Materials Literature
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The photoswitching behavior of polyethylene glycol-based hydrogels was determined by monitoring the changes in their swellability and absorption spectra upon exposure to alternating wavelengths of irradiation. Highly hydrophilic PEG-based hydrogels were prepared by the irradiation of a cinnamylidene acetate-terminated…
The low temperature (–100 °C) X-ray structure of the complex K2[Yb(DTPA)(H2O)] has been determined. The metal ion is at the center of a tricapped trigonal prism and is nine-coordinate, binding to the three nitrogens and five oxygens of the ligand and one water molecule. From the structure obtained, three well-defined…
This paper deals with the engineering design of woven fabrics for both domestic and industrial applications. A software program, MECHFAB, is developed to optimize fabric structural parameters based on specifications of the eight most commonly used physical and mechanical properties. In order to find the most economica…
Self-diffusion of both constituents in the Laves phase NbCo2 has been explored using the tracer method and the radioisotopes 57Co and 95Nb in combination with sputter and grinder sectioning. The temperature dependences of the Co diffusivity in Nb31Co69 and Nb29Co71 (two compositions inside the phase field of NbCo2) an…
The optical constants of tetrahedral amorphous carbon (ta-C) films in the infrared region and at a wavelength of 633 nm were investigated. The ta-C films were prepared by the filtered arc deposition technique under different carbon ion energies of 22–320 eV. The ta-C films contained high sp3 bonding of 82%–93% and had…
Director configurations of nematic liquid crystalline molecules packed in ellipsoidal domains have been investigated using mesoscale modelling techniques. Interactions between the directors were described by the Lebwohl-Lasher potential. Four different ellipsoidal shapes (sphere, oblate spheroid, prolate spheroid, and…
The infrared luminescence of Er3+ ions has been studied in bulk crystals of silicon carbide 6H-SiC doped with erbium in the process of their growth. The erbium centers of different symmetry in the crystals are revealed by the EPR technique. A number of intense luminescence bands of erbium ions are observed at a wavele…
Abstract Application Specific Integrated Lenses (ASILs), based on a unique holographic polymer dispersed liquid crystal (H‐PDLC) material system offering high efficiency, fast switching and low switching voltage are being developed for display and telecommunication applications. The basic properties and key benefits o…
X-ray natural circular dichroism (XNCD) has been recently detected in the XANES region for uniaxial and biaxial gyrotropic crystals. Chiral-EXAFS (chi-EXAFS) spectra are reported for the first time over a wider energy range and are analysed in terms of multiple-scattering paths of relevant symmetry. For such heavily a…
AlN–SiC solid solutions were synthesized via a combustion nitridation process. Reactions between powder mixtures of aluminum, silicon, and carbon or aluminum with β‐SiC and gaseous nitrogen under pressures of 0.1–8.0 MPa are self‐sustaining once they have been initiated. Investigations were made with reactant ratios o…
Upon excitation of the metastable electronic state $S\mathrm{I}$ by irradiation with light in the blue-green spectral range at temperatures below $T=200$ K the electron density in the $[\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NO}{]}^{2\ensuremath{-}}$ anion is rearranged mainly in the region of the Fe-N-O bonds, resulti…
A systematic database of thin-film measurements on aluminum films by electron probe microanalysis is presented. The measurements were performed between 3 and 30 kV accelerating voltage on films of six different nominal thicknesses, ranging from 100 up to 3200 Å, which were deposited simultaneously on 20 different subs…
A triclinic phase of tricalcium silicate (TI) was investigated using transmission electron microscopy (TEM). Electron diffraction patterns were analyzed by introducing a subcell with the cell parameters of a = 7.081 Å, b = 7.043 Å, c = 25.230 Å, α= 89.97°, β= 90.37°, and γ= 119.44°. It was proven that the coordinates…
The dielectric and electromechanical characteristics of the (1−x)PMN-xPZT ferroelectric ceramics have been obtained at different temperatures, amplitudes, and frequencies of the measuring field and at different bias field strengths. It is shown that this ferroelectric ceramics at low and infralow frequencies possesses…
CaRuO 3 thin films expected for use as an electrode of ferroelectric random-access memory were prepared for the first time by metalorganic chemical vapor deposition (MOCVD) from the bis(dipivaloylmethanato)calcium(tetraen) [Ca(C 11 H 29 O 2 ) 2 (C 8 H 23 N 5 ) x ]–tris(dipivaloylmethanato)ruthenium [Ru(C 11 H 29 O 2 )…
Raman spectra of the hydroxyl-stretching region of a low defect kaolinite were obtained at temperatures between ambient and the predehydroxylation temperatures of 500 °C, using a Raman microprobe equipped with a thermal stage. At 25 °C, Raman bands of the kaolinite hydroxyl stretching region were observed at 3691, 368…
It is well known that the Cr underlayer plays significant role in the magnetic properties of Co alloy film. In this study, the effects of the underlayer materials such as Cr, Mo, W, W/Cr, and Al and their thickness on the magnetic properties of SmCo films were studied. In the x-ray diffraction diagrams of the SmCo/Cr…
By diluting a ferroelectric columnar liquid crystal with dodecane as apolar organic solvent, soft columnar phases as well as the chiral columnar nematic phase (Nc*) were achieved as lyomesomorphic systems. All obtained lyomesophases exhibited polar switching over a wide temperature range, even down to room temperature…
The effect of carbon doping on the structural and magnetic properties of Mn5Si3Cx films is investigated for different substrate temperatures TS and concentrations x. Samples with x≈0.75 prepared at TS=650–750 K exhibit ferromagnetic order with enhanced ordering temperatures TC well above room temperature in contrast t…
The corrosion performance of sand cast MEZS, zirconium-grain-refined MEZR, sand cast AZ91S, and high pressure diecast AZ91D magnesium alloys were evaluated by means of salt spray testing, optical metallography, hydrogen evolution, polarisation curve measurement and AC impedance spectroscopy. The results show that the…