Materials Literature
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Whatever the preferred representation of the frequency dependence of electrical relaxation experimental data, complex conductivity ${\ensuremath{\sigma}}^{*}(\ensuremath{\omega}),$ complex permittivity ${\ensuremath{\varepsilon}}^{*}(\ensuremath{\omega}),$ or complex electric modulus ${M}^{*}(\ensuremath{\omega}),$ th…
We applied the recently developed density-functional (DFT) formulation of the electron paramagnetic resonance (EPR) g-tensor to a series of axially symmetric d1 transition metal complexes (MEX4z−, where M=V, Cr, Mo, W, Tc, and Re; E=O and N; X=F, Cl, and Br). Values for the g-tensor components are determined by an int…
The surface loss probabilities of hydrocarbon radicals on the surface of amorphous hydrogenated carbon (C:H) films are investigated by depositing films inside a cavity with walls made from silicon substrates. This cavity is exposed to a discharge using different hydrocarbon source gases, and particles from the plasma…
We recently proposed a concentration fluctuation model to describe the segmental dynamics of miscible polymer blends [Kumar et al., J. Chem. Phys. 105, 3777 (1996)]. This model assumes the existence of a cooperative volume, similar to that in the Adam-Gibbs picture of the glass transition, over which segments have to…
The luminescence spectra and extended x-ray-absorption fine-structure (EXAFS) measurements of a series of ${\mathrm{Eu}}^{3+}$-based organic/inorganic xerogels were reported and related to the local coordination of the lanthanide cations. The hybrid matrix of these organically modified silicates, classed as $U(2000)$…
Continuous porous polymer monoliths that take on the shape of the reaction vessel are described. These materials are generated by polymerizing crosslinking monomers such as trimethylolpropane trimethacrylate (TRM, see Figure) in supercritical CO2. It is demonstrated that the pore size distribution can be fine-tuned wi…
A powder mixture of α‐Si 3 N 4 , Y 2 O 3 , and SiO 2 was heat‐treated in a loose powder state in the temperature range of 1750°–1900°C for 2 h; then, the mixture was acid‐rinsed to remove the glassy phase. The widths and lengths of the resulting β‐Si 3 N 4 crystals were analyzed quantitatively. The width–aspect‐ratio…
Abstract The purpose of the presented research was the investigation of the stability and differences of degradation of polyolefines during various recycling processes. In modeling the recycling process during melting, extrusion with a one‐screw extruder was used. Recycling through selective dissolution was modulated…
Two commercial Si 3 N 4 powders were coated with sintering aids by coprecipitation. Lanthanum and yttrium nitrates were used as sintering aid precursors. Electrokinetic sonic amplitude measurements and X‐ray photoemission spectroscopy analysis were used to investigate electrokinetic behavior and surface properties, re…
Experimental solubilities are reported at 25.0°C for biphenyl dissolved in 26 different alkane, dialkyl ether, and alcohol solvents. Results of these measurements, combined with previously published biphenyl solubility data, are used to test the applications and limitations of expressions derived from Mobile Order the…
The bulk amorphous-like (a-) semiconductor, a-ZnIn2Te4, is prepared by the melt-quench technique. The pseudodielectric-function spectra, 〈ε(E)〉=〈ε1(E)〉+i〈ε2(E)〉, of a-ZnIn2Te4 are measured by spectroscopic ellipsometry in the 1.2–5.3 eV photon-energy range at room temperature. The measured 〈ε(E)〉 spectra strongly rese…
Abstract Poly(3‐hydroxybutyrate) (PHB) and ist 3‐hydroxyvalerate containing copolymers form a family of fully biodegradable polyesters with many potential applications. In this work, the results obtained in our laboratory concerning carbon dioxide, water and organic solvent transport through PHB and three low 3‐hydrox…
The formation of ettringite (3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O) from monosulfate (3CaO·Al 2 O 3 ·CaSO 4 ·12H 2 O) and gypsum (CaSO 4 ·2H 2 O) was investigated by isothermal calorimetry and X‐ray diffraction (XRD) analyses. Hydration was carried out at constant temperatures from 30° to 80°C using deionized water and 0.2…
A combined electrochemical quartz crystal microbalance (EQCM) and probe beam deflection (PBD) instrument was used to monitor the mobile species transfers at the first and second redox steps of thin (Γ ≅ 5 × 10 -8 mol cm -2 ) poly( o -toluidine) films exposed to either 0.01, 0.1, or 1.0 mol dm -3 HClO 4 aqueous electro…
Potassium or chromium were evaporated by means of a Knudsen effusion cell under ultra-high vacuum conditions onto a number of common polymers, prepared as stretched foils and spin-coated films. The metal-polymer interface was studied by X-ray Absorption and X-ray Photoelectron Spectroscopy. Evaporated samples were ana…
Raman spectroscopy has been used to characterise the structure of three very different particulate composite systems: aramid particles in nylon 6.6, cast iron (graphite particles in an iron matrix) and C60 or carbon nanotubes in an epoxy resin matrix. In addition, Raman spectroscopy has been used to follow the stress-…
The effects of thermal exposure on the strengths of Nextel™ 550 and 720 tows, bare and coated with carbon, were determined by room‐temperature tensile testing of single filaments extracted from tows that had been exposed to different thermal environments (i.e., air or vacuum) at temperatures from 550° to 1400°C. The r…
In the present paper, a computational model is used to simulate the aero-dynamic, thermal, and chemical conditions inside an arch-fired coal boiler. The model is based on the Eulerian-Eulerian concept, in which Eulerian conservation equations are solved both for the gas and the particulate phases. A NOx formation and…
Structure development in silica filled polyisoprene composites was investigated by wide line pulsed NMR and high-resolution solid-state NMR combined with transmission electron microscopy. The rubber phase in the composites was composed of so-called bound rubber and free rubber. Furthermore, the bound rubber was compos…
Abstract Vegetable oils are often thermally polymerized to provide a vehicle for printing inks and paints. The formations of isomerization, and the intra‐ and intermolecular bonds involved in the thermal process are crucial in designing a product with the appropriate characteristics. It was found, with a differential…