Materials Literature
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The influence of a range of α,ω-dicarboxylates on the morphology of calcite crystals grown from supersaturated bicarbonate solutions was studied by optical and scanning electron microscopy. At Ca/malonate ≈ 3, spindle-shaped crystals elongated along the c axis and with curved {1text-decoration:overline10} prismatic fa…
Water tree growth in polyethylene cable insulation is discussed. The characteristics of water trees, the effect of aging parameters on water tree growth, and the possible mechanisms of growth are considered, emphasizing vented tree development in polyethylene insulating materials. The morphology of water trees, the ch…
Rare‐earth aluminosilicate glasses of the general formula 20R 2 O 3 · 20Al 2 O 3 · 60SiO 2 have been formed for 10 of the 14 possible rare‐earth oxides. Two series of “mixed‐rare‐earth” glasses were also formed (Nd/Er and Nd/Y). These glasses exhibit exceptionally high glass transformation temperatures, moderate therm…
An expression is derived for the complex amplitude transmittance of the liquid crystal TV (LCTV) and verified experimentally. It is shown that spatial phase modulation is realizable with good linearity, high transmission efficiency, and small intensity distortion. Although the commercial LCTV does not provide a suffic…
Recent studies have established that many compounds composed of disc-shaped molecules exhibit stable thermotropic liquid crystalline phases. They are now referred to as discotic liquid crystals. Structurally, most of them fall into two distinct categories, the columnar and the nematic. The columnar phase, in its simpl…
By means of inelastic cold neutron scattering the density of vibrational states (DVS) has been determined for a series of vitreous materials: SiO 2 , As 2 S 3 and metallic glass Mg 70 Zn 30 . In the low-energy range of the spectrum ( E ∼ (2 ÷ 10) meV) for these materials DVS reveals a universal, but non-Debye form. Th…
Molecular orientational structures in MHPOBC were studied by means of conoscope observation. Contrary to a ferroelectric response of the conoscope to an electric field in the smectic C * phase, the conoscopic figure in the antiferroelectric smectic C A * phase does not shift its center and is biaxial with its optic pl…
We have prepared polyacetylene (ν-(CH) x ) yielding a conductivity of more than 10 5 S/cm, by making some modifications on Naarmann et al.'s method. Structural analyses of this polymer were carried out by use of various analysis techniques such as SEM, IR and resonance Raman spectroscopy to characterize ν-(CH) x . No…
P. C. B. Page, S. S. Klair and S. Rosenthal, Chem. Soc. Rev., 1990, 19, 147 DOI: 10.1039/CS9901900147
Abstract A thermodynamic analysis of polymer particle morphology highlights the role of interfacial tensions in controlling particle structure. The influence of the surfactant and the nature of the incompatible polymers is seen through their individual and collective effects upon these interfacial tensions. It has bee…
Resonance Raman spectra with variable-wavelength excitation are reported for nickel octaethylporphyrin and its isotopomers containing <sup>15</sup>N, and <sup>2</sup>H at the methine (meso-d<sub>4</sub>) and methylene (methylene-d<sub>16</sub>) carbon atoms. The <sup>15</sup>N, meso-d<sub>4</sub> double isotopomer is…
Resonance Raman spectra with variable-wavelength excitation are reported for Ni<sup>II</sup> porphine (NiP) and for the pyrrole-d<sub>8</sub>, meso-d<sub>4</sub>, and (pyrrole + meso)-d<sub>12</sub> isotopomers, as well as for Ni<sup>II</sup> meso-tetraphenylporphine (NiTPP) and its pyrrole-<sup>15</sup>N<sub>4</sub>,…
This book contains the proceedings of the Fourth International Conference on the Effect of Hydrogen on the Behavior of Metals. Included are the following papers: The influence of microstructure on hydrogen transport in nickel-base alloys, Hydrogen uptake during cadmium electroplating, Hydrogen, embrittlement in lean u…
In this paper we describe the details of several model Hamiltonian cluster calculations, suitable for describing various spectroscopic data of CuO. By treating the d-d Coulomb and exchange interactions within the full atomic multiplet theory and using symmetry-dependent Cu-O hybridizations, we do a detailed comparison…
Chemically prepared poly(N-alkyldiphenylamine) polymers are conductive and electrochemically reversibly dopable in organic and aqueous solutions; cast polymer films exhibit multiple, reversible colour changes in 1 M LiCLO4 in acetonitrile or 1 M HClO4 aqueous under potential cycling between 0.0 and 1.0 vs. Ag/AgCl or…
Three protein binding sites have been identified in the upstream region of the sericin-1 gene. Two of them, SA and SC sites, have been known as putative cis-acting elements. Using synthetic oligonucleotides of these binding sites, it was found that silk gland factor-1 (SGF-1) binds to the SA site, and silk gland facto…
We have grown ultrathin films of layered transition metal dichalcogenides (MoSe2,NbSe2) heteroepitaxially on cleaved faces of mica (muscovite). This is the first success in the heteroepitaxial growth between highly heterogeneous layered materials having different crystal structures and lattice constants that differ by…
Abstract
Abstract To describe the experimental data of the line strength and the oscillator strength of electric dipole transition between manifolds a formula is suggested that takes into account the dependence on the energy of manifolds and the effect of electron correlation. It contains four phenomenological parameters and i…
A new process using pulse electric discharging for modification of solidification structures was investigated. If an extremely high voltage or high current is applied to solidifying metallic alloys by discharging a capacitor bank, large pressure gradients result, which produce strong local shear, and can be expected t…