Materials Literature
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The mixed valence cluster anion of the compound (NH4)32[MoVI110MoV28O416H6(H2O)58(CH3CO2)6].xH2O 1 (x approximately 250), synthesized under one-pot conditions, contains well-defined different types of defects--missing groups compared to the complete parent (Mo154) type cluster with full D7d symmetry--and acetate ligan…
This article deals with the structure, crystallization, morphology, and thermal behavior of poly(p-phenylene sulfide) (PPS) with low-molecular mass, probed by DSC, optical, and electron microscopy. The growth rates of spherulites were measured over the temperature range 235–275°C. A regime II–III transition was found…
Nanoparticles of chromium or nickel have been prepared by the reduction of either CrCl2 or Ni(acac)2 (acac = pentane-2,4-dionate) at elevated temperatures in various Lewis base solvents; the effect of the Lewis base, which acts as both a reaction solvent and passivating ligand on morphology are apparent; the nanostruc…
A microstructure function, G(x), is introduced as a general description of microstructure by considering simultaneously the spatial arrangement of phases, i(x), of crystallographic orientations, g(x), as well as of lattice defects and residual stress, D(x). Particular emphasis is laid on the orientation–location distr…
A simple, approximate analysis of the effect of different cathode and anode areas on the measurement of cell performance on anode-supported solid oxide fuel cells, wherein the cathode area is smaller than the anode area, is presented. It is shown that the effect of cathode area on cathode polarization, on electrolyte…
Copper is widely accepted as a next-generation metallization material for ultralarge-scale integration (ULSI) because of its low resistivity and high electromigration resistance. It is well known that Cu oxidizes easily at low temperatures. This characteristic has impeded the application of Cu in integrated circuits.…
Fe-Cr model alloys with variations in chromium content and additions of different reactive elements were studied for potential application in reduced temperature solid oxide fuel cells (SOFC). The oxidation resistance in both, anode and cathode atmospheres at 800°C were determined. Additionally, in-situ studies were c…
Aliphatic polyesters derived from lactic and glycolic acids (PLAGA) are the most attractive degradable polymers with respect to biomedical and environmental applications. Poly(e-caprolactone), PCL, is a hydrophobic highly crystalline aliphatic polyester that is more resistant to hydrolytic degradation than PLA. It is…
Ground tire rubber (GRT) and ultrasonically devulcanized GRT (DGRT) were blended with high density polyethylene (HDPE) in a Brabender internal mixer and a twin screw extruder. The DGRT with curatives was mixed with HDPE (HDPE/RGRT) and dynamically revulcanized in an internal mixer and a twin screw extruder. Also, HDPE…
Mammalian cochlea perilymph contains amino acids and protein which have a major effect on the electrochemistry of an implanted auditory prosthesis. Cyclic voltammetry in an artificial perilymph solution shows that many amino acids adsorb at the platinum electrode diminishing oxidation of the metal, and also blocking h…
A novel method based on the solid–liquid reaction in the Ti–Sn–C system was developed for the synthesis of Ti2SnC powders. In this process, Ti–Sn intermetallic compounds were formed in liquid Sn, then they further reacted with graphite powders to form Ti2SnC. The advantages of this solid–liquid reaction based method i…
As power lines are built in contaminated environments, the industrial usage of power-line materials requires high reliability. Nonceramic insulators offer better anticontamination performance than that of the traditional ceramic insulators. Among the nonceramic materials, EPDM and silicone rubber provide much better l…
Mechanics of textile fabrics by modelling of equilibrium of forces is difficult to apply broadly in practical applications. An alternative, which offers more promise for industrial utility in computer-aided design, is the energy-based approach described by Hearle and Shanahan (1978 a, b). The paper reviews the basic p…
We present a full characterization of the anhydrous layered material K2SrTa2O7 related to Ruddesden–Popper type phases. The unit cell, determined from powder X-ray diffraction, is tetragonal with a = 3.9858(1) Å and c = 21.785(1) Å (space group I4/mmm, Z = 2). The layered structure allows spontaneous water intercalati…
An intensely sweet polyoxypregnane glycoside, telosmoside A15 (15), was isolated from an Asian Asclepiadaceae plant, Telosma procumbens, collected in Vietnam. This is the first time a sweet pregnane glycoside has been found, and its sweetness intensity is 1000 times greater than that of sucrose. From the same plant, 1…
Protection of Iron Against Corrosion Using a Polyaniline Layer: II. Spectroscopic Analysis of the Layer Grown in Phosphoric/Metanilic Solution , Bernard, Marie Claude, Joiret, Suzanne, Hugot-Le Goff, Anne, Long, Pham Duy
Biodegradable microspheres were prepared with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV, 85:15 by mole ratio of hydroxybutyrate to hydroxyvalerate) by an water-in-oil-in-water (W/O/W), oil-in-water (O/W) and oil-in-oil (O/O) solvent evaporation method for the sustained release of anti-cancer drug, 5-fluoroura…
Changes produced after hydrothermal treatments at 400 °C and at different pressures in a set of Lu-saturated smectites have been compared with those occurring in a mixture of 2SiO 2 :1Lu 2 O 3 . The effect of the mineralogical composition of the smectite on the reactivity has been analyzed. The growth of a new crystal…
Large numbers of identical and stable SE(R)RS [surface-enhanced (resonance) Raman]-active media, which are convenient to handle and manipulate but sufficiently inexpensive that they can be used once and then discarded, have been prepared by isolating nanoparticles from Ag and Au sols in hydrophilic polymer gels. The p…
Polycrystalline diamond films and diamond powders, treated with elementary fluorine, chlorine trifluoride or anhydrous hydrogen fluoride under various conditions, have been examined using spectroscopic and microscopy techniques. Formation of C–F bonds occurs when F2 or ClF3 are used, the surface groups present being t…