Materials Literature
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Abstract The solubility of butane and isobutane in molten polypropylene (PP) and polystyrene (PS) was measured at pressures up to 3 MPa and along four isotherms from 438 to 483 K for PP and from 348 to 473 K for PS. The solubility increased with increasing pressure and decreasing temperature. At 438 K and 2 MPa, the s…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract New nanocomposites based on a vinylester resin (VER) and the organo‐montmorillonites (ODA‐M, BHL‐M, DEM‐M, BHLV‐M) modified with octadecylammonium, bis(2‐hydroxyethyl)lauryl ammonium, diethyl[2‐(methacryloyloxyl)ethyl]ammonium, and bis(2‐hydroxyethyl)lauryl(vinylbenzyl)‐ammonium chlorides, respectively, were…
Neutron powder diffraction (NPD), ac susceptibility and electron magnetic resonance (EMR) techniques were employed for studying the crystallographic structure and magnetic ordering in $\mathrm{Ca}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(x\ensuremath{\leqslant}0.40)$ manganite system. It is…
Based on the Kubo formalism, electronic transport in macroscopic quasiperiodic systems is studied by means of an efficient renormalization method, and the convolution technique is used in the analysis of two- and three-dimensional lattices. For the bond problem, we found a transparent state located at a center of self…
One of the key criteria in measuring the effectiveness of position sensitive detectors (PSDs) is that of sensitivity—how large an electrical signal can be produced for a given change in the incident light position. The larger the signal produced, then the less additional electronics for amplification required. In this…
The effect of the pretreatment on the interaction between NO and Au−TiO 2 was examined using DRIFTS as a monitoring tool. For calcined and reduced Au−TiO 2, adsorption of NO on the TiO 2 support is not promoted under the conditions employed. Au(NO) 2 is the predominant species on oxidized and reduced Au−TiO 2 with ini…
We combine classical and quantum-mechanical simulations to study the structural changes in $\mathrm{Ca}\mathrm{Ti}{\mathrm{O}}_{3}$ under irradiation. We identify common defects, and suggest that their stability is related to the covalent character of Ti-O bonding. We address the issue of resistance to amorphization b…
We present photoconductivity and Raman scattering data obtained from composite films of poly(paraphenylene vinylene) (PPV) and single-walled carbon nanotubes at different weight concentrations from 0% to 64%. It is found that the introduction of nanotubes in the PPV precursor polymer solution, heated at $300\ifmmode^\…
We report a high-pressure Raman scattering investigation of $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ $(\mathrm{PMN}\text{\ensuremath{-}}{\mathrm{PT}}_{x})$, which is considered as a prototype relaxor-based piezoe…
We present new and refined data for the magnetic field $(H)$ and temperature $(T)$ dependence of the proton spin-lattice relaxation rate $(1∕{T}_{1})$ in antiferromagnetic molecular rings as well as a new explicit scaling formula that accurately reproduces our data. The key ingredients of our formulation are (1) a red…
Optical spectroscopy and x-ray diffraction were used to study the behavior of polycrystalline samples of pure monoclinic zirconia irradiated by low energy ions. A microscopic model based on these experiments is proposed to explain the displacive phase transition observed in this material after irradiation. Defects, pr…
Thin Nd-Fe-B films have been prepared by pulsed laser deposition on sapphire substrates. A Ta buffer layer has been used to promote epitaxial growth. The deposition temperature has been varied between 400 \ifmmode^\circ\else\textdegree\fi{}C and 700 \ifmmode^\circ\else\textdegree\fi{}C and proved to be an important pa…
Abstract Polyamide 6 (PA6)/organo‐montmorillonite nanocomposites prepared by melt compounding using a co‐rotating twin‐screw extruder were intercalated nanocomposites. The modulus, bending strength and heat distortion temperature of these nanocomposites increased with increasing clay content, and tensile strength incr…
The B3LYP density functional method has been validated for the di-Mn-substituted gamma-Keggin polyoxometalate (POM) anion, [(SiO4)MnIII2(OH)2W10O32]4-, and for the divacant lacunary silicodecatungastate, gamma-[(SiO4)W10O32]8-. This approach was shown to adequately describe the geometries of [(SiO4)MnIII2(OH)2W10O32]4…
Abstract The boundary element method (BEM) was used to study galvanic corrosion using linear and logarithmic boundary conditions. The linear boundary condition was implemented by using the linear approach and the piecewise linear approach. The logarithmic boundary condition was implemented by the piecewise linear appr…
A certain number of reactions in the organic synthesis pose serious scale-up problems; on the other hand, other reactions create safety issues that must be addressed early during process development. The following work shows a statistical analysis of different reactions in terms of kinetics and phases (solid−liquid−ga…
Communication to the Editor - No abstract
Polycrystalline samples of the modified Pb(Zr 1− x Ti x )O 3 (PZT) composition, with representative formula Pb 0.92 (La z Bi 1− z ) 0.08 (Zr 0.65 Ti 0.35 ) 0.98 O 3 (PLBZT), a family of relaxor ferroelectrics, were prepared via the chemical route with z = 0.3, 0.6 and 0.9. Crystalline phases of powders calcined at dif…
Abstract For Abstract see ChemInform Abstract in Full Text.