Materials Literature
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Epoxy resin systems with different amounts of hardener were prepared. Bisphenol A type epoxy resin prepolymer was used and the hardener was m-xylylenediamine. Specimens were immersed in water, 10wt% sulfuric acid solution and 10wt% sodium hydroxide solution at 80°C. The epoxy resins showed high corrosion resistance to…
Development of a Novel Electrochemical Method to Deposit High Corrosion Resistant Silicate Layers on Metal Substrates , Veeraraghavan, Basker, Haran, Bala, Slavkov, Dragan, Prabhu, Swaminatha, Popov, Branko, Heimann, Bob
This paper demonstrates howthe rotational foam molding process can be employed for the manufacture of plastic articles that have a distinct layer of nonfoamed skin surrounding a foamed core or layer. It is focused on the singlestep processing principle, the main feature of which is the simultaneous introduction of bot…
The outcome of high-energy collisions of tetrathiafulvalene radical cations, TTF˙+, strongly depends on the nature of the collision gas. Thus, bond cleavage of the central fulvalene bond is promoted by an inert gas, such as helium, whereas oxidation to the dication is a significant reaction channel when molecular oxyg…
Two types of diffusion couples, U–23 mol%Zr with U–23 mol%Zr–1.3 mol%Ce and U–95 mol%Zr with U–23 mol%Zr–1.3 mol%Ce, were annealed isothermally at 1123 K and 1023 K in order to provide basic data on Ce diffusion in U–Zr alloys, which are the fuel forms for advanced nuclear reactors. Because the Ce solubility in the U–…
Abstract The structure and stability of periodic solid phosphorus carbide phases P 4 C 3+8 n ( n = 0–4) are studied at zero and high pressure using periodic density functional theory as implemented in the codes SIESTA and CASTEP. For each composition a range of structures is examined, including both defective diamond‐…
The objective of our work has been the microencapsulation of dyes with lecithin from soybean, with the formation of liposomes, as a substitute for synthetic auxiliaries so as to improve the quality of the effluent. Current scenarios promote the disintegration and leakage of the liposomes, such as, changes in temperatu…
Acid-catalyzed oligomerization of 2-(hydroxymethyl)pyrroles bearing C6F5, 2,6-Cl2C6H3, CF3 and CO2Et groups at beta-positions was examined. The reaction of ethyl pyrrole-3-carboxylates gave a mixture of oligomers and type I isomers of porphyrinogens and hexaphyrinogens were isolated when the other beta-substituents we…
Direct experimental evidence is given to show that the traditional viewpoint of polarization reversal must be modified to include the path of consecutive non-180° domain switching. Using ultrasonic waves, we have successfully monitored multi-domain formation during the polarization switching cycle in a bulk single cry…
The load transmission capability of adhesive joints can be improved by increasing the surface free energy of the adherends with surface treatments. In this paper, suitable plasma surface treatment conditions for carbon/epoxy composite adherend were investigated to enhance the strength of carbon/epoxy composite adhesiv…
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…