Materials Literature
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Often for slurries, gels, emulsions, and foams inhomogeneous fluid properties at solid boundaries create “apparent wall slip.” The reduced fluid viscosity at the boundary creates a thin layer of fluid having a large velocity gradient that can be treated as a “slipping layer”. In measurements of fluid viscosity it is n…
Abstract An ambient pressure superconductivity of (BEDT-TTF)2Cu(SCN)2 was observed by d.c. magnetic susceptibility and electrical conductivity measurements. The superconducting critical temperature is the highest (TC=10.4 K) among the organic superconductors so far obtained, even though the anion has a positional diso…
Metal oxides, in the form of dispersed powders, have been tested as potential catalysts for the four-electron oxidation of water to O2 under photochemical conditions. The most efficient catalysts were found to be IrO2, Co3O4, RuO2, NiCo2O4, Rh2O3 and Mn2O3 and, in particular, high activity was observed with IrO2. Comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymer blends. 1. FTIR studies of urethane-ether blendsMichael M. Coleman, Daniel J. Skrovanek, Jiangbin Hu, and Paul C. PainterCite this: Macromolecules 1988, 21, 1, 59–65Publication Date (Print):January 1, 1988Publication History Published online1 May…
Foreword. Preface. A historical perspective of the rubber industry biosynthesis of rubber latex concentrates - properties and composition technological processing of natural rubber latex rheology of raw rubber compounding injection moulding compounding for tyres blends of natural rubber with thermoplastics chemical mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties of conducting polymersA. O. Patil, A. J. Heeger, and Fred WudlCite this: Chem. Rev. 1988, 88, 1, 183–200Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.acs.org/doi/10.1021/c…
The basis set polarization approach is applied to the generation of medium-size polarized GTO/CGTO basis sets for accurate calculations of molecular dipole moments and polarizabilities. The polarized basis sets determined in this paper for H and C through F are employed in SCF HF and MBPT calculations of dipole moment…
Measurements are reported of the loss per cycle (sinusoidal flux waveform) versus magnetizing frequency f/sub m/(0>
Time-resolved photoluminescence measurements of the layered semiconductors GaSe and GaTe have been made using a mode-locked dye laser a synchronously scanning streak camera. It is shown that at low excitation densities (10 15 -10 17 cm -3 ) exciton dynamics is dominated by trapping at defects. A rate equation model is…
The absolute total electron scattering cross section for CS 2 was measured from 0.4 to 80 eV using a linear transmission method. A minimum cross section (17*10 -20 m 2 ) occurs near 0.8 eV followed by a very broad maximum (53*10 -20 m 2 ) around 9 eV, with a monotonic decrease at higher energies. Comparison is made wi…
Changes in shear elastic constant, long-range order, and lattice parameter were measured during disordering and eventual amorphization of ${\mathrm{Zr}}_{3}$Al by ion irradiation. Large (\ensuremath{\simeq}50%) elastic softening was observed during disordering, and anomalies occurred in all three measured parameters o…
An Introduction to Polyurethanes Making Polyurethanes The Chemistry and Materials of Polyurethane Manufacture Low Density Flexible Foams High Density Flexible Foams Reaction Injection Moulding Rigid Polyurethane Foams Polyurethane Elastomers Polyurethane Adhesives, Binders, Paints, Lacquers, Cellular Coatings and Othe…
We report measurements of the solid-solid thermal boundary resistance Rbd, spanning the temperature range from 1 to 300 K. Below 30 K, Rbd is found to be in agreement with the prediction of the acoustic mismatch model. The influence of diffuse scattering at the interface is found to have a very minor influence on Rbd.…
Abstract The preparation of strongly luminescing sols of Q‐CdS (Q indicates size quantization effect) and of co‐colloids of CdS and ZnS.
We report the first experimental evidence for the existence of free polyexcitons ($n>2$) in a semiconductor. Resolved polyexciton lines, together with the biexciton line, were observed in the green photo-luminescence spectrum of ultrahigh-purity silicon. We propose that the unresolved luminescence of these polyexci…
A quasiperiodic pattern (or quasicrystal) is constructed in real four-dimensional Euclidean space, having the non-crystallographic reflection group (3, 3, 5) of order 14 400 as its point group. It is obtained as a projection of the eight-dimensional lattice E 8 , and has as a cross section a three-dimensional quasicry…
High-resolution electron microscopy shows the coexistence of several distinct core structures for coincident-site lattice boundaries in NiO bicrystals near $\ensuremath{\Sigma}=5, (310)$, and $\ensuremath{\Sigma}=13, (510)$, where $\ensuremath{\Sigma}$ is the reciprocal density of coincident lattice sites. Lattice exp…
The authors consider the relationship between Newman's superposition-model formulae and the recently derived transformation matrices S k ( phi , theta ) for the extended Stevens operators. The coordination factors K k q ( theta , phi ) are shown to be the matrix elements (S k -1 ) 0q . A general expression for K k q i…
The use of solution mixing followed by gelation to make ultrahomogeneous glasses and ceramics of various oxide compositions for laboratory experimentation, with first organic and later principally colloidal inorganic, precursors was developed over 30 years ago. Major technologies that use the solution-sol-gel route ha…
Dipole-relaxation parameters for ${\mathrm{Ce}}^{3+}$-${\mathrm{F}}_{\mathrm{int}{}^{\mathrm{\ensuremath{-}}}}$ centers (${C}_{4v}$ symmetry) in ${\mathrm{CaF}}_{2}$ are calculated using the method of ionic thermocurrents (ITC). The data indicate concentration-dependent effects if analyzed using the traditional ITC eq…