Materials Literature
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The thermoluminescent properties of crystalline strontium tetraborate are reported. Without activators it has an efficiency comparable to that of TLD-700 powders. Its fading after 40 days amounts to less than 2%. The isometric plot shows that most of the emitted light is concentrated at wavelengths ranging from 350 to…
We consider the class of borate additives in an attempt to understand, on the basis of molecular modelling techniques, why they are effective high temperature cement setting retarder aids. Borates are known to act as cement retarders under ambient conditions, for which the Billingham-Coveney clock reaction scheme [1]…
Novel one-pot syntheses of sulfur-containing polymers from a bifunctional five-membered cyclic dithiocarbonate (1a) were carried out. Polythiourethanes were obtained by the polyaddition of 4,4′-methylenebis(phenyl isocyanate), tolylene 2,6-diisocyanate, and hexamethylene diisocyanate with a dithiol (2a) obtained by th…
The high‐frequency viscoelastic behavior of a soda‐lime‐silica glass has been investigated using the Brillouin scattering technique. The temperature dependence of instantaneous elastic constants and very short‐time relaxation mechanisms have been measured in a temperature range between 100° and 1000°C. Variations in t…
P -type transparent conducting oxide films consisting of a new multicomponent oxide composed of In2O3 and Ag2O have been prepared by rf magnetron sputtering. After postannealing at a temperature of 500 °C in air, In2O3–Ag2O thin films prepared using In2O3–Ag2O targets with Ag2O contents of 40–60 wt % exhibited p-type…
The behavior of propagating shear waves in a supercooled liquid is analyzed, taking into account the proper structural effects at high density. The longest wavelength for the propagating shear waves that the undercooled liquid can sustain grows with density. This length scale, which is linked to a characteristic solid…
Our aim in this article is to study the existence of finite dimensional attractors for a class of generalized Cahn–Hilliard equations based on a microforce balance introduced by M. Gurtin (Physica D 92 (1996), 178–192). We first consider some general results on the existence of finite dimensional attractors, and then…
Gelcasting is an advanced powder forming process. It is most commonly used to form ceramic or metal powders into complex, near-net shapes. Turbine rotors, gears, nozzles, and crucibles have been successfully gelcast in silicon nitride, alumina, nickel-based superalloy, and several steels. Gelcasting can also be used t…
Abstract The mechanical properties and morphology of melt mixed polystyrene (PS)/polyethylene (PE) blends that were modified by the addition of up to 16% of a semicrystalline PS‐b‐hPB (hydrogenated polybutadiene) diblock copolymer with varying molecular weight are reported. As a result of the blocks of the copolymer p…
Polyetherimide is a versatile polymer with interesting thermal properties (Tg above 200°C) that is already used in electrical engineering. It is of interest to investigate its electrical charge storage and decay processes, both to predict the degradation occurring under electrical load, but also for the purpose of usi…
The crystallization of calcium oxalate monohydrate (COM) was investigated at conditions of constant supersaturation both in the absence and in the presence of synthetic maleic acid copolymers at 37C, 0.15 M NaCl. The dependence of the rates of COM crystallization in the absence of inhibitors was found to be second ord…
The influence of charge on diffusion in porous media was studied for fluorescent colloidal silica spheres diffusing in a porous glass medium. The bicontinuous porous silica glasses were optically matched with an organic solvent mixture in which both glass and tracers are negatively charged. Using fluorescence recovery…
Elastic electron scattering in XPS and AES vary considerably with depth of origin of emitted electrons. To account for this, we introduced in a recent paper a simple correction factor CF. The function CF is the ratio of emitted peak intensity from a layer of atoms located at a given depth in a solid calculated from th…
Ion-beam bombardment was developed as a substitute for mechanical rubbing of polyimide film as a noncontact liquid crystal (LC) alignment technique. The ion-beam technique was applied to a high-resolution thin-film-transistor-addressed liquid crystal display (TFT/LCD) panel. The results showed that LC alignment was ac…
A series of new soluble polyamides having isopropylidene- and methyl-substituted arylene ether moieties in the polymer chain were prepared by the direct polycondensation of 3,3′,5,5′-tetramethyl-2,2-bis[4-(4-aminophenoxy)phenyl]propane (TBAPP) and various aromatic dicarboxylic acids in N-methyl-2-pyrrolidinone (NMP) u…
Alumina continues to play an important role in the materials industry with the Bayer process still providing alumina after a 100 years of continuous processing. In addition to traditional applications of alumina, alumina is being advanced as a major part of the new frontier on nanophase materials and nanophase technol…
A theoretical study of the SiC 3 + isomers has been carried out, characterizing six different structures. Predictions for their geometries and vibrational frequencies have been made at both the MP2/6-31G* and B3LYP/cc-pVTZ levels. The nature of bonding in these isomers has been characterized by using Bader's topologic…
The structural inhomogeneities in a weakly charged gel consisting of ( N -isopropylacrylamide- co -acrylic acid) (NIPA−AAc) have been investigated by small-angle neutron scattering (SANS) as a function of cross-linking density (CD) and temperature. The CD and temperature dependence of the scattered intensity profiles,…
Three species of the marine planktonic diatom genus Corethron are recognized, and compared in detail using light and electron microscopy. The confusion in the use of some of the names given to taxa in the past is clarified, mainly based on differences in the morphology of the hooked spines. The commonly used combinati…
Films of poly(vinyl alcohol), ∽2 nm thick, on silicon, copper and gold substrates were allowed to degrade for up to 800 min during monochromatized Al Kα XPS. Relative initial degradation rates of 1:∽33:∽41 were measured for the three substrates, consistent with their yield of photoelectrons and secondary electrons. Th…