Materials Literature
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Abstract The atomic force microscopy (AFM) technique is a powerful tool for studying surfaces and has been used to provide qualitative and quantitative information about nanometer‐scale matter properties that are often inaccessible by any other experimental technique. In this work AFM was used to evaluate the surfaces…
The dielectric properties of thin films with microemulsion (ME)-routed nanocrystalline BaTiO 3 particles were investigated in terms of the films' crystallinity and grain size. The ME method provided a clear emulsion of well-dispersed nanocrystalline BaTiO 3 particles. BaTiO 3 thin films were prepared by direct spin-co…
Lead titanate (PbTiO 3 ) thin film is a promising material for ultrahigh-density ferroelectric data storage systems, pyroelectric sensors and ferroelectric optical devices. In this study, high-quality epitaxial PbTiO 3 thin films were deposited on SrTiO 3 (100) and SrRuO 3 /SrTiO 3 (100) by a hydrothermal method. The…
Liquid crystal (LC) lens arrays are prepared using hexagonal-hole-patterned electrodes. Two lens array structures are studied. The LC lens arrays have a focal length that is tunable by adjusting the applied voltage. By using the electrodes with the hexagonal-hole arrays, the aperture of the lens array can be increased.
The defects of cBN single crystals were characterized by their optical absorption and etch-pit density. The crystals were synthesized by using temperature gradient method under high pressure. Compounds of alkali metal and/or alkali earth metal–boron nitride and metal of Ni–Al alloy were used as solvent for the crystal…
We investigated the complementary effects of TiO/sub 2/ and MoO/sub 3/ additives on the magnetic properties, the core loss, and the dielectric properties of MnZn ferrites. We analyzed the composition factors influencing the permeability of MnZn ferrites. A high initial permeability base ZnO-MnO-Fe/sub 2/O/sub 3/ compo…
Abstract The aim of this paper is to show possibilities of experimental methods of polymer diagnostics and fracture mechanics for quantitative characterization of crack initiation and propagation properties of elastomeric materials. At first, a general overview of methods of technical fracture mechanics is given. This…
Abstract Kaolinites were modified by controlled hydrothermal deuteration. Both infrared and near infrared vibration spectra of deuterated kaolinite were investigated by Diffuse Reflectance Infrared Fourier Transform spectroscopy. The stretching vibrations ( v ) of deuteroxyl groups of the kaolinite were observed at 27…
In-process ATR FTIR spectroscopy is used to measure concentration and supersaturation in drowning-out of benzophenone from methanol/water solution and to study the effect of the rate of the aqueous antisolvent addition. A selected peak ratio in terms of IR transmittance or absorbance is monitored on-line and used to d…
Chiral media engineered for applications at microwave frequencies can be described as metamaterials composed of randomly oriented helices (with sizes typically less than a wavelength) embedded within an achiral background that is characterized by its permittivity and permeability. Chiral metamaterials embody propertie…
The electron charge density distributions of simple perovskite oxides, Pb B O 3 ( B = Ti, Zr and Hf), in their cubic phase are investigated by analyzing high-energy synchrotron powder diffraction data by the maximum entropy method (MEM)/Rietveld method. Clear structural differences between the antiferroelectric and fe…
Progress in sidewall morphology smoothing of Si wire waveguides by thermal oxidization was observed using a focused-ion-beam (FIB) transmission-electron-microscopy technique. The roughness of Si∕SiO2 interface was drastically reduced with increasing oxidation time and temperature. Deformation of the cross-sectional pr…
The room temperature dielectric permittivity of [100] oriented 0.37BiScO 3 -0.63PbTiO 3 (BSPT63) crystals with a morphotropic phase boundary (MPB) composition was found to be 1400, lower than that of BSPT57 crystals with rhombohedral phase (∼3000), but much higher than that of the tetragonal crystal BSPT66 (∼200). The…
Poly(DL-lactide-co-glycolide) (PDLLGA) and poly(L-lactide-co-glycolide) (PLLGA) copolymers were prepared by bulk ring opening polymerization of lactide and glycolide and characterized by GPC, FTIR, 1H NMR and DSC. Copolymers with different molar masses at a constant lactide/glycolide ratio were used for preparation of…
Pseudomonas aeruginosa PAO1 mutants affected in the ability to degrade acyclic isoprenoids were isolated with transposon mutagenesis. The gny cluster (for geranoyl), which encodes the enzymes involved in the lower pathway of acyclic isoprenoid degradation, was identified. The gny cluster is constituted by five probabl…
Mars sample return missions and eventual human missions will both benefit from using Martian resources to produce Earth-return propellant and life support consumables. A new architecture for an in situ propellant production plant is introduced that utilizes solid oxide electrolysis to perform the combined electrolysis…
Electrical transport in vertically aligned films of multiwalled carbon nanotubes has been investigated in the -150 degrees C to 300 degrees C temperature range (all the tests were conducted in air at atmospheric pressure). In all the cases, the nanotube film exhibited a semi-conducting behavior, with the film resistan…
We have succeeded in the preparation of a broad set of epitaxial Sr2FeMoO6 thin films by pulsed laser deposition. We have studied the effect of various deposition conditions, on both substrate-induced strain and antisite disorder (ASD), which translate into a variety of magnetic and transport properties of the films.…
We present an approach to study the self-assembly of organic macromolecules, based on all-atom empirical force field calculations. The approach is applied to self-assemblies of zwitterionic peptide amphiphiles possessing large dipoles in their hydrophilic headgroups. The assembly is built from the bottom up by first o…
Versatile building blocks for the construction of molecular models for heterogeneous catalysts are readily available in high yields in the form of fully metalated silsesquioxane derivatives, such as dimeric 1, by using alkali-metal silylamides as deprotonating agents.