Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Nanoshell arrays have recently been found to possess ideal properties as a substrate for combining surface enhanced raman scattering (SERS) and surface enhanced infrared absorption (SEIRA) spectroscopies, with large field enhancements at the same spatial locations on the structure. For small interparticle distances, t…
The dimensionless thermoelectric figure of merit (ZT) in bismuth antimony telluride (BiSbTe) bulk alloys has remained around 1 for more than 50 years. We show that a peak ZT of 1.4 at 100 degrees C can be achieved in a p-type nanocrystalline BiSbTe bulk alloy. These nanocrystalline bulk materials were made by hot pres…
The design andsynthesis of basic porphyrin building blocks for the con-struction of highly ordered systems often require incorpo-ration of different peripheral substituents. The synthesis ofporphyrins bearing specific patterns of functionality is stillchallenging task in spite of the ample presence of reportedprocedur…
The spin Hamiltonian (SH) parameters g factors g ‖ , g ⊥ and the hyperfine structure constants A ‖ and A ⊥ for the tetragonal Cu 2+ centers (i.e., [ CuX 4 ( H 2 O ) 2 ] clusters) in NH 4 X ( X = Cl, Br, I ) are theoretically investigated by means of the diagonalization procedure of complete (10×10) energy matrix (DPCE…
Lead(II) 4,4,4-trifluoro-1-phenyl-1,3-butandionate (TFPB−) complexes with 1,10-phenanthroline (phen) and 2,2′-bipyridine (2,2′-bipy), [Pb(L)(TFPB)2], have been synthesized and characterized by elemental analysis, IR-, 1H NMR spectroscopy and studied by X-ray crystallography. The self-assembly of [Pb(L)(TFPB)2] complex…
Current transport in carbon nanotube field effect transistors (CNT-FETs) has been modeled from charge distributions and the potential inside the carbon nanotube. Analytical equations describing I-V characteristics of the CNT-FETs have been obtained from the combination of diffusion and drift mechanisms in the channel…
We report the synthesis and evaluation of thermal behavior of two new mesogenic homologous series of liquid crystalline compound containg 1,2,4-triazole and isonicotinic acid ring at the terminus of the molecule viz. 4-[(4H-1,2,4-triazol-4-ylimino) methyl] phenyl 4-alkoxybenzoate and 4-(2-isonicotinoylcarbonohydrazono…
Abstract The objective of this work is to study the optical and electrical properties of tantalum nitride and tantalum barrier thin films used against copper diffusion in Si in integrated circuits using spectroscopic ellipsometry in the VUV and UV–visible range. Single layers of tantalum nitride and bilayer films of T…
In the nuclear industry, large volumes of liquid wastes with a low radioactivity have to be treated. The method which is commonly applied to remove contaminants consists of the use of an insoluble finely divided solid material formed in situ by precipitation in the waste stream. In this study, a new mathematical appro…
Abstract The dielectric constant (ε′), dielectric loss index (ε″), direct‐current conductivity, and current–voltage ( I – V ) characteristics of pure poly(vinyl chloride) (PVC) and blends of PVC and bisphenol A/Egyptian corncobs (BCC) were investigated at different temperatures. The relaxation processes for PVC and it…
Abstract KDP crystals were rapidly grown from solution doped with different Ba 2+ concentrations. The effects of Ba 2+ on the growth rate, morphology and quality of KDP crystals were discussed. Significant changes in shapes and volume of the grown crystals have been observed. During the growth process, defect region e…
The single mutants (F165A, E192A, F196A, S392A, T393A) at and near the main hinge (beta-strand L) of human 3-phosphoglycerate kinase (hPGK) exhibit variously reduced enzyme activity, indicating the cumulative effects of these residues in regulating domain movements. The residues F165 and E192 are also essential in mai…
Semiconductor, Poly(vinyl pyrrolidone), Chemical reduction, SeleniumElemental selenium (Se) is a narrow band gap (~1.7 eV)semiconductor which has been extensively used in solarcells, xerography and rectifiers. It is also a photoconductorwith a relatively low melting point (~217 °C), high refrac-tive index and high rea…
ZnO/cubic (Zn, Mg)O core–shell heterostructure nanorods with wire-shaped tips have been synthesized via a catalyst-free thermal evaporation process on Si substrates. The average diameters were about 180 nm for nanorods and about 20 nm for tips. Transmission electron microscopy (TEM) investigations revealed that the ti…
Different crown ether Schiff bases were prepared by condensing a different aldehyde with trans-diamino dibenzo 18-crown-6. The physical properties as well as the chemical formulations of these compounds were derived from microanalysis and spectroscopic methods. Phase transition temperatures and the thermal parameters…
Two sandwich-type tungstoantimonates K4Na2H3[Na2K(H2O)2{Cu(H2O)}3(α-SbW9O33)2] · 15H2O (1) and Na4H4[{Ni(H2O)3}2{W(OH)2}2{β-SbW9O33}2] · 23H2O (2) were prepared from aqueous solution by different strategies. They were characterized by X-ray structure analysis, electrochemical analysis, EPR and IR spectroscopy. Both co…
Abstract Cuprous iodide crystals have been grown with decomplexation method in silica gel. Various crystal morphologies, such as polycrystalline aggregate, skeletal, dendrite, hopper crystals and regular tetrahedron crystals, were observed in different growth regions with an optical microscope. Their surfaces were pho…
The melting of a self-organized system composed of classical particles confined in a two-dimensional parabolic trap and interacting through a potential with a short-range attractive part and a long-range repulsive potential is studied. Different behaviors of the melting temperature are found depending on the strength…
Abstract The optical properties of thin films usually depend on the preparation conditions. For example, the microstructure of ion implantation‐caused damage, the grain size of deposited polycrystalline materials, or the porosity of chemically etched silicon largely depend on the parameters of ion implantation, deposi…
We theoretically propose to directly observe the chiral nature of charge carriers in graphene mono- and bilayers within a controlled scattering experiment. The charge located on a capacitively coupled scanning-probe microscope (SPM) tip acts as a scattering center with controllable position on the graphene sheet. Unam…