Simulation of the structural state of amorphous phases in nanoscale SiO2 synthesized via different methods

The structural state in nanoscaled SiO₂ is probed experimentally via X-ray diffraction and the simulation method. The aerosil nanoparticles and nanoparticles synthesized via the electron beam evaporation are compared. The nanoparticles for all samples are shown to be in the amorphous state. The amorphous state of a SiO₂ unit lattice is simulated via the molecular dynamics. The full-profile refinement of parameters for a simulated SiO₂ phase (the Rietveld method) has allowed the complete structural information to be established at varying the specific surface. The unit cell parameters, the spatial atomic distribution and the degree of cell node occupation are determined, as well. The specific surface area is shown to decrease in aerosil nanoparticles and to increase in tarkosil nanoparticles with the increasing binding energy of atoms in a cell.

     

Determination of thermal conductivity of silica dioxide Tarkosil T-50 nanopowder by laser flash technique

Results of measuring the thermal conductivity coefficient of silica dioxide Tarkosil T-50 nanopowder by a laser flash technique are reported. Experimental data on thermal conductivity of nanopowder in vacuum, in different gas media, and at different temperatures were obtained. Comparative analysis of thermal conductivity was performed for the T-50 nanopowder and materials with close density values. Based on the experimental data, we obtained a mathematical model to determine the thermal conductivity coefficient of T-50 nanopowder in different gas media.     

Modeling of Structural State of Amorphous Phases of Nanosized SiO2

Russian Physics Journal - The structural state of SiO2 nanoparticles synthesized by plasma-chemical and liquid-phase methods is studied by X-ray diffraction analysis and simulation modeling. The...     

Experimental study of the transition to turbulence at a single stationary disturbance in the boundary layer of an oblique aerofoil

Novosibirsk. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 1, pp. 72–84, January–February, 1995.     

Experimental investigation of high-frequency secondary disturbances in a swept-wing boundary layer

Institute of Theoretical and Applied Mechanics, Novosibirsk 630090. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 36, No. 3, pp. 74–83, May–June, 1995.