Materials Literature
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We have investigated the structural, optical, and vibrational properties of strained heteroepitaxial ZnO layers by high resolution x-ray diffraction, reflectivity, and Raman measurements. The ZnO layers were grown by metalorganic vapor phase epitaxy on sapphire substrates under varying growth conditions. A Poisson num…
Nanoscale Au/Fe 2 O 3 catalysts for CO oxidation were prepared by a deposition–precipitation technique using the thermal decomposition of urea. Freshly precipitated amorphous Fe(OH) 3 was used as a support. The resulting products were characterized by transmission electron microscopy and x-ray powder diffraction. The…
We introduce in this paper a phenomenological model (Havriliak-Negami function) to describe the relaxation of the intercalated Li ions into amorphous WO3 electrochromic films. Kinetic behavior of intercalation was analyzed by a combined measurement of electrochemical impedance and modulated transmittance. The frequenc…
Silver nanoshells on styrene–acrylic acid copolymer latex spheres (PSA) were deposited by an in situ chemical reduction method, ageing a colloid solution at 85 °C containing PSA latex, AgNO 3 , urotropine, and poly-(vinylpyrrolidone). SEM and TEM observations showed that the silver nanoshells were made of closely pack…
Undecanuclear copper clusters, [Cu(11)(micro(9)-Se)(micro(3)-Br)(3)[Se(2)P(OR)(2)](6)] (R = Et, Pr, (i)Pr) (1a-c), were isolated along with closed-shell ion-centered cubes, [Cu(8)(micro(8)-Br)[Se(2)P(OR)(2)](6)] (PF(6)) (2a-c) and [Cu(8)(micro(8)-Se)[Se(2)P(OR)(2)](6)] (3a-c), from the reaction of [Cu(CH(3)CN)(4)](PF(…
The crystalline structures of polyesters 4 8, 4 10, and 4 12 have been studied using X-ray and electron diffraction and real space electron microscopy. They belong to the series of polyesters derived from 1,4-butanediol and even-dicarboxylic acids. This work allows the previously reported data on polyesters 4 4 and 4…
Networks consisting of one-dimensional ZnO nanowires and two-dimensional ZnO nanowalls were synthesized using a catalyst-free low-temperature approach. The size of the nanostructure was much smaller than that obtained by the previous catalyst-assisted method. The nanostructures exhibited stable excitonic states at roo…
Calcium phosphates are among the most important biominerals in living organisms, where they play both a mechanical and a calcium storage role. Their growth in vivo is under strong biological control, and this process occurs in closed spaces. Our aim in this paper is to describe a microreactor system able to control th…
Electrical properties of damascene silver wires with widths between ≈60 and 840 nm and heights between ≈100 nm and 300 nm are presented. The superconformal electrodeposition process by which the seam-free and void-free metallizations were fabricated is summarized. The chemical-mechanical polishing plus oblique ion spu…
We report a method for the growth of single-phase epitaxial thin films of compounds from the family of Heusler alloys Co2Cr1−xFexAl. Elemental targets were dc magnetron sputtered in 1.5 mtorr Ar gas onto MgO substrates held at 500 °C at a total growth rate of ≈0.8 Å/s. As the Fe content increases, the structural quali…
Cobalt(II) compounds [Co(pyterpy)Cl(2)].MeOH (1.(MeOH)) and [Co(pyterpy)Cl(2)].2H(2)O (1.(2H(2)O)) were synthesized. The compound 1.(MeOH) forms the quasi 3-D networks by making pi-pi stacking between the 1-D chains. The methanol molecules from 1.(MeOH) can be removed by heating, and substituted by absorption of water…
The three- and two-coefficient Cauchy equations are derived based on the three-band model for the wavelength- and temperature-dependent refractive indices of anisotropic liquid crystals. For high birefringence (Δn⩾0.2) liquid crystals, the three-coefficient Cauchy model fits experimental results more accurately than t…
We report on the characterization of Gd2O3 nanocrystals of different sizes doped with 2.5 at. % Eu3+ ions. The particles have been synthesized by a sol-lyophilisation process. This method allows the synthesis of 7–100 nm diameter cubic-phase particles. The photoluminescence properties have been studied from visible to…
Nanomicron to submicron fibers of GeO(2) have been prepared using poly(vinyl acetate) and germanium dioxide sol by electrospinning followed by high temperature calcination. The morphology of the fibers have been studied by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. X-r…
Lead zirconate titanate [Pb(ZrxTi1−x)O3, PZT] thin films with various compositions, whose Zr/Ti ratio were varied as 40/60, 48/52, 47/53, and 60/40, were deposited on Pt(111)/Ti/SiO2/Si substrates by sol-gel method. A seeding layer was introduced between the PZT layer and the bottom electrode to control the texture of…
The complex permeability and permittivity, the relationship between dynamic and static properties, and attenuation properties have been studied for BaZn2−xCoxFe16O27 composites with x=0.7–2.0. The results show that the resonance frequency fR is controlled by the out-of-plane anisotropy field Hθ, and the static permeab…
By using multiwalled carbon nanotubes as an element of a nanobiprism, we evaluated quantitatively the coherence of electrons emitted from tungsten tips at room temperature and 78 K, and found an enhancement of coherence at 78 K. The increase of the transverse coherence length of the electron beam agreed well with that…
Abstract In this study, the nylon 6/foliated graphite (FG) electrically conducting nanocomposites with a low percolation threshold of less than 0.75 vol % have been prepared via an in situ polymerization approach in the presence of FG nanosheet filler. Based on laser counting, scanning electron microscopy, transmissio…
Two copper(II)-gadolinium(III) metal complexes of formula CuIIGdIIILX3 are reported. H2L stands for the Schiff base ligand obtained by condensation of 3,4-dimethoxysalicylaldehyde with ethylenediamine (complex 1) or 1R,2R-(+)-1,2-diphenylethylenediamine (complex 2). While 1 reveals a centrosymmetric crystal structure,…
The effects of a salt mixture consisting of a salt-out salt (NaCl) and a salt-in salt (NaI) on the sol-gel transition of methylcellulose (MC) in aqueous solution have been studied by means of micro differential scanning calorimetry and rheometry. The salt mixture was found to have a combined effect from the salt-out a…