Materials Literature
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A micromechanical constitutive model for responding the macroscopic behavior of porous shape memory alloys (SMA) has been proposed in this work. According to the micromechanical method, the stiffness tensor of the porous SMA is obtained. The critical stresses are calculated by elastic mechanics. Based on the general c…
This paper studies the influence of adsorption of methanol and iodine molecules on the conductivity of para-tetradecyloxybenzyliden-amino-2-methylbutyl-cyanocinnamate that was obtained using the Langmuir-Blodgett method. The growth of conductivity of the studied films at methanol absorption and the reduction of conduc…
Silica particle-filled epoxy resin is widely used in electronic packaging. In this research, the isocyanate-terminated polydimethylsiloxane (ITPDMS) was synthesized by terminal-hydroxyl polydimethylsiloxane (HTPDMS) and 2, 4-toluene diisocyanate (TDI) firstly. Then the ITPDMS was used for the surface graft modificatio…
Silicates containing binary combinations of Cs cations with Mg, Sr, Cu, or Fe cations or a ternary combination of Cs, Cu, and Fe cations were prepared by the sol-gel procedure followed by heat treatment of the dried gels. Silicates of the composition Cs 2 MgSi 5 O 12 , Cs 2 SrSi 5 O 12 , Cs 2 CuSi 5 O 12 , CsFeSi 2 O…
The influence of the density of the material of nanoparticles dispersed in a low-density polyethylene (LDPE) matrix on the longitudinal elastic moduli and viscosity coefficients of the obtained nanocomposites has been experimentally studied. It is established that, as the density of the nanoparticle material increases…
Abstract Gold nanoparticles (NPs) and nanorods (NRs) were synthesized by chemical reduction in the aqueous micellar solution of ionic surfactants. Their surfaces were subsequently modified by cysteine. In the cationic cetyltrimethylammonium bromide (CTAB) solution, the linear cross‐assembly of gold NRs with NPs in alt…
Semiconductor nanostructures are promising candidates for efficient thermoelectric energy conversion, with applications in solid-state refrigeration and power generation. The design of efficient semiconductor thermocouples requires a thorough understanding of both charge and heat transport; therefore, thermoelectricit…
Single-phase rhombohedral perovskites (Bi0.9Sr0.1)FeO3 were studied by Mössbauer spectroscopy at temperatures of 293, 87, and 680 K. The Neel temperature T N = 652 ± 2 K of the magnetic transition was measured. Three states of trivalent iron ions in the octahedral states were discovered. Substitution of Sr2+ for 0.1 m…
Syntheses of superconducting iron chalcogenides FeSe 1-x (x = 0-0.15) and FeTe 1-y Se y (y = 0.3-0.55) were performed. Superconducting phase of iron selenide was obtained by the solid-state reaction and from liquid phase. The highest values of critical temperature (T c = 8.2-8.7 K) exhibit FeSe 1-x obtained by the cry…
Fe nanowire arrays were fabricated at lower voltage by alternating current (AC) electrodeposition into the highly ordered nanoholes of the porous alumina membrane (PAM) obtained by two-step anodization in oxalic acid. The morphology, structure and magnetic properties of Fe nanowire arrays were characterized by scannin…
High-quality fine-grained ceramic samples of classical multiferroics PbFe 1/2 Nb 1/2 O 3 (PFN) were synthesized. Their dielectric, magnetoelectric, and magnetic characteristics, including the Mössbauer effect, were measured over wide ranges of temperatures (10–1000 K) and field frequencies (from 25 Hz to 1 MHz). The t…
The phase composition and the kinetics of formation of the lead sulfide crystalline phase at the late stages of heat treatments of sodium zinc silicate glasses have been investigated using small-angle X-ray scattering and X-ray powder diffraction. It has been established that, after the completion of the precipitation…
Ge nanocrystals (Ge NCs) were grown in a multilayered superlattice structure using magnetron co-sputtering technology. Studies were taken to optimize the processing conditions including post-annealing temperature and duration. Structural properties of Ge NCs and multi-bilayers, such as crystallization process, precipi…
Abstract We have dramatically induced the photoluminescence intensity of CdSe quantum dots emitted from plasma antennas, an intuitive picture consisted of a dense shell of CdSe nanocrystals spontenously deposited onto Au metallic grating nanowires which result from the connection of Au nanocrystals through hydrogen bo…
Surface modification of fibers fabricated from ultra-high-molecular-weight polyethylene by pulsed ion-beam treatment was studied. The structure and morphology of the surface layer were examined by the IR MFTIR method and X-ray diffraction analysis. A post-irradiation grafting of a number of acrylic monomers to the fib…
The formation rate of polymorph III during the II → III phase transition in single crystals of the KNO3-RbNO3 solid solutions containing 2.5, 5, and 10 wt % RbNO3 has been measured as a function of temperature using optical microscopy. The formation rate is shown to increase with increasing ΔT (ΔT = T tr − T 0, where…
We report on the enhancement of photoluminescence (PL) from polymer thin films by nanotexturing their surfaces using nanoporous anodic alumina oxide templates. Chromophore-embedded polystyrene films with nanostructured surfaces are prepared by imprinting 200 nm diameter nanopillars with various heights, and their PL o…
We have studied the specific surface area, shape, and size of fine particles of isotropic and needle cokes and isotropic graphite. The results demonstrate that, as the average particle size is reduced from 1000 to 1.5 μm, the BET specific surface area of the powders increases from 0.1 to 100 m 2 /g, exceeding the geom…
The dynamic damage during cavitation erosion is of a spall nature and results from the interference of rarefaction waves. Spherical shock waves, which arise due to the collapse of cavitation bubbles, generate shock waves in the target. The rarefaction waves appear when the velocity of the contact boundary decreases be…
The aim of the present paper is the theoretical investigation of the mechanical properties of carbon nanostructures of graphene and single-wall carbon nanotubes by using nanoscopic and macroscopic approaches. The nanoobject structures in free and deformed states were considered and the corresponding energies were comp…