Materials Literature
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Titanium dioxide nanofibers were synthesized and applied in flexible composite films that are easy to handle and recycle after use. The nanofibers were obtained in a multi-step procedure. First, sodium titanate nanofibers were prepared from TiO2 nanoparticles through the alkali hydrothermal method. In the next step, s…
Mg–Zr–Ca alloys were developed for new biodegradable bone implant materials. The microstructure and mechanical property of the Mg–xZr–yCa [x = 0·5, 1·0% and y = 1·0, 2·0% (wt-% hereafter)] alloys were characterised by optical microscopy, compressive and hardness tests. The in vitro cytotoxicity of the alloys was asses…
Abstract The purpose of this study was to investigate contribution of nanoclays to the flame retardancy performance of a traditional brominated flame retardant compound with various combinations of antimony trioxide and zinc borate. The matrix polymer acrylonitrile butadiene styrene (ABS) was compounded by melt mixing…
On the basis of a simple model, it is shown that a monolayer of adatoms bound by an indirect exchange interaction causes the appearance of an energy gap in the density of states of a two-dimensional substrate. The character of the dependence of the π and π* bands and band gap on the position of the adatom level is ana…
Ferroelectric perovskites and polymers that are used in a variety of electronic, ultrasonic, and optical applications are often wide-band-gap semiconductors. We present a time-dependent and thermodynamically consistent theory that describes the evolution of polarization and space charges in such materials. We then use…
Single crystal, needle shaped samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. X-ray diffraction and both dc and ac magnetic measurements are described. The unit cell volume changes significantly with dilution, from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46…
Abstract The synthesis of a family of polymer stars with arms of varied tacticities is discussed. The effect of polymer tacticity on the physical properties of these polymer stars is dramatic. Dipentaerythritol cores support six poly(lactic acid) arms. Lewis acidic tin and/or aluminum catalysts control the polymerizat…
We show that a simple change in pore geometry can radically alter the behavior of a fluid-displacing air finger, indicating that models based on idealized pore geometries fail to capture key features of complex practical flows. In particular, partial occlusion of a rectangular cross section can force a transition from…
The differential magnetization of LaCoO 3 in magnetic fields of up to 500 T has been measured at a temperature of 4.2 K. The magnetization curve reveals several features which suggest a complex pattern of the transition of LaCoO 3 from the low-spin state to the high-spin state. The magnetic moment starts to grow in fi…
Aluminum-doped zinc oxide (AZO) thin film is a viable alternative to tin-doped indium oxide, the dominant transparent conducting oxide used in solar cells. The durability of the AZO thin films grown by atomic layer deposition technique, which is known to form layers with atomic layer precision, is studied. The AZO fil…
Dilutely Fe–Mn co-doped SnO 2 was synthesized by a sol–gel method. The co-doping effect enhances the magnetization in comparison with the case of single-ion doping. We found that saturation magnetization values are correlated with the crystalline sizes. Mössbauer spectrometry revealed the magnetic sextet and relaxatio…
The various ways in which the parameters of formula [2] can be simplified give rise to the various methods of Q-PXRD.
Abstract : Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static tests we…
We developed a mathematical analysis method of reflectometry data and used it to characterize the internal structure of TiO2/SiO2/Si and Ti/SiO2/Si stacks. Atomic concentration profiles of all the chemical elements composing the samples were reconstructed from the analysis of the reflectivity curves measured versus th…
Abstract In order to predict correctly stress-strain curve for tensile tests at elevated and cooling temperatures, a modification of a Johnson–Cook (J-C) model and a new method to determine (J-C) material parameters are proposed. A MATLAB tool is used to determine material parameters by fitting a curve to follow Ludwi…
Results of the investigation of the optical properties and of the calculations of the electronic structure of Fe 2 NiAl and Fe 2 MnAl alloys are presented. The main attention is paid to the ellipsometric study of the spectral dependence of the real (ɛ 1 ) and imaginary (ɛ 2 ) parts of the dielectric constant in the ra…
Strontium was introduced into CeO2–ZrO2 mixed oxides (CZ) by doping and impregnation methods, and then Pt was impregnated on the Sr-modified CZ to obtain the catalysts. X-ray diffraction (XRD), X-photon spectra (XPS), high-resolution transmission electronic microscopy (HRTEM) and H2 temperature programmed reduction (T…
Niobium oxide films were evaluated as possible candidates for corrosion resistant biomedical coatings using electrochemical methods. The films were deposited on medical grade stainless steel using a reactive magnetron sputtering system starting from a pure Nb target. The long-term stability of the films was evaluated…
The interaction of the model catalysts Rh/Al2O3, Pd/Al2O3, Pt/Al2O3, and Pt/SiO2 with NO x (mixture of 10 Torr of NO and 10 Torr of O2) was studied by X-ray photoelectron spectroscopy (XPS). Samples of the model catalysts were prepared under vacuum conditions as oxide films ≥100 Å in thickness on tantalum foil with ev…
By measuring as a function of temperature the Leslie thermomechnical coefficient in a compensated cholesteric mixture, we arrived at the conclusion that the Lehmann effect, namely the rotation of cholesteric droplets under the action of a temperature gradient, cannot be explained only by the Leslie thermomechanical co…