Materials Literature
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Presents a hyperbranched polymer, a hydroxyl functional aliphatic polyester which consists of a polyalcohol core from which branches extend, forming a core‐shell structure with a large number of hydroxyl groups at its peripheral surface. It is polydisperse and consists, apart from the main core/shell fraction, of a mi…
500-kV XLPE-insulated cable with an insulation thickness of 27 mm has been developed for long-distance transmission lines. Basic studies on 500-kV XLPE cable have shown that contaminants in the insulation may be the factor determining electrical performance. This hypothesis is justified by the good correlation obtaine…
Formate is the major source of C1 units in many species of the genus Clostridium. In this study we have cloned and characterized the genes encoding pyruvate formate-lyase and its activating enzyme of Clostridium pasteurianum. The genetic and transcriptional organizations of the genes and the high level of homology exh…
For two compounds of the thiobenzoate series, the Sc*α phase has been studied. For the first time to our knowledge, its helicity is revealed, by observation of very thin liquid crystal drops. Helical pitch measurements have been performed, and the pitch variations versus temperature studied. The pitch is very small fo…
Abstract Combined LC‐polymers possess the structural properties of both LC main chain and LC side chain polymers. Beneath this structural speciality, their broad LC‐phases and their polymorphism (different smectic phases and one nematic phase as a function of temperature) make them interesting. Crucial to an understan…
An apparatus is described for the measurement of second-order nonlinear optical properties via hyper-Rayleigh scattering with 1 cm−1 spectral resolution of the scattered light. The setup allows a complete investigation of the polarization dependence of the second-harmonic scattered light. The combination of good spect…
Many problems in the modelling of materials call for a synthesis of approaches used at both the atomistic and the continuum levels. One notable implementation of this type of strategy is in the construction of local constitutive relations which serve to provide a microscopic underpinning for the energetics of phenomen…
Coordination of ethylenediaminetetraacetic acid (EDTA) with europium(III) has been studied at different concentrations in solution using 7F0 → 5D0 excitation spectroscopy and excited-state lifetime measurements. EDTA forms with Eu(III) ion three different species in equimolar solutions at room temperature. At low pH v…
During the 1970s, reactor safety authorities developed increasing interest in methods for accurately predicting the extent of hazards associated with severe accidents in light water reactors (LWRs). In response to these concerns, out-of-pile experimental projects were initiated by the U.S. Nuclear Regulatory Commissio…
The dependence of Ni Curie temperature, ${\mathit{T}}_{\mathit{C}}$, on the Ni thickness in Co-Ni and Ag-Ni multilayers is reported. It is shown that ${\mathit{T}}_{\mathit{C}}$ increases 60 \ifmmode^\circ\else\textdegree\fi{}C for the Co-Ni samples, as the Ni thickness decreases from 100 to 50 \AA{}. The difference i…
The phase separation behavior and the morphology of polyetherimide (PEI)-modified diglycidyl ether of bisphenol A (DGEBA) epoxy resin were studied using scanning electron microscopy and light scattering. Reaction kinetics, cloud point and onset of gelation were determined by differential scanning calorimeter, optical…
The low-temperature specific heat of $\ensuremath{\kappa}$-${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}$X ($X=\mathrm{Cu}[\mathrm{N}{(\mathrm{CN})}_{2}]\mathrm{Cl} \mathrm{and} \mathrm{Cu}[\mathrm{N}{(\mathrm{CN})}_{2}]\mathrm{Br}$) and $\ensuremath{\kappa}\ensuremath{-…
We have developed a new method for fabrication of microstructures. Using a Si 3 N 4 membrane with small windows as a mask, a metal film with fine structure is vacuum deposited directly onto a substrate. By means of piezoelectric actuators which slide the mask on the substrate, we have fabricated an array of Al/AlO x /…
We report on a systematic study of the thermodynamic superconducting properties on high-quality crystals of the quasi-two-dimensional (quasi-2D) organic superconductor $\ensuremath{\kappa}$-${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}$${\mathrm{I}}_{3}$. Low-field magne…
In-plane alignment of nematic liquid crystals was regulated by polarized-light-irradiation of a cell assembled with a silica plate, the surface of which was modified by attaching 4-hexyl-4′-hexyloxyazobenzene at its o-position through surface silylation. The photoisomerizability of the chemisorbed azo-chromophore was…
The influence of granule character and compaction on the mechanical properties of sintered silicon nitride was studied as a function of the pH of the spray‐dry slurry. The character and the compaction behavior of the spray‐dried silicon nitride granules considerably affect the mechanical properties of the sintered bod…
High-resolution heat-capacity, optical reflectivity, and electron-diffraction measurements have been conducted on thin free-standing films of a liquid-crystal compound exhibiting the smectic-$A$---hexatic-$B$---crystal-$B$ transitions. Despite the absence of herringbone order, the liquid-hexatic transition in extremel…
Abstract Structural transformations of illite-smectite samples of hydrothermal genesis with increasing contents of illite layers were studied by X-ray powder diffraction. The samples were K-saturated and subjected to wetting and drying cycles to increase three-dimensional structural ordering. Diffraction profiles were…
Electrochemistry of Conductive Polymer: XIX. Oxidation of Aniline at Bare and Polyaniline‐Modified Platinum Electrodes Studied by Electrochemical Impedance Spectroscopy, Johnson, Bryan J., Park, Su‐Moon
The structures of six crystalline inclusion complexes of cyclotriveratrylene (1) (CTV) containing water, toluene, bromobenzene, chloroform, acetone and dimethoxyethane have been determined by X-ray crystallography. Four are of the α phase whilst the other two are the first reported structures of the β phase. Based upo…