Materials Literature
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High density porous has been fabricated by UV-enhanced electrochemical etching on Si-doped layer grown by metallorganic chemical vapor deposition. A redshift from 0.7 to in the (high) phonon peak of was observed in this porous with respect to as-grown . As the phonon peak of a stress-free is observed at , it means tha…
This work describes the Michael addition of unprotected, branched, (A)x-type acrylate monomers (i.e., trimethylolpropane triacrylate (TMPTA); x = 3 or pentaerythritol tetraacrylate (PTA); x = 4) to various mono- and poly-alkyleneamine cores under mild conditions to produce (core: amine); G = 1; [dendri-poly(ester-acry…
Microstructure and mechanical properties of AZ31 and AZ61 magnesium alloys after rolling and then subjected to equal channel angular pressing (ECAP) were investigated. Tensile tests were carried out at room temperature. The values of microhardness, the ultimate tensile strength and the elongation to failure were deter…
Magnetization curves of single crystals of Nd 2 Fe 14 B and its hydride Nd 2 Fe 14 BH 4 have been measured along their principal crystallographic directions in a temperature range of 4.2–280 K. The magnetic anisotropy constants, which allow one to describe experimental magnetization curves as well as the low-temperatu…
Aluminum-doped Ge(2)Sb(2)Te(5) (Al(x)GST) films were deposited on Si(100) substrates by co-magnetron sputtering system. The Aluminum concentrations in these films are determined by X-ray photoelectron spectroscopy (XPS). The influence of Al doping upon phase change characteristics of these Al(x)GST alloy films has bee…
Ordered inorganic–organic hybrid periodic mesoporous organosilicas (HPMOs) with hexagonal symmetry were synthesized under acidic conditions by using triblock copolymer Pluronic P123 as a structure-directing agent and mixtures of tetraethylorthosilicate (TEOS) and bis(triethoxysilyl)ethane (BTEE) as the silica source.…
Mn(III)AlPO-5 and Cr(VI)AlPO-5 redox (microporous) catalysts are effective, in the presence of dissolved acetylperoxyborate (APB) under mild conditions (333-373 K), and much superior to the titanosilicate, TS-1 (also a single-site heterogeneous catalyst), in the selective oxidation of primary, secondary, benzylic and…
We have investigated the fluctuations of the intensity and the line intermittency in the surface enhanced Raman spectra of a single iron-protoporphyrin IX molecule. A statistical analysis has revealed a high correlation between the intensity of each frequency couple in the spectrum. Removal of the continuum background…
During the last decade severe plastic deformation (SPD) has become a well established method of materials processing used for fabrication of ultrafine‐grained (UFG) materials with advanced properties. Nowadays SPD processing is rapidly developing and is on the verge of a transition from lab‐scale research to commercia…
For the manufacture of carbon fibre reinforced SiC materials, three different processes are used in principle: Chemical Vapour Infiltration (CVI), Liquid Polymer Infiltration (LPI), also called Polymer Infiltration and Pyrolysis (PIP) as well as Melt Infiltration or Liquid Silicon Infiltration (MI / LSI). Depending on…
An iron loss measurement method for ac filter inductors used on PWM inverters is proposed in this paper. A distinctive feature of this method is that the iron loss of the ac filter inductor can be individually measured in each switching period, thereby allowing the loss distribution during one cycle of output frequenc…
Biodegradable aliphatic polyester (APES)/thermoplastic starch (TPS)/Cloisite 30B ternary hybrid nanocomposites were prepared via melt intercalation. The dispersion of the silicate layers in the APES/TPS hybrids were characterized by using X-ray diffraction and transmission electron microscopy. Tensile and barrier prop…
The effect of surface modification prior to cerate coatings on the corrosion behavior of magnesium was investigated. A series of samples were modified under different conditions before ceria treatment. Electrochemical impedance spectroscopy and polarization measurements were used to determine the optimum conditions fo…
A detailed study of guided modes in a nanoscale metallic rectangular waveguide is presented by using the effective dielectric constant approach. The guided modes, including both traditional waveguide mode and surface plasmon mode, are investigated for the silver rectangular waveguide. The mode evolution in narrow wave…
Abstract Hexa transition-metals incorporated polyoxotungstoarsenates, [M6(H2O)2(AsW9O34)2(AsW6O26)]17− (M2+ = Mn2+, Co2+I, Zn2+), have been prepared at pH 7–8 and characterized by elemental analysis, electrochemistry, and X-ray crystallography: Na17[Mn6(H2O)2(AsW9O34)2(AsW6O26)]·41H2O (1), P21/c, a = 17.73(1) Å, b = 2…
The thermal decomposition of metal-substituted ammonium aluminium carbonate hydroxide (AACH) materials with dawsonite-like structure has been studied by using in situ XRD, FT-IR, TGA, and TPD-MS in the temperature range 298–1573 K. The in situ approach enables accurate monitoring of the decomposition process and the n…
The synthesis of polyphenylene dendrimers with backbone-pendant internal carboxylic acids and nonpolar tetraphenylbenzene chain ends is reported. The host–guest and transport properties of these dendrimers with proflavine, an acridine dye, were investigated. These properties were found not to depend strongly on the nu…
The dielectric susceptibility of strontium–barium niobate, Sr0.75Ba0.25Nb2 O 6, reveals strong hole-like aging behaviour in its ferroelectric state. The isothermal evolution of the linear susceptibility satisfactorily follows a stretched exponential law. After aging the sample at a selected temperature both rejuvenati…
Asymmetric alpha-substituted dipyrrins have been synthesized and characterized. The compounds were formed by a metal mediated reaction involving a single alkoxy group substituted into the alpha-position of an alpha,beta-unsubstituted dipyrrin. An alpha-methoxy dipyrrin, 5-(4-cyanophenyl)-1-methoxydipyrrin (alpha-OMe-4…
A novel modified nanocomposite was studied for the adhesion and proliferation of the human umbilical vein endothelial cell (HUVEC) line EA.hy926. The nanocomposite under investigation was poly(carbonate-urea)urethane with silsesquioxane nano-cages, here in the form of a mixture of two polyhedral oligomeric silsesquiox…