Materials Literature
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Banana-shaped compounds form several new smectogenic phases specific to this class. Several two-dimensional phases have been observed, and these can exhibit very complex and beautiful optical textures (see Figure). These phases are reviewed and their structures investigated by not only X-ray diffraction and nuclear ma…
A third crystalline modification of dodecaphenylporphyrin is described in which the pyrrole nitrogen atoms are hydrogen-bonded to two ethanol molecules. This is the first crystallographic proof for the accessibility of nitrogen atoms in saddle-distorted free base porphyrins for hydrogen bonding. No such coordination i…
Studies have been carried out to convert carpet waste into valued products. Two common processes, injection and compression molding, can be used to recycle carpet waste. Three types of carpet waste have been recycled: (1) edge trim from carpet manufacturing, (2) polypropylene shear lint from cutting tufted carpet loop…
Material evolution laws, such as those implicit in theories of plasticity and growth, are subjected to a systematic treatment. Using some concepts borrowed from the theory of inhomogeneities, the evolution of the material structure for materials of first and second order is expressed in terms of first-order differenti…
Thermal diffusivity of AlN‐based ceramics was studied as a function of second‐phase amount and heat‐treatment time. The Y 2 O 3 ·Al 2 O 3 contents varied over the range of 13‐31 vol%. The thermal diffusivity decreased as the amount of second phase increased. After sintering at 1850°C, the AlN ceramics consisted of rou…
Transparent PLZT(7/60/40) ceramics with large piezoelectric coefficients were obtained using a two‐step sintering process with controlled oxygen partial pressure. Specifically, low‐oxygen‐pressure and low‐temperature sintering were used in the first step, followed by a high‐oxygen‐pressure, high‐temperature sintering…
Abstract This work is concerned with determining how to effectively recycle wholly thermoplastic composites comprised of a polypropylene (PP) matrix reinforced with a thermotropic liquid crystalline polymer (TLCP). A novel reclamation process was developed in which the TLCP could be recovered from the PP matrix. React…
Magnetic and electrical transport properties of ${\mathrm{SmNi}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3}$ perovskites, with $0<~x<~1,$ have been studied in the temperature range $5<~T<~700\mathrm{K}.$ This series shows paramagnetic metal, paramagnetic insulator, antiferromagnetic insulator, and…
A stretching device suitable for fitting within a deuterium nuclear magnetic resonance (NMR) probe was constructed to investigate the large strain uniaxial tensile deformation behavior of nylon 6 plasticized by 40 wt % of phenol- d 5 . The phenol- d 5 molecules probe the environment of the amorphous regions in nylon 6…
The hydrolysis and transesterification of RNA are catalyzed by a variety of metal ions, metal complexes, metalloenzymes, and ribozymes. These reactions are of fundamental biochemical importance. However, the role that metal ions play in RNA hydrolysis is not completely understood. We previously showed that aqueous Cu(…
The influence of morphology on the electrical properties of syndiotactic polypropylene (sPP) has been investigated in comparison with those of conventional isotactic polypropylene (iPP). The evolution of spherulite in sPP occurred at a lower temperature than in iPP, and the size of spherulites in sPP is much smaller t…
Abstract The finest fractions of Upper Jurassic shales from the North Sea and onshore Denmark contain 80–90% of an illite-smectite-vermiculite (I-S-V) mixed-layer mineral and, in addition a phase which has X-ray diffraction (XRD) peaks at 7.20–7.26 Å and 3.56–3.58 Å in air- dried and glycolated specimens. This phase m…
The use of classic anticorrosive pigments is becoming more and more restricted by increasing environmental concerns; they are gradually being replaced by zinc phosphate and related compounds. Other anticorrosive pigments such as surface-exchanged silicas were also proposed. The object of this research is to study the…
In vitro folding of mature subtilisin is extremely slow. The isolated pro-domain greatly accelerates in vitro folding of subtilisin in a bimolecular reaction whose product is a tight complex between folded subtilisin and folded pro-domain. In our studies of subtilisin, we are trying to answer two basic questions: why…
A theoretical model is used to analyze the transport of U and Zr in electrorefining of irradiated binary Experimental Breeder Reactor-II fuel. A limiting-current hypothesis is advanced to explain the observed dissolution of Zr in the presence of U at high, intermediate, and low cell voltages. The internal diffusion mo…
The influence of heat treatment at and above $1100\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ on thin erbium-rich silica layers embedded in silica has been studied experimentally by secondary ion-mass spectrometry and cross-sectional transmission electron microscopy. Redistribution of erbium atoms is observed at th…
The scope of the following paper is to present, both from a theoretical and a practical point of view, some aspects involved in stress grading in the general configuration where insulated HV conductors pass through a grounded screen. The difference between capacitive and resistive materials is discussed; particular at…
This report describes space charge behavior of polyethylene (PE) grafted with acrylic monomers such as acrylic acid (AA), methacrylate (MA), ethylacrylate (EA) and n-butyl acrylate (NBA). The specimens were 0.7 mm thick with semicon electrodes, and vacuum degassed. Heterocharge is found in ungrafted control PE. This h…
Abstract The solvating strength of a plasticizer for poly(vinyl chloride) resin is a measure of the interactive forces between these two materials. Hansen's three‐dimensional solubility parameters provide a quantitative measure of these interactive forces. By using CO‐ACT SM service, a computer program designed for so…
The broadening of the ${}^{4}{\stackrel{\ensuremath{\rightarrow}}{{T}_{2}}}^{4}{A}_{2}$ luminescence band in ${\mathrm{Cr}}^{3+}$-doped aluminosilicate glasses is investigated experimentally and the results modeled using a technique that assumes contributions due to variation in both crystal-field strength and electro…