Materials Literature
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The thermal behaviour of CdS nanoparticles and especially of their surfaces has been investigated by high resolution photoelectron spectroscopy. Different annealing characteristics were observed for particles of different sizes. From the changes of surface core-level shifts in the S 2p and Cd 3d5/2 spectra we derive t…
At 1050 ?C boron combines with sodium forming a boride of formerly unknown composition and crystal structure. The investigation of the homogeneous, monophasic, and crystalline powder was performed using X-ray (23 ?C) and neutron (–271.5 ?C) diffraction methods. The structure solution led to an unusual arrangement of b…
We propose stratified volume diffractive optical elements as a new type of diffractive optical element that is capable of functioning as a high-efficiency grating in applications with requirements not suited to traditional holographic or diffractive optical techniques. In this approach, diffractive optical fabrication…
Neutron diffraction and magnetic susceptibility experiments were performed on single crystals of the doped Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3+\ensuremath{\delta}}.$ The magnetic properties of the three-dimensional correlated electron system were investigated upon hole doping. The size of the ordered moment of…
Abstract Thin films including Methylene Blue (MB) have been prepared. They were dip-coated using the sol–gel reaction of tetraethyl orthosilicate (TEOS). The absorption spectra of the individual thin films have been observed as a function of time after preparation of the films. The relative contributions of the monome…
The oxidation stability of low density polyethylene to UV light has been studied in the presence of various types of antioxidants (hindered phenols, HALS and synthetic N-alkylamines). A chemiluminescence procedure has been applied. Kinetic parameters of oxidation are obtained from isothermal measurements at 180 °C. Th…
The main aim of this contribution is characterization of fabric porosity by the light transmission and comparison of this characteristic with air permeability and idealized geometrical structure of selected weaves. For characterization of air permeability the classical apparatus has been used. The transmission of ligh…
Measurements of magnetization and magnetoresistance have been made for crystals of ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}{\mathrm{MnO}}_{4}$ with use of pulsed magnetic fields up to 40 T. Application of high magnetic field causes metamagnetic transitions below 217 K and concomitantly the colossal magnetoresistance ef…
The so rbent power of hydrotalci te compound [Mg3AI (OH)g hCO)XH20 for Cr(VI ) fr om water solution has been evalu ated. The adsorption behaviour of Cr(VI) was investigated at different initial concentration of adsorbate, co ntact time, pH, temperature and adsorbent dose by batch equilibrium technique. The extent of a…
L'effet de l'addition de certains composés organiques de type triazine sur la corrosion d'un acier en milieu H3PO4 2M a été étudié à l'aide des méthodes électrochimiques et gravimétriques. Les résultats obtenus ont montré que la vitesse de dissolution de l'acier dépend de la structure moléculaire et de la concentratio…
A thermal stable aromatic polyimide (PI) with side-chain second-order nonlinear optical (NLO) chromophores has been developed. The PI was prepared by the ring-opening polyaddition of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride with a new diamine having two N-ethyl-N-[4-[(6-chlorobenzothiazol-2-yl)diazenyl]phen…
The adsorption, decomposition, and oxidation of ethanol on Pd(110) has been studied using high-resolution x-ray photoelectron spectroscopy (XPS) and temperature-programmed XPS. The decomposition pathways of ethanol on the clean surface (to methane, hydrogen and carbon monoxide; and to methane, hydrogen, and carbon and…
In this study, oxide ion conduction characteristics of doubly doped PrGaO 3 were investigated. It is found that PrGaO 3 doped with Sr (or Ca) for the Pr site and Mg for the Ga site exhibits the high oxide ion conduction which was slightly less than that measured for doubly doped La ( Sr ) Ga ( Mg ) O 3 (LSGM). Doping…
The microstructure and properties of Cu films containing insoluble Mo in as-deposited and annealed conditions have been studied. Using magnetron sputtering, Cu films with Mo concentrations up to 25 at. % have been deposited. The Cu-Mo films consist of nonequilibrium supersaturated solid solutions of Mo in Cu and have…
It is shown that the strain field of an edge dislocation in a smectic crystal must be described in the framework of nonlinear theory, even far away from the core region. We present an exact solution of this nonlinear problem. The result of the linear theory is recovered in the limit of large bending rigidity.
Abstract A series of pure α,ω-alkanediols HO-(CH2)n-OH (n = 13—24) was prepared and the effects of chain length and parity on their thermal properties were investigated. Crystal structures of odd α,ω-alkanediols were orthorhombic, while those of even α,ω-alkanediols were monoclinic. α,ω-Alkanediols with n = 13—24 show…
Chemical conversion and morphological evolution of PA-6/EPM/EPM-g-MA blends along a twin screw extruder were monitored by quickly collecting small samples from the melt at specific barrel locations. The results show that the MA content of all blends decreases drastically in the first zone of the extruder, i.e., upon m…
A series of semifluorinated 1-bromoalkane (SFBA) mesogens have been synthesized and characterized to better understand their solid state crystalline and liquid crystalline structures. In the solid state, the local conformation of the fluorocarbon segments becomes disordered once the fluorocarbon chain reaches a length…
In this paper, we investigate the final morphology of photocured polyurethane acrylates based on polypropylene oxide by means of Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS), and dynamic mechanical measurements. Two interrelated structural features on two different size scales can occur…
This article describes a new kind of electrostatic charged particle analyzer capable of the parallel detection of a large kinetic energy range. The main purpose envisaged is for the simultaneous detection of electrons scattered from surfaces and having energies between a few tens of eV to greater than 2000 eV. A proto…