Materials Literature
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Abstract We study the interaction of hydrogen donors and Lithium acceptors in bulk ZnO by electron paramagnetic resonance and photoluminescence. With increasing diffusion temperature the number of hydrogen donors increases whereas the number of deep Li acceptors decreases. In the temperature range between 450 and 600…
A novel plasma atmospheric pressure abnormal glow discharge was used to investigate synthesis gas production from reforming methane and carbon dioxide. Special attentions were paid to the discharge characteristics and CH4, CO2 conversion, H2, CO selectivity, and ratio of H2/CO varied with the changing of discharging p…
[structure: see text] Long chain alkyl-alkyl interactions appears to be the main driving force in hydrogen bond isomerism induced transformation of lamellar architectures to nanotubular constructs in alkylammonium dicarboxylate salts; the syntheses of the nanotubes require no skill for typical organic synthesis, and t…
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 compound R-(+)limonene is available and cheap than its oxidized products. Consequently, the selective oxidation of R(+)limonene has attracted attention as a promising process for the production of compounds with a higher market value, such as cis/trans-1,2-limoneneoxide, cis/trans-carveol and/or carvone. One of th…
The DNA-poly(o-methoxyaniline) (POMA) hybrid is prepared by mixing aqueous solutions of POMA [emeraldine salt (ES), doping level [Cl]/[N] = 0.52] and sodium salt of DNA (Na-DNA) and is then freeze-dried after 4 days. Three different compositions (WDNA = 0.25, 0.5, and 0.75, WDNA is the weight fraction of DNA) of the h…
Single-phase samples of La 1− x Ca x MnO 3 compounds have been synthesized by solid-state reaction. Detailed Rietveld analysis of powder X-ray diffraction data showed that La 1− x Ca x MnO 3 undergoes a structural phase transformation from R -3 c to Pnma at X =0.05–0.075. There is a linear variation of lattice paramet…
We have prepared a series of dimeric compounds, m OAM5AMO m , which comprise two Schiff's base mesogens. These compounds formed three types of fluid smectic liquid crystals. When the alkoxy tail length is short ( m =4 and 6), the alkoxy tail groups mix randomly with the alkyl spacer groups, resulting in the SmCA s pha…
Ordered hexagonal smaller supermicroporous silica (JLU-14L and JLU-11L) has been successfully synthesized at ultralow temperature (0 approximately -20 degrees C) by semifluorinated surfactants, which is extensively investigated by X-ray diffraction, N2 adsorption, and transmission electron microscopy. X-ray diffractio…
Direct growth of individual and vertically aligned carbon nanotubes (CNT) onto a metallic tip apex using a two-chamber radio-frequency plasma-enhanced chemical vapor deposition reactor is reported. Individual Ni nanocatalysts were the sites for the nucleation of individual CNTs that were freestanding, clean, and verti…
Abstract The nature and origin of the clay mineralogy of the Jurassic strata of the British Isles are described and discussed within their lithological and biostratigraphical framework using published and unpublished sources as well as 1800 new clay mineral analyses. Regional clay mineral variation is described system…
Abstract ZnO nanostructures are expected to pave the way for many interesting applications in optoelectronics, spin electronics gas sensor technology and biomedicine. Fabrication methods, especially for nanorods have been based mostly on catalyst‐assisted growth methods that employ metal‐organic sources and other cont…
Silica‐coated lanthanum–strontium manganite particles with La 0.76 Sr 0.24 MnO 3+δ stoichiometric formula, exhibiting Curie temperature at ∼40°C, were prepared by using a traditional solid‐state method of synthesis of magnetic ceramic particles, followed by milling and a low‐temperature coating procedure in an aqueous…
Photoluminescence and positron annihilation spectroscopy have been used to characterize and identify vacancy-type defects produced in ZnO films grown on sapphire by metal-organic chemical-vapor deposition. The photoluminescence of the samples in the near band edge region has been studied, paying particular attention t…
Polycarbonate (PC) was modified with organic-inorganic nanostructured acrylate polymer and its tensile and impact properties were studied. The PC alloys exhibited higher flexibility than pure PC and the tensile strength hardly decreased with the addition of the modifiers. The SEM results indicated that the inorganic p…
Abstract (Zn,Mn)S nanoparticles with Mn concentrations ranging from 1% to 30% and in a wire‐like arrangement were formed inside mesoporous SiO 2 matrices of various pore diameters. The nanoparticles were characterised using photoluminescence and excitation spectroscopy. It is found, that the Mn 2+ ions are incorporate…
Plastic strain macrolocalization at the parabolic stage of strain hardening in Zr-1 wt% Nb alloy is studied. The plastic flow is found to be unstable, which shows up as the oscillatory periodic space-time variation of the local strain distribution. The results are discussed in terms of a synergetic model of plastic fl…
Abstract Using the well established MBE process, we introduced colloidal nanocrystals (NCs) into monocrystalline semiconductor layers. CdSe nanorods (NRs) and CdSe(ZnS) core‐shell nanodots (NDs) with radii R between 2 and 4 nm on a ZnSe surface are capped by thin ( d ∼ 2 R ) and thick ( d > 2 R ) MBE‐grown ZnSe lay…
Abstract We report an experimental study of the conductivity switching effect in mono and polycrystalline layers of Cd 1–x Zn x Te grown by MBE on the Si(001)/Au and n + ‐ GaAs(001) substrates. The current‐voltage (I‐V) characteristics of metal‐semiconductor junctions show that the conductivity of the Cd 1–x Zn x Te s…
We report an assembled microelectromechanical system (MEMS) electrostatic microcolumn design that employs a multiwall carbon nanotube emitter as an electron source. The microcolumn is designed for a beam diameter of 10–20 nm with a beam energy of 1 keV at currents of up to 1 nA and a 100μm field of view. The maximum v…