Materials Literature
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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…
Abstract Polymerizable gelator 1 which has two diacetylene groups as well as two amide groups showed an excellent gelation ability for many organic solvents. Photoirradiation readily induced polymerization in the gel phase but the polymerization results were dependent upon the gelation solvent. It was shown that the t…
That there is no valence variation of Fe and Cr ions in stoichiometric spinel ${\mathrm{FeCr}}_{2}{\mathrm{S}}_{4}$ is directly proved by the experiments of powder x-ray diffraction, transmission electron microscopy, M\"ossbauer spectrum, x-ray photoelectron spectroscopy, and electron-spin resonance. These results con…
La 4 Cu 3 MoO 12 is a new (ABO 3 ) n =4 cuprate with mixed B -cations in a ratio of 1:3. When synthesized at ambient pressure, the structure is not perovskite as expected but rather a homeotype of YAlO 3, a rare-earth hexagonal phase. While the P 6 3 / mmc and Pmnm space groups can be used to model average structures…
Lead magnesium niobate (PMN) of high sintered density has been successfully prepared by a mechanochemical fabrication technique from mixed oxides of PbO, MgO, and Nb 2 O 5 . The novel technique skips the phase‐forming calcination steps at intermediate temperatures that are almost always required in the most widely emp…
A procedure for designing binary diffractive lenses by use of pulse-width-modulated subwavelength features is discussed. The procedure is based on the combination of two approximate theories, effective-medium theory and scalar diffraction theory, and accounts for limitations on feature size and etch depth imposed by f…
A metal-organic chemical vapor deposition process has been developed for the growth of amorphous tungsten nitride thin films for barrier layer applications in ultralarge scale integration copper interconnect schemes. The process employs tungsten hexacarbonyl, [W(CO)6] and ammonia (NH3) as, respectively, the tungsten a…
Immobilization of lactate dehydrogenase (LDH) has been carried out on electrochemically prepared polyaniline (PANI) films. The results of the photometric and amperometric response measurements conducted on such LDH/PANI electrodes show the response time as 90 s and shelf-life as about two weeks at 4–10 °C indicating t…