Materials Literature
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Abstract Addition of Ammonium Polyphosphate/Polyamide‐6 system is known to provide flame retardancy in many polymers blends via an intumescent process. Particulate fillers (talc and calcium carbonate) are used in large quantities in PP. Combination of fillers in PP can modify the properties of the polymeric matrix. Th…
Abstract Copolymers of 2‐methylene‐1,3‐dioxepane (MDO) and methyl acrylate (MA) containing ester units both in the backbone and as pendant groups were synthesized by free‐radical copolymerization. The influence of reaction conditions such as the polymerization time, temperature, initiator concentration, and comonomer…
The optical spectra of single crystals of hexagonal rare-earth manganites RMnO3 (R=Sc, Y, Er) are studied in the range from 0.7 to 5.4 eV. It is found that the spectra substantially differ from the spectra of orthorhombic manganites in both the positions of spectral features and their polarization anisotropy. It is sh…
Abstract Barrier‐type anodic films 3–15 nm thick have been formed on electropolished 99.999% aluminium. Variable‐angle XPS has been used to identify a significant proportion of hydroxyl ions at the surface of the relatively compact alumina films. The location of an oxygen‐rich region at the outer surface of the oxide…
This mini-account describes our recent effort to exploit dendritic phthalocyanines, focusing on their photophysical properties and aggregation behavior in water and in microheterogeneous media. Two series of dendritic phthalocyanines have been prepared. The ones with terminal ester functionalities are non-aggregated i…
Abstract The influence of NaCl and CO 2 on the atmospheric corrosion of magnesium alloy AZ91 is studied in the laboratory. Samples were exposed under carefully controlled air and flow conditions; the relative humidity was 95%, the temperature was 22.0°C and the concentration of CO 2 was < 1 ppm or 350 ppm. Differen…
Using reverse non-equilibrium molecular dynamics simulations, we report the calculation of the shear viscosity and the tracer diffusion coefficient of a binary Lennard-Jones mixture that is known as a model glass-former. Several remarkable temperatures are well reproduced in our calculations, i.e. T S (the onset of sl…
Red thin-film phosphors were fabricated based on a ZnO:(La,Eu)OF nanocomposite structure where (La,Eu)OF nanoparticles were dispersed in a ZnO film matrix. The films were deposited on glass substrates by a sol-gel method at a low temperature of 600 °C using trifluoroacetic acid as a fluorine source. Doping gallium int…
ZnO nano-rods were grown on polycrystalline Zn foil by cathodic electrodeposition in an aqueous zinc chloride/calcium chloride solution at 80°C. Variations in the solution concentration and substrate surface preparation were explored to shed light on the nucleation of the nano-rods. It was found that the nano-rod diam…
A new mathematical model describing a plain knitted fabric is proposed in this paper. One major feature of this model is that the yarn in the fabric can be naturally curved with nonlinear mechanical properties. The new model is able to describe the dimensions and also the low stress mechanical properties of a plain kn…
NmrA, a transcription repressor involved in the regulation of nitrogen metabolism in Aspergillus nidulans,is a member of the short-chain dehydrogenase reductase superfamily. Isothermal titration calorimetry and differential scanning calorimetry have been used to show NmrA binds NAD+ and NADP+ with similar affinity (av…
The effect of mechanical stimulation on the development of tissue-engineered blood vessels was examined. In particular, three different rates of radial distension were chosen to produce a nonpulsed environment (0 beats per minute [bpm]), an adult heart rate (90 bpm), and a fetal heart rate (165 bpm). Engineered vessel…
Hemp (Cannabis Sativ L.) is an important lignocellulosic raw material for the manufacture of cost-effective environmentally friendly composite materials. From an earlier study it was found that when hemp bast fibers were heated above the glass transition temperature of lignin, there was a migration of lignin to the su…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXT"Plug and Play" Polymers. Thermal and X-ray Characterizations of Noncovalently Grafted Polyhedral Oligomeric Silsesquioxane (POSS)−Polystyrene NanocompositesJoseph B. Carroll, Alan J. Waddon, Hiroshi Nakade, and Vincent M. RotelloVi…
A phase-field model was developed for predicting the domain structure evolution in a thin film with an arbitrary distribution of dislocations and subject to a substrate constraint. The effect of interfacial dislocations on the formation of tetragonal ferroelectric domains in a cubic paraelectric matrix was studied. It…
Microstructural characterization of boron‐containing SiC‐reinforced SiC composites exposed at high temperature in high‐water‐vapor‐pressure environments was used to determine surface recession rates and to understand the controlling degradation processes under these conditions. Results showed that composite degradatio…
Three Si 3 N 4 materials were exposed to dry oxygen flowing at 0.44 cm/s at temperatures between 1200° and 1400°C. Weight change was measured using a continuously recording microbalance. Parabolic kinetics were observed. When the same materials were exposed to a 50% H 2 O–50% O 2 gas mixture flowing at 4.4 cm/s, all t…
Peak profile analysis based on high-resolution X-ray diffractometry and transmission electron microscopy (TEM) were used to measure the distribution of grain sizes, the dislocation density, and the corresponding root mean square strain in ultrafine-grained (UFG) nickel processed by different methods: electrodeposition…
We have fabricated electrodes for a supercapacitor using fluorinated single-walled carbon nanotubes (SWCNTs). Although the specific surface areas of the pristine and fluorinated SWCNTs are similar, the electrochemical reactions are different significantly from each other. The specific capacitance of the fluorinated SW…
Poly( l -lysine) (PLL) was end-grafted onto silicon oxide surfaces to study its conformational transition among α-helix, β-sheet, and random coil at the solid−water interface. Surface-grafted PLL films were prepared from surface-grafted poly( N ε -carbobenzyloxy- l -lysine) (PCBL) thin films, which were fabricated by…