Materials Literature
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The atmospheric pressure chemical vapour deposition (APCVD) reaction of VCl4 or VOCl3 with cyclohexylphosphine at substrate temperatures of 600 °C deposits thin films of amorphous vanadium phosphide. The films are black–gold, hard, chemically resistant and conductive. The APCVD reaction of MCl5 (where M = Nb or Ta) wi…
Abstract Removal of gold from basic solutions containing [Au(CN) 2 ] − has been demonstrated using the inherently conducting polymer polypyrrole. Polymers containing sulfonated aromatic dopants have been found to display a significant ability to remove gold from such solutions. Experiments performed in solutions conta…
In this paper we examined the electrical and optical properties of a new composite device containing layers of a nematic liquid crystal and cellulose derivative. Using the thermally stimulated depolarization current (TSDC) method we obtained information regarding the conduction mechanism, the activation energy, and th…
Raman spectra in SrTiO 3 single crystals were measured. In the ferroelectric phase below T c = 24 K in SrTi 18 O 3, two modes were observed to soften on heating towards T c = 24 K. These modes are assigned as the two split components of the ferroelectric soft E u -symmetry mode in the tetragonal phase above T c . The…
Multi-component micropatterned organosilane monolayers are fabricated on a Si-wafer substrate by stepwise site-specific vacuum ultraviolet (VUV)-ray photodecomposition and chemisorption. The introduction of different organosilane components is confirmed by X-ray photoelectron spectroscopy (XPS). Atomic force microscop…
The combinatorial approach is widely used for homogeneous and heterogeneous catalyst development. The main key technologies are “combinatorial chemistry (CC)” for material preparation and “high-throughput screening (HTS)” for rapid assay using automated and/or robotic equipment. A HTS reactor with 96 parallel lines wa…
The growth kinetics of the β-Ti solid solution phases in several pure metal diffusion couples have been investigated. The layer growth of β-Ti solid solution phases is observed to obey the parabolic law, indicating that the rate controlling process is diffusion. The temperature dependence of the rate constant of the l…
This article reviews the recent research development in the electrolytic production of carbon nano-tubes in molten salts. The experimental procedure and product morphologies of the electrolytic method are described in details. Different hypotheses of the carbon nano-tube formation mechanism in molten salts, particular…
A procedure to increase the adhesion of block styrene-butadiene-styrene (SBS) rubber consisting of the reactive grafting with maleic anhydride (MA) in the presence of an organic peroxide radical initiator is proposed. The influence of the reactive grafting on the surface properties of SBS has been studied with special…
Electronic structure and effect of grain size on the electron transport and magnetic properties of La0.85Na0.15MnO3 thin films and polycrystalline bulk have been investigated. As the grain size decreases, the magnetic transition temperature region becomes broad and the metal–semiconductor transition temperature shifts…
We have determined all five independent elastic-stiffness coefficients Cij of a silicon carbide fibre with transverse isotropy from room temperature up to 873 K. Firstly, we measured the Cij of a titanium-alloy-matrix composite reinforced unidirectionally with the fibres and the matrix alloy alone. Electromagnetic aco…
In this case report, the authors, after reviewing the literature data about contrast agents in Magnetic Resonance Imaging (MRI) and correlated problems, investigate the immunological mechanism of an adverse reaction to gadopentetate dimeglumine (Gd-DTPA), in order to demonstrate an IgE-mediated immunological pathogene…
Surface of high nitrogen-bearing austenitic stainless steel was analyzed by using X-ray photoelectron spectroscopy (XPS). Test specimen was 23 mass%Cr-4 mass%Ni-Mo-free-1 mass%N stainless steels produced by nitrogen gas pressurized electroslag remelting (P-ESR) equipment. The specimens were polarized electrochemically…
Biodegradable polymeric nanoparticles hold great potential a pp lication in drug delivery systems.This review presents the most outstanding con tributions in the field of biodegradable polymeric nanoparticles used as drug de livery systems.Methods of preparation,drug loding ,,surface modification and su rface characte…
High temperature oxidation of Y2O3-partially stabilized ZrO2 composites dispersed with Ni particles was investigated at temperatures ranging from 873 to 1073 K in air. Cracks between Ni particles forms parallel to the surface during high temperature oxidation. Thickness of the cracked zone increases proportionally wit…
The joining of a sapphire single crystal plate to alumina ceramic tube is fabricated successfully using 34CaO·30Al2O3·36SiO2 glass as an interlayer. This glass showed good adhesion performance to alumina ceramics and sapphire single crystal. The joint with no crack was obtained by heating at 1550°C for 10 min and slow…
The effect of the surface concentration of submicrometer ammonium sulfate ( NH 4 ) 2 SO 4 dust particles on the mechanism of atmospheric corrosion of copper has been investigated at 298 K and 93% relative humidity (RH). For surface concentrations from 1 μg/cm 2 to 10 mg/cm 2 , the same corrosion products are formed at…
The advantages of producing 3-D conductive knitted textiles for the purpose of generating heat are enormous. Products may be developed that conform to complex contours providing a uniform heat distribution. Applications can be foreseen in the automotive sector; car seats, driving wheels and the interiors of door panel…
Shape memory alloy (SMA) wire actuators have been increasingly used in various devices and applications due to their high energy density and simple design. With the use of these actuators the questions of size effects on their behavior need to be addressed. This paper presents a study on the cyclic loading behavior of…
In order to investigate the multiplication of equiaxed grains by the forced convection, in-situ observation using a transparent organic substance have been made. The emission of some spherical particles from the columnar zone was observed by a fiber scope installed in an ingot case. These particles are originally the…