Materials Literature
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Novel structured functional hybrid materials can be obtained by incorporating photoresponsive organic components into the silicate walls of periodic mesoporous silicates. Two such materials are described, containing either viologens or stilbene analogs. Thermal or photochemical activation of viologen units generates t…
The refractive index modification of polysilane films by the Ultra-Violet (UV) light irradiation was investigated. Poly(methylphenylsilane) (PMPS) and other polysilanes involving phenyl group attached directly to a silicone atom showed high refractive index (ninit ∼ 1.70) and very large refractive index reduction (Δn…
Hydrogen storage alloys are attracting worldwide attention as hydrogen suppliers to fuel cells. However, several kinetic problems remain to be solved before practical use is possible. A methodology to accelerate reactions of hydrogenation and dehydrogenation and to lower the reaction temperature is strongly required.…
Abstract The second‐order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO‐SOS method. These chromophores are formed by a donor‐π‐bridge‐acceptor system, based on a nitro group connected with benzothiazole as the acceptor and a hydroxyl‐functional amino group…
Dielectric constant measurements at low temperature and X-ray diffraction measurements at room temperature were carried out under high pressure up to 1.42 GPa and 10 GPa, respectively, for a hydrogen-bonded crystal CsH 2 PO 4 . By the dielectric measurements, we found a new antiferroelectric phase (AFE II), that is pr…
A new approach for the synthesis of a new type of ternary mesoporous La–Co–Zr mixed oxides with various atomic (La + Co/La + Co + Zr) ratios is reported. The synthesis method combines the advantages of the preparation of the clear soluble homogeneous metal oxides containing a cationic surfactant in acidic medium follo…
Age-hardening characteristics in a dental low-gold alloy composed of 40.0 wt% Au-35.0 wt% Ag-7.9 wt% Pd-7.0 wt% Cu-5.0 wt% In-3.5 wt% Zn-1.5 wt% Sn, were investigated by means of the hardness test, XRD study, SEM observations and EPMA. The following results were obtained. The age-hardening was characterized by a preci…
Micro- and nanomachining cutting tools are currently being developed in order to extend the range of manufacturing technologies available to the micro and nano engineer. Conventional diamond tools used for grinding operations have a number of problems associated with heterogeneity of the crystallites, decreased cuttin…
There are many alternatives for the refractory lining in the sole of an electric arc furnace that produces re-fined ferromanganese, Fe-Mn (80% with low carbon content, %C<1.5). Empiric approaches have usually been used for the design. Even though they allowed increasing the number of tapping, they are not base in a qu…
The synthesis of polyurethanes (PURs) from oligoetherdiol, two low molecular diols, castor oil and 4,4'-Methylenebis(cyclohexylisocyanate) is described. These polymers are characterized by measurements of the mechanical bulk and surface properties, preliminary investigation of compatibility with human blood and calcif…
Germano-silica and alumino-silica Erbium Doped Fibers have been fabricated through a new Nanoparticles Doping process with MCVD technology. These fibers have been characterized in WDM amplification experiments in both C and L band.
Originally, the demands in space technology played the decisive role in the development of ceramic matrix composite (CMC) materials. High mass-specific characteristics and extreme temperature resistance are important selection criteria for materials used in jet engines and thermal protection systems of new space-craft…
It has been well documented that bacteria will readily proliferate during the typical soaking process if left unchecked. Tanners are rightfully concerned about the extent of biological activity in their soaking process and the impact this can have on the grain integrity and strength of the resulting leather. However,…
Sequential interactions between several adhesion molecules and their ligands regulate lymphocyte circulation and leukocyte recruitment to inflammatory foci. Adhesion molecules are, therefore, central and critical components of the immune and inflammatory system. We review the evidence that tobacco smoking dysregulates…
Some novel 2-benzylbenzoxazoles and 2-benzylbenzothiazoles, substituted at the 2′ position by electron-withdrawing groups, were synthesized via the lithiation of the benzoxazole or benzothiazole ring. The expected reversible photoinduced proton-transfer reaction of such compounds was studied.
The corrosion behavior of magnesia-carbon (MgO-C) refractories used in slag lines of secondary steelmaking vessels was investigated using a slag test at high temperature under a protective atmosphere of argon or argon and carbon monoxide. For the investigation, a test method was developed and a statistically designed…
New acrylic polymer containing silk protein was synthesized by copolymerization of acrylonitrile and silk fibroin peptide with vinyl groups, and its solubility, thermal property, and moisture absorption were investigated. This polymer has a covalently cross-linking structure, and its excellent thermal stability and be…
The relation between input magnetic field and output strain by the giant magnetostrictive actuators exhibits nonlinearities and hysteresis.To control and use the actuators, it is necessary to establish an accurate model of the actuators. This paper founded hysteretic and nonlinear dynamic model for the actuators based…
In recent years there has been an increasing interest in using natural fibers as reinforcements for biodegradable plastics from the environment-friendly viewpoint. In this study the mechanical properties of bamboo fibers extracted by a steam-explosion method has been investigated by means of the tensile test. From the…
Polycrystalline ZnO films with a good preferred orientation were deposited on sapphire, Si and quartz substrates by rf magnetron sputtering. A 356 nm Ultraviolet (UV) photoluminescence (PL) peak and a 446 nm blue peak were observed at room temperature when excited with 270 nm light. After high-temperature annealing in…