Materials Literature
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Oxygen permeability data, vital parameters for understanding and modeling the thermooxidative degradation of polymers, have been determined for various elastomers. Using a novel experimental setup, oxygen permeability through sheet materials was measured for elevated temperatures up to 225 °C. Under these conditions o…
Short, natural fibers belonging to the species Hildegardia populifolia were reinforced in styrenated polyester matrix. The mechanical properties of these polymer composites such as tensile modulus, compression strength at first deformation, flexural modulus, and izod impact strength were determined. The effect of alka…
An amphiphilic ABA triblock copolymer was synthesized using poly(2-ethyl-2-oxazoline) (PEtOz) as hydrophilic block [A] and poly(dimethylsiloxane) (PDMS) as hydrophobic block [B]. The cationic ring-opening polymerization of 2-ethyl-2-oxazoline was initiated by benzyl chloride in the presence of NaI. PEtOz–PDMS–PEtOz wa…
A technique is described that allows the staining and subsequent visualization of polymers that contain the phosphorylcholine (PC) group. These materials are useful as bulk materials or coatings for the fabrication of medical devices. The staining method employs rhodamine 6G, which can be simply and rapidly applied to…
New hybrid solid-state dye laser materials based on highly porous silica aerogels have been synthesized. The open porous network of the aerogel was saturated with laser dyes dissolved in appropriate organic monomers, and polymerization took place inside the silica structure. The resulting polymer-filled nanoporous aer…
A thermodynamic theory is used to determine the effective pyroelectric coefficients of polarization graded ferroelectrics, with values in excess of 0.1μC∕cm2°C are predicted for various barium strontium titanate thin films. Maximum values closer to 0.4μC∕cm2°C are obtained for a 1μm thick material—compositionally grad…
Intrinsic evolution in evolvable hardware research has hitherto been limited to using standard electronic components as the media for problem solving. However, recently it has been argued that because such components are human designed and intentionally has predictable responses; they may not be the optimal medium to…
The decomposition of methoxide (CH(3)O) on a PdZn alloy is considered to be the rate-limiting step of steam re-forming of methanol over a Pd/ZnO catalyst. Our previous density functional (DF) studies (Langmuir 2004, 20, 8068; Phys. Chem. Chem. Phys. 2004, 6, 4499) revealed only a very low propensity of defect-free fla…
Porous and amphiphilic polymer microspheres were incorporated into polyurea capsules in order to control the release of the core solvents independently of wall formation. While nonpolar poly(divinylbenzene-55) microspheres were simply encapsulated along with the xylene core solvent, the amphiphilic poly(divinylbenzene…
Fluidized fractal clusters of fine particles display critical-like dynamics at the jamming transition, characterized by a power law relating consolidation stress with volume fraction increment [${\stackrel{^}{\ensuremath{\sigma}}}_{c}\ensuremath{\propto}(\ensuremath{\Delta}\ensuremath{\phi}{)}^{\ensuremath{\beta}}$].…
Double-walled carbon nanotubes (DWCNTs) were synthesized by chemical vapour deposition using Fe–Mo catalyst supported on magnesium oxide particles. A mixture of gases of methane and hydrogen was used for the growth. The effect of gas pressure, ratio of methane to hydrogen, and growth temperature on the structure, puri…
The synthesis of PbFeO 2 F is achieved using a solid-state reaction under high pressure. This perovskite crystallizes in SG Pm 3̄ m (No. 221) with a = 0.39991 (1) nm. The Rietveld refinement using powder X-ray diffraction data shows that the mean structure of this compound can be characterized as follows: (1) the Pb i…
Polychromatic X-ray microdiffraction is an emerging tool for studying mesoscale structure and dynamics. Crystalline phase, orientation (texture), elastic and plastic strain can be nondestructively mapped in three dimensions with good spatial and angular resolution. Local crystallographic orientation can be determined…
An analytical technique that can be effectively used for the calculation of the end-winding leakage inductance of a turbogenerator has been presented. It is based on a three-dimensional geometric model of the end-winding region in which each coil is modeled as a set of serially connected straight filaments. The calcul…
A completely soluble polyaniline-multi-wall carbon nanotube (CNT-PANI) composite with drastically enhanced conductivity, improved thermal stability, and luminescent behaviour, has been synthesized. The presence of straight multi-wall carbon nanotubes during the polymerization of aniline induces the formation of a more…
Atomic cations (26), M+, have been shown to lie within a thermodynamic window for O-atom transport catalysis of the reduction of N2O by CO and have been checked for catalytic activity at room temperature with kinetic measurements using an inductively-coupled plasma/selected-ion flow tube (ICP/SIFT) tandem mass spectro…
Preparation and characterization of europium(III), terbium(III), samarium(III), and dysprosium(III) polystyrene nanoparticle labels with lanthanide-specific fluorescence properties has been presented. Emulsion copolymerization of styrene and acrylic acid was used to synthesize uniform-sized nanoparticles approximately…
BACKGROUND: Magnetic fluid hyperthermia (MFH) is a new technique for interstitial hyperthermia or thermoablation based on AC magnetic field-induced excitation of biocompatible superparamagnetic nanoparticles. Preliminary studies in the Dunning tumor model of prostate cancer have demonstrated the feasibility of MFH in…
We report the characterization of strain components in transistor structures with silicon–germanium (Si0.75Ge0.25) and silicon–carbon (Si0.99C0.01) stressors grown by selective epitaxy in the source and drain regions. The spacing between the source and drain stressors is 35nm. Lattice strain analysis was performed usi…
Phase formation of surface alloying by spinodal decomposition has been studied at an electrified interface. For this aim Zn was electrodeposited on Au(111) from the ionic liquid AlCl(3)-MBIC (58:42) containing 1 mM Zn(II) at different potentials in the underpotential range corresponding to submonolayer up to monolayer…