition and morphology of the dispersed phase, resulting from laser ablation of zinc in aqueous solutions of surfactants—sodium dodecyl sulfate (SDS) and dioctil sodium sulfosuccinate (AOT) are presented. It is shown that an optical absorption spectra of the colloids, X-ray spectra and AFM (atomic force microscopy) images solid phase of colloids can trace the dynamics of synthesis ZnO nanostructures from zinc nanoclusters in the size of nanometers to fractal aggregates (FA) up to hundreds of nanometers. Determinants of this process are the average power and duration of irradiation, the frequency of the laser pulses, the colloid aging time, the type and concentration of surfactant in the solution. At the selecting of appropriate regimes of the process, along with zinc oxide other nanoproducts-hydrozincite and organic-inorganic layered composite [(β)-Zn(OH)2 + SDS] are obtained.

Shock-Wave Loading of Amorphous Carbon Nitride in Recovery Ampoules

A small amount of crystalline carbon nitride x-C–N is synthesized under conditions of stepwise shock-wave compression to a pressure of ∼14 GPa of amorphous carbon nitride obtained by pyrolysis of mercuric thiocyanate Hg(SCN)2. The x-C–N structure is characterized by the following set of reflections: 3.429 Å (w), 3.147 Å (s), 2.188 Å (s), 2.078 Å (s), 1.919 Å (w), 1.763 Å (w), and 1.560 Å (w). The samples containing x-C–N have clearly defined abrasive properties.

Phase transitions of partially stabilized zirconia under stepwise shock-wave loading

High-density partially yttria-stabilized zirconia ceramics were manufactured. The primary properties of the manufactured ceramics, such as crack resistance, ultimate bending strength, hardness, elastic moduli, etc., were characterized. The microstructure of the ceramics and the phase transitions under mechanical (including shock-wave) and thermal actions were studied.

Ceramics based on partly stabilized zirconium dioxide: technology, structure, properties, and behavior under dynamic action

Technology is described for manufacturing dense ceramic from very fine powder based on zirconium dioxide partly stabilized with yttrium oxide. Some engineering properties of the manufactured ceramic are defined. Its microstructure and phase composition are studied. Ceramic properties with impact-wave loading are studied, and values of dynamic elastic limit and spalling strength are obtained.

Morphology of Tungsten Nanooxides, Synthesized by Laser Ablation of Metal in Water

Colloidal solution precipitates obtained during laser ablation of tungsten in water and containing nanostructured metal oxides are studied using X-ray diffraction and scanning electron microscopy. The nanostructure composition and morphology are analyzed. It is shown that the material composing nanostructures is X-ray amorphous, i.e., the particle size does not exceed 1–2 nm. The high degree of the structure surface development implies prospects of their use as substrata when analyzing the composition of various materials by surface-enhanced Raman scattering.