Materials Literature
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Experimental data are presented which demonstrate that plasma electrolytic processing of aluminum and titanium in room-temperature aqueous solutions containing tungstate iso-and heteropolyoxoanions is a viable approach to producing Al/Al 2 O 3 /WO 3 and Ti/TiO 2 /WO 3 structures. Tungsten trioxide can be obtained both…
Beryllium is planned as a plasma-facing material for ITER covering most of the inner wall of the plasma vessel. It is thus subjected to intense fluxes of escaping hydrogen ions from the plasma, which are implanted and retained in the plasma-facing material. As beryllium reacts very quickly with oxygen and especially w…
A new boron nitride polymorph is prepared for the first time by supercritical fluid synthesis in a high-pressure gazostat at a pressure P < 200 MPa and a temperature T < 1000°C in various atmospheres. The formation of the new phase is confirmed by x-ray diffraction and infrared absorption spectroscopy. A number of lin…
Manufacturability of most electronic devices based on carbon nanotubes depends on the ability to place, manipulate, and control individual structures at the molecular level. This approach is problematic due to the precise placement and registration required thus making large scale manufacturing difficult if not imposs…
A new structural model is proposed for cubic nitroprussides and the crystal structure for the complex salts of Fe(2+), Co(2+), and Ni(2+) refined in that model. In cubic nitroprussides the building unit, [Fe(CN) 5 NO] 2− , and the assembling metal ( M =Fe 2+ , Co 2+ , Ni 2+ ), have ¾ occupancy with three formula units…
Abstract Skim rubber (SR) was obtained by coagulation of the serum phase separated in the course of preparation of concentrated natural rubber (NR) latex. Saponified skim rubber (SSR) was prepared by soaking of SR with aqueous sodium hydroxide. The effect of non-rubber components on the thermal oxidative degradation o…
Generated aerosol particle deposition has been applied in laboratory scale to induce deactivation of commercial Selective Catalytic Reduction (SCR) catalysts of V2O5-WO3/TiO2 monolithic type. The monolithic catalyst has been exposed to the generated submicrometer particle of inorganic salts, KCl, K2SO4, and ZnCl2 at 2…
Abstract The correlation between surface tension parameters and the chemical composition of poly(amic acid) and polyimide films, before and after plasma treatment, was investigated. Calculations are based on the geometric mean approach according to Owens, Wendt, Rabel, and Kälble, on the Lifshitz‐van der Waals acid/ba…
Physical and mathematical models of mechanochemical synthesis in the macroscopic approximation were suggested. The mathematical model is based on the equations of (a) heat balance in a reactor, (b) dynamics of excess energy in condensed matter (defining the effect of mechanical activation on the rate of chemical react…
Measurements of the angular dependency of luminescence and lasing spectra were carried out for a planar layer of a dye-doped cholesteric liquid crystal (CLC). In addition to the known Bragg emission mode propagating along the cell normal, we observed that leaky modes also depend on the pump intensity and on the dimens…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The fuel economy and reduction of harmful elements in lubricants are becoming important issues in the automotive industry. An approach to respond to these requirements is the potential use of low friction coatings in engine components exposed to boundary lubrication conditions. Diamond-like carbon (DLC) coatings exten…
A thermogravimeter (TGA, Mettler-Toledo TGA/SDTA851e) was connected to an inductively coupled plasma optical emission spectrometer (ICP-OES, Varian Liberty 110) using a condensation interface (CI), which transforms gaseous high-boiling-temperature substances into solid (or liquid) aerosols. Argon was used as the carri…
Lead-free ferroelectric (Na 0.5 K 0.5 )NbO 3 (NKN) thin films were fabricated by a sol–gel process on two types of Pt/Ti/SiO 2 /Si substrate at different deposition temperatures, that is, a room temperature and 300 °C, for Pt/Ti layers. The Pt layer deposited at room temperature had a large variation in 111 d -space,…
Nanosized gold particles immobilized on γ-Al 2 O 3 exhibited catalytic activity in the allylic isomerization reaction of allylbenzene. As the size of gold nanoparticles was decreased from 40 to 2 nm, their specific activity per surface gold atom nonmonotonically increased from 0.5 to 110 (mol products) (mol Au surface…
Cadmium sulfide (CdS) nanoparticle (NP) was synthesized in the apoferritin cavity by slow chemical reaction system (SCRY) and two step synthesis protocol (TSSP). The survey showed thioacetic acid as the optimum sulfur source to form CdS NPs in the apoferirin cavity. Thioacetic acid degrades slowly in weak acidic solut…
In this study, a disk-shaped piezoelectric transformer was fabricated using lead-free (K,Na)NbO(3)-based ceramics with high mechanical quality factor. The transformer can operate in the fundamental or the third radial vibration mode. The transformer is poled along the thickness direction. The top surface is covered by…
Abstract We propose a theoretical explanation of the parallel and perpendicular lamellar orientations in free surface films of symmetric polystyrene‐ block ‐polybutadiene diblock copolymers on silicon substrates (with a native SiO x layer). Two approaches are developed: A correction to the strong segregation theory an…
PURPOSE: Commercially pure titanium alloys are currently used as metallic biomaterials in implantology. Corrosion phenomena appear to play a decisive role in metallic implant long-term behavior. Thus, the goal of this study was to examine the genotoxic potential of corrosion eluates obtained from dental implants using…
We report on the properties of 10 nm thick Co50Fe50 interdigitated electrodes deposited on lead zirconate titanate (PZT) substrates to achieve low power dynamic tuning of magnetic properties. The actuation of this combination relies on magnetoelectric coupling through the shear mode deformation of the PZT: numerical s…