Materials Literature
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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…
Hepatoprotective activity of 70% ethanolic extract of flowers of C. procera was studied against CCl4 induced hepatic injury in albino rats and mice. In addition, antioxidant activity was studied by in vitro models. Pre-treatment with 70% ethanolic extract (CPA) reduced the biochemical markers of hepatic injury like se…
Abstract The peculiarities of segmental dynamics over the temperature range of −140 to 180 °C were studied in polyurethane‐poly(2‐hydroxyethyl methacrylate) semi‐interpenetrating polymer networks (PU‐PHEMA semi‐IPNs) with two‐phase, nanoheterogeneous structure. The networks were synthesized by the sequential method wh…
Emission properties of Al2O3 nanopowders, synthesized by flame spray pyrolysis with Mg, Cr, and Sc dopants, are investigated, principally in the protein lysing range of 250–290nm (UV-C band). As expected, point defect densities depend on crystal phase and irradiation history and strongly influence emission properties…
The preparation and spectroscopic properties of a series of metallocorroles with polar head groups CHO and CH = C ( CN )( COOH ) are reported, as well as the X-ray crystal structure of 5,10,15-tris(pentafluorophenyl)corrolatoaluminium(III)bispyridine (triclinic space group (P-1) with unit cell parameters: a = 9.426(1)…
The copolymers of triethoxyvinylsilane (TEVS) with styrene (St), butyl acrylate (BA), and methacrylic acid (MAA) were prepared by emulsion polymerization. The copolymerization was carried out by using auxiliary agents at 90 °C in the presence of potassium peroxodisulfate (KPS) as the initiator. Nonylphenol ethylene ox…
Four carbon black grades (namely N234, N375, N660, and N991) having surface area of 120, 90, 36, and 8 m2/g have been studied together with a micronized synthetic graphite and a rubber crumb in their reaction with ozone. The study was conducted at room temperature in heterogeneous and static conditions inside an infra…
Abstract This work studies the flow behavior of a developing two‐phase gas‐polymer suspension during injection into the instrumented mold cavity of an injection molding machine. In the experiments, blowing agent type and concentration were varied along with processing conditions, to generate controlled cell structures…