Materials Literature
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We report a simple method for preparing polycrystalline ZnO thin films with good luminescent properties: the oxidization of metallic Zn films. In photoluminescence (PL) studies at room temperature for wavelengths between 370 and 675 nm, we have observed a single exciton peak around 390 nm without any deep-level emissi…
The magnetic phase diagrams of four ${L}_{1\ensuremath{-}x}{A}_{x}{\mathrm{MnO}}_{3}$ series $(L=\mathrm{P}\mathrm{r},\mathrm{S}\mathrm{m};$ $A=\mathrm{C}\mathrm{a},\mathrm{S}\mathrm{r})$ have been established combining neutron diffraction, electron microscopy, and magnetotransport measurements in order to understand…
We report the realization of p-type behavior in ZnO thin films, which are prepared by codoping method using Ga (donor) and N (acceptor) as the dopants. Especially, using active N formed by passing N 2 O gas through an electron cyclotron resonance (ECR) plasma source is quite effective for the acceptor doping. We have…
▪ Abstract About two-thirds of primary energy today is used directly as transportation and heating fuels. Any discussion of energy-related issues, such as air pollution, global climate change, and energy supply security, raises the issue of future use of alternative fuels. Hydrogen offers large potential benefits in t…
We show that the anomalous Hall effect (AHE) observed in colossal magnetoresistance manganites is a manifestation of Berry phase effects caused by carrier hopping in a nontrivial spin background. We determine the magnitude and temperature dependence of the Berry phase contribution to the AHE, finding that it increases…
Nanocrystalline metals, i.e., metals in which the grain size is in the nanometer range, have a range of technologically interesting properties including increased hardness and yield strength. We present atomic-scale simulations of the plastic behavior of nanocrystalline copper. The simulations show that the main defor…
This paper reports interactions and possible incompatibilities in solid dispersions of hydrophobic drugs with hydrophilic carriers, with solubility parameters employed as a means of interpreting results. Systems containing ibuprofen (IB) and xylitol (XYL) in varying proportions and systems of IB with other sugars and…
Superhydrophobic surfaces are those with a water contact angle greater than 150°, and these are desired for various industrial products. Such surfaces have been achieved for boehmite and silica films, which were roughened by the sublimation of aluminum acetylacetonate during calcination. The Figure shows the shape of…
Diatoms are the most species-rich group of algae. They are ecologically widespread and have global significance in the carbon and silicon cycles, and are used increasingly in ecological monitoring, paleoecological reconstruction, and stratigraphic correlation. Despite this, the species taxonomy of diatoms is messy and…
The dependence of polyelectrolyte multilayer thickness on salt concentration, salt type, solvent quality, deposition time, and polymer concentration is evaluated. Polymers are deposited on spinning silicon wafers. For the strong polycation/polyanion pair studied, film thickness is approximately proportional to the num…
Methods of synthesis, molecular and electronic structures and electrophysical, optical and magnetic properties of ternary and quaternary chalcogenides based on copper, silver and gold are considered. The possibility of the synthesis of chalcogenide analogues of high-temperature superconductors is discussed. The prospe…
The influences of the type and concentration of α-olefin (1-hexene, 1-octene, 1-decene, 1-octadecene, 4-methyl-1-pentene) on the mechanical behavior and crystallinity degree of some ethylene/α-olefin copolymers obtained by metallocene catalysts were studied by means of stress/strain experiments. The crystallinity degr…
The dynamic mechanical properties of rubber vulcanisates filled with cryogenically pulverized polyurethane foam particles, used as a reinforcing filler, were investigated with respect to storage modulus (E′), loss modulus, and the variation of glass transition temperature. Two rubbers were using styrene–butadiene rubb…
Calcium carbonate highly filled composites of a polyolefin plastomer (POP), and its blends with postconsumer linear low-density or high-density polyethylene (PC-LLDPE or PC-HDPE) were prepared and evaluated. The mechanical properties of compounded POP and its blends were compared with those of a PVC–calcium carbonate…
The effect of water on the morphology of four ethylene vinyl alcohol copolymers (EVOH) with different ethylene contents was studied by differential scanning calorimetry (DSC). EVOH film samples equilibrated in controlled atmospheres at different relative humidities (RH) and 23°C were analyzed. Under dry conditions, th…
The thermal, viscoelastic, and mechanical behaviors of three binary blends of ethylene 1-octene copolymer (EOC) regarding the melt index and density, one component made by Ziegler–Natta (FA and RF in abbreviation of the commercial name) and the other by metallocene catalysts (FM, EN and PL in abbreviation of the comme…
The numerical simulation of concrete subjected to high dynamic loadings, e.g. explosive charges, is a subject of current research. This kind of loading produces extremely high pressures in the megabar region and strain rates up to 108(1/s). It is obvious that one will not succeed by only using the classical field of s…
We derive the modified Young's equation for the contact angle of a fluid droplet on a rigid substrate using an interface displacement model and identify the line tension with the excess free energy per unit length calculated previously for a straight three-phase contact line.
The electrochemistry of a chemically prepared polypyrrole/poly(styrene-4-sulfonate) powder has been investigated by cyclic voltammetry and impedance spectroscopy in a variety of aqueous electrolytes. The facile p-doping/undoping of thick layers of the polymer composite is shown to be due to the high ionic conductivity…
Anionic ring-opening polymerization of ε-thionocaprolactone was examined. When organolithiums, Grignard reagents, and lithium tert -butoxide were used as the initiators, the corresponding polythiocarboxylic- O -ester was selectively formed. When potassium tert -butoxide and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) wer…