Materials Literature
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Two series of hydrophobe-modified, ethoxylated urethane (HEUR) polymers were synthesized. The first series was prepared by the step-growth (S-G) polymerization of poly(oxyethylene) (POE) of M n = 6000, with a slight excess of different aliphatic diisocyanates in a 4.2 to 3.2 mole ratio to produce a S-G polymer with M…
Variations in the thermal heat treatments used during the fabrication of ZIRLO (Zr-1Nb-1Sn-0.1Fe) fuel clad tubing and in ZIRLO alloy chemistry were explored to develop a further understanding of the relationship between processing, microstructure, and cladding corrosion performance. Heat treatment variables included…
The review concentrates on the crystal structure results from several protein crystallography laboratories on three different lysozymes, the type-c lysozymes such as hen egg-white lysozyme (HEWL), the type-g lysozyme, such as goose egg-white lysozyme (GEWL), and the lysozyme from T4 bacteriophage (T4L). The crystallog…
The free-base, copper(II) and zinc(II) derivatives of 5,10,15,20-tetraarylporphyrin (aryl = phenyl, 4-methylphenyl or 4-chlorophenyl) and the corresponding brominated 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraarylporphyrin derivatives have been synthesized and their spectral and redox properties compared by UV/VIS…
The 1 H NMR spectra of a series of well-characterized μ-phenoxo and μ-alkoxo spin-coupled dicopper(II) complexes have been investigated. The complexes studied were [Cu 2 (BPMP)(OH)] 2+ ( 1 ) (BPMP = 2,6-bis[[bis(2-pyridylmethyl)amino]methyl]-4-methylphenol), [Cu 2 (CH 3 HXTA)(OH)] 2 - ( 2 ) (CH 3 HXTA = N, N ‘-(2-hydr…
Charge-transfer (CT)π complexes between tetrathiafulvalene (TTF, donor) and tetracyanoethylene (TCNE, acceptor) have been studied. Two polymorphs (α and β) were obtained depending on the solvent used. X-Ray analysis has shown that both polymorphs are monoclinic with space group P21/n, are present in dimeric form [(TTF…
Reaction of Cs2CO3 and As2Te3 in superheated methanol at 160 and 180 °C afford Cs2Te13 and Cs4Te28, respectively, whose anionic structures contain Te132– chains (Cs2Te13), Te62– chains and Ten rings (n= 4,8)(Cs4Te28) as building units.
A totally non-ionic pathway to mesoporous Ti-MSU-silicas is reported, wherein the incorporation of Ti into the silica framework proceeds via the hydrolysis of a chemically modified Ti-alkoxide species which permits control over the rate of hydrolysis of the metal precursor, thus allowing stoichiometric titanium incorp…
Zircaloy-4 cladding materials have been oxidized in a lithiated environment in autoclave and in out-of-pile loop tests. In such oxidation tests, a strong enhancement of the oxidation rate can occur depending on the water chemistry conditions and on the oxidation time. In this work, in order to improve our understandin…
Sulfated titania−silica gels have been obtained from tetraethoxysilane and titanium isopropoxide gelled either in acid medium (pH 3, HCl) or basic medium (pH 9, NH 4 OH). These gels were sulfated using sulfuric acid or ammonium sulfate. Three different methods have been used to study the acidity of these solids: forma…
Hysteresis measurements obtained on 0/90 SiC/CAS and SiC/SiC have been used to analyze the interface responses. Four parameters have been derived from these measurements. These relate to the compliance change caused by matrix cracking, the frictional resistance of the interface, the interface debond resistance, and th…
Lead sulfide thin films were grown at room temperature by the successive ionic layer adsorption and reaction (SILAR) technique on soda lime glass, ITO and Al2O3 covered glass, SiO2, (100)Si and (111)Si substrates. SILAR utilises sequential treatment of the substrate with aqueous precursor solutions. Dilute solutions o…
Abstract A novel methodology is proposed in this study to evaluate biofilm adhesion strength in two different ways: by measuring detached biomass caused by tensile force and by shear force. Tensile force was provided by centrifuging biofilm-attached plates installed on rotary tables. Shear force was provided by collid…
X-ray absorption spectroscopy at the L 2,3 edges of 3d transition metals has been used to study the electronic structure of molecular-based magnets with Curie temperatures ranging from 66 to 315 K. These magnets are bimetallic cyanides of the Prussian blue family, constructed by a three-dimensional assembling of −NC−C…
Three types of urethane−acrylate IPN's, two sequential and one simultaneous, were prepared in which the urethane was formed under thermal polymerization; and the acrylate, by photopolymerization. The IPN morphologies were studied by transmission electron microscopy (TEM) and dynamic mechanical analysis (DMA). When the…
The dinuclear Mn III complex [Mn 2 O(PhCOO) 2 (bpy) 2 (OH)(NO 3 )]·H 2 O was prepared by controlled oxidation of manganous nitrate with n -tetrabutylammonium permanganate in the presence of benzoic acid (PhCOOH) and 2,2‘-bipyridine (bpy). Its structure was determined in a single-crystal X-ray diffraction experiment, a…
Description This collection of work represents the tremendous progress that has recently been made toward the characterization and modeling of Titanium Matrix Composites (TMCs), including microstructural aspects, stress analysis, and life models. 29 papers divided into five sections cover: • Interfacial Properties and…
The synthesis of a new monoheteroporphyrin, 5,20-diphenyl-10,15-bis( p -tolyl)-21-selenaporphyrin (SeDPDTPH), is reported. The 21-selenaporphyrin has been characterized by 1 H NMR, 13 C NMR, mass spectrometry, and UV−visible spectra and an X-ray structural analysis. The free base selenaporphyrin SeDPDTPH crystallizes…
Charge transfer and recombination at the single crystalline ZnO photoanode were studied by a combination of dc and ac techniques. The potential dependence of the spectrally resolved photoluminescence gives information on the competition between bulk recombination and electron−hole pair separation. The kinetics of surf…
New methodology was developed for synthesis of regiochemically pure porphyrins with D 2 h symmetry (e.g. 9 ) via tetramerization reactions involving two different pyrroles. The two pyrrole components were a 2,5-diunsubstituted pyrrole (e.g. 11 ) and a 2,5-bis[( N,N- dimethylamino)methyl]pyrrole (e.g. 10 ), the latter…