Materials Literature
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Electro-oxidative polymerized poly(tris(thienylphenyl)amine)s, which have the hyperbranched (dendritic) structure (PTPA) and linear type (PMeTPA), were investigated for their electrical and magnetic properties. The conductivity PTPA showed was almost one order higher than that of PMeTPA. From the solid state ESR measu…
Melting and crystallization behavior of poly(ethylene oxide) (PEO) with different molecular weight was investigated by modulated‐temperature differential scanning calorimetry (MT‐DSC)—step‐scan alternating DSC. It was found that by separating the reversing and nonreversing components of the (total) heat flow, PEO 1000…
The 70TiO2•30P2O5 (mol%) glass was prepared by the sol-gel method. Its structure was examined by means of IR, Raman spectroscopy and X-ray radial distribution function analysis, and was compared with the corresponding melt-derived glass. It was found that average coordination number of Ti4+ ions was almost 6 and Ti4+…
This paper describes a new method to precipitate the precursor of porous alumina particles by using a porous organic matrix as the template and an enzyme as the precipitant supplier. In this work, the precursor of alumina was precipitated in urease-containing alginate gel spheres dispersed in aqueous solutions contain…
Optical properties of cholesteric liquid crystals with a pitch larger than the wavelength of light are considered. Normal waves of the medium and the Green function of the electromagnetic field are analyzed. A general algorithm based on the application of the Kirchhoff method is proposed for calculating the scattered…
Selective Si etching using HCl in a reduced pressure chemical vapor deposition reactor in the temperature range 800–1000°C is investigated. At 900°C, the etch process is anisotropic, exhibiting the densely packed (100), (311) and (111) surfaces. This behavior indicates that the etch process is limited by surface react…
The polyamino ligand 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane (1) has been used to synthesise two new ligands by Schiff-base condensation with methyl sodium acetyl phosphonate to give ligand L and methyl sodium 4-methoxybenzoyl phosphonate to give ligand L1 in the presence of lanthanide ion as templating agent…
This book is mainly based on the first and second symposia on Nanotechnology in Catalysis held in 2001 and 2002, but it also includes several contributions not presented in the symposia to round out the scope of the subject. The contents are the most up to date developments made by researchers all over the world in th…
Diatoms were identified from the surface sediments of 35 small to intermediate-sized boreal forest lakes in Wood Buffalo Nat. Park, located on the border of Alberta and the NW Terr., Canada. A total of 276 diatom taxa were recorded; of these, 112 taxa, belonging to 29 genera, are illustrated. Detailed taxonomic descri…
In Persian art of the medieval time, the polygonal sub-grid system, which is based on extensive use of geometric constructions, is the only method for which there is documented proof. Artists and craftsmen used this method widely— that exhibited their high skill or collaborations with geometers—throughout the Islamic…
There is an increasing focus on the possibilities of utilizing the absorptive ability of porous materials to create passive control of humidity variations in the indoor air. These variations result in peaks in the indoor air humidity due to moisture production or in the exterior building envelope due to the diurnal va…
Aspects of the liquid-tin assisted directional solidification process that have the greatest impact on cooling conditions at the solidification front have been investigated. Thermal conditions within the mushy zone of the casting and outside the mold in the tin bath were characterized experimentally as a function of c…
Rotating bending fatigue test was carried out using AZ31 extruded magnesium alloy in order to clarify the S-N curve, crack initiation and propagation behavior of the alloy. The mechanisms of both crack initiation and crack arrest at the grain boundary during the fatigue process were investigated in detail with a speci…
A Polymer-Stabilized Cholesteric Liquid Crystal (PSCLC) is elaborated by combining the UV-curing with a thermally-induced pitch variation. We intend investigating possible memory effects into the characteristics of the reflection band of the PSCLC when the material comes back to the room temperature. Different thermal…
Polypyrrole (PPy) was synthesized by chemical oxidative polymerization of pyrrole in aqueous solution containing an oxidant, ferric sulfate, or potassium peroxydisulfate and an anionic surfactant, sodium bis(2-ethylhexyl) sulfosuccinate (AOT).The addition of AOT to the polymerization mixture leads to the incorporation…
The recent advent of several key behavioral issues in nuclear fuel performance, resulting from the trend toward increased fuel utilization, has created the need for enhanced steady state and transient fuel rod analysis capabilities. These issues, derived primarily from burnup-induced pellet changes and increased hydro…
Abstract The morphology of blends of two types of hydrogen-bonding systems was studied with a view to understanding the effect of blending on the extent of hydrogen bonding and changes in the morphology.One of them is the long-chain carbamate with a C 18 alkyl side chain, and the other is stearic acid, which also has…
Magnetoliposomes (ML′s) may be successfully applied for several purposes. A dimyristoylphosphatidyl‒choline‒based ML (ML‒2) sample was developed as a precursor of more complex thermal cancer therapy systems. The present study reports on morphology and magnetic resonance (MR) investigations carried out with the magneti…
We describe the electrosynthesis of a composite film consisting of polypyrrole and poly(1,5-diaminonaphthalene) (PPy-PDAN) on iron in neutral aqueous medium. The film structure was characterized by Raman and Fourier transform infrared spectroscopies. The composite film is composed first of layers of PDAN at the metal/…
Binary mixtures based on lactic acid derivatives were prepared and studied. Pure compounds differ in the type of linkage of the non-chiral chain to the molecular core, either keto or ether groups, and besides the SmA and SmC* phases they exhibit the antiferroelectric SmC A * or hexatic SmF(I)* phases, respectively. Ph…