Materials Literature
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CdSe/ZnS core–shell quantum dots (QDs) have been immobilized by ultraviolet matrix-assisted pulsed laser evaporation (UV-MAPLE) onto SiO 2 glass substrates covered by silica thin films. The silica thin films were deposited by the sol–gel method. An UV KrF* (λ = 248 nm, τ fwhm ≅ 25 ns) excimer laser source was used for…
Epitaxial CoFe2O4 (CFO) films with different thicknesses (6–240 nm) were fabricated on (001) SrTiO3 substrates by reactive cosputtering. Microstructure analyses indicate that the surfaces of the CFO films are covered by islands with height from 2.7 to 0.8 nm upon decreasing film thickness from 240 to 6 nm. Magnetic me…
A new electrostatic focusing Spindt-type field emitter array (FEA) was simulated and fabricated to develop a compact FEA image sensor with a high-gain avalanche rushing amorphous photoconductor target. Although the conventional double-gated FEAs can generate focused electron beams by applying a lower voltage to the fo…
Elastomeric polyurethane (PU) was mixed with 1, 3, 5, 7, and 10 wt% of Cloisite 20A to obtain PU-based nanocomposites. The thermal stabilities of the obtained products were characterized by thermal analysis using a thermogravimetric analyzer (TGA), which showed that addition of 5 wt% of organoclay to the PU increased…
The constants of the central and noncentral interactions between carbon atoms in 2D supracrystals, i.e., generalized two-dimensional crystals in which the sites of the lattice contain, instead of individual atoms, their symmetric complexes, have been calculated. It has been shown that these constants essentially depen…
Beryllium oxide (BeO) nanopowder was synthesized using sol-gel method and the effects of changes of chemical reagents were investigated. Because of tissue equivalence and other outstanding thermoluminescence (TL) properties of the bulk material in X and γ dosimetry, the applicability of this nanostructure in TL dosime…
We study cubic ferroelectrics films that become uniaxial with a polar axis perpendicular to the film because of a misfit strain due to the substrate. The main present result is the analytical account for the elastic anisotropy as well as the anisotropy of the electrostriction. They define, in particular, the orientati…
We employ an analogy to traditional dynamic light scattering to describe the inhomogeneous and anisotropic diffusion of colloid particles near a solid boundary measured via evanescent wave dynamic light scattering. Following this approach, we generate new expressions for the short-time self- and collective diffusiviti…
We propose a random matrix approach to describe vibrations in disordered systems. The dynamical matrix M is taken in the form M = AA T , where A is a real random matrix. It guaranties that M is a positive definite matrix. This is necessary for mechanical stability of the system. We built matrix A on a simple cubic lat…
Effects of heat treatments and applied loads on the tribological behavior of Ti-56.5 wt. % Ni and Ti-57.5 wt. % Ni alloys were investigated. Wear tests were performed on a pin-on-disk tribometer under normal loads of 20 N and 60 N at a sliding speed of 0.3 m/s. The results indicated that the alloys aged at 700 °C show…
Novolac resins of varied ortho to para (O/P) ratios were prepared and characterized with FTIR and 13C-NMR. The nonisothermal curing reactions of these novolac resins with hexamethylenetetramine (HMTA) were studied in detail using a dynamic differential scanning calorimetry (DSC) technique at a series of heating rates.…
Two inorganic pigments (TiO2 and SiO2) were used to prepare composites with polyaniline (PANI) by situ polymerization method. PANI and PANI composites with SiO2and TiO2 were characterized using Fourier transform infrared spectroscopy and X-ray diffraction. The morphology of the synthesized pigments (PANI, PANI-SiO2 an…
We study theoretically the population inversion in intrinsic graphene under optical pulse excitation at room temperature. We develop the theoretical model of carrier relaxation dynamics based on the rate equations derived from the quasi-classical Boltzmann equation. We take into account the energy relaxation and recom…
It has been speculated that lead leaching is related to dezincification, which is characterized by the preferential leaching of zinc from the alloy, leaving behind a porous residue of copper and corrosion products. This increasingly porous layer allows lead to detach and diffuse more rapidly from the brass surface int…
Relaxor characteristics of (1-x)BaTiO 3 -xBi(Mg 1/2 Ti 1/2 )O 3 (x=0.1–0.7) ceramics were investigated. Microstructural observation showed second phases and no domain structure for the sample with x=0.6. Deviation from the Curie-Weiss behavior was found in temperature dependence of the inverse permittivity for all the…
A series of 11 low melting ionic liquids based on meso-substituted A 3 B -porphyrins and A 2 B 2 -porphyrins containing one or two pyridyl substituents have been synthesized in high yields. Three of them are liquids at room temperature. All these porphyrinic salts were characterized by 1 H NMR, 19 F NMR, MALDI-TOF mas…
Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.
We report on nitrogen (N) and copper (Cu) doping in MgxZn1−xO films grown via remote-plasma-enhanced metalorganic chemical vapor deposition and their impact on p-type conduction. The MgxZn1−xO films showed a transformation of conductivity from n-type to p-type with increasing Mg content (x), which occurred at x = 0.07…
We demonstrate that by decoupling the interlayer interactions, N-layer hexagonal graphene is decomposed into the N independent subsystems. Each subsystem, exactly described by a 2 × 2 matrix, is treated as a renormalized graphene with the renormalized site energy and intralayer interaction. The analytical form of the…
Abstract Catalytic activities for direct NO decomposition were investigated on C-type cubic Y2O3–ZrO2 and Y2O3–ZrO2–BaO prepared by coprecipitation. Introduction of excess oxide anions in the Y2O3 lattice was achieved by partial substitution of the Y3+ sites with Zr4+, and high NO decomposition activity was obtained f…