Materials Literature
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Abstract Pacific red clays are dominantly allogenic in origin. The allogenic component is derived principally from aeolian dust from central Asia, Australia, and Central America. The highest input of dust is from central Asia. Sedimentation rates of red clays are therefore higher in the North Pacific than in the South…
The semiquantitative estimations of 980°C exothermic reaction products of kaolinite by quantitative X‐ray diffraction (QXRD) and chemical leaching techniques show the formation of a significant amount of amorphous aluminosilicate phase (∼ 30 to 40 wt%). The theoretically expected AlO 4 /AlO 6 ratio in the 980°C reacti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of thermal curing on the structures and properties of aromatic polyimide filmsJwo Huei Jou and Peir Teh HuangCite this: Macromolecules 1991, 24, 13, 3796–3803Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 19…
Microstructural evolution in high purity nickel was investigated by comparing the dislocation substructures formed following torsion deformation with those following rolling. Results from transmission electron microscopy observations and measurements of microdiffraction show a common evolutionary path in rolling and t…
The crystal structure of cimetidine (C10H16N6S) has been solved and refined from high-resolution synchrotron X-ray powder data collected on station 8.3 at Daresbury Laboratory. The structure is monoclinic, P21/n, Z = 4, a = 10.7029 (3), b = 18.8262 (1), c = 6.8266 (2) Å, β = 111.306 (2)°. The data were auto-indexed an…
Abstract Polymer alloys and blends represent one of the fastest growing sectors of the plastics industry. To a large degree, the emphasis has now shifted from developing blends in the reactor to their creation through melt mixing on processing equipment such as extruders. As a result, intense activity is now being dir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal thickening and thinning processes in low-molecular-weight poly(ethylene oxide) fractions. 1. From nonintegral-folding to integral-folding chain crystal transitionsStephen Z. D. Cheng, Anqiu Zhang, Jeffrey S. Barley, Jianhua Chen, Anton Habenschuss, and Paul R. Zsc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrodynamic penetration into parabolic brushesS. T. MilnerCite this: Macromolecules 1991, 24, 12, 3704–3705Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/doi/10.1021/ma00012a036https://doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnion yields produced by low-energy electron impact on condensed hydrocarbon filmsPaul Rowntree, L. Parenteau, and L. SancheCite this: J. Phys. Chem. 1991, 95, 12, 4902–4909Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1…
Abstract Simple relationships exist between the individual phase scale factors derived from Rietveld analysis of multiphase mixtures and (i) the ‘reference intensity ratio’ used in traditional methods of discrete-peak phase analysis, (ii) the phase abundance itself and (iii) the relative pattern intensities in simulat…
A capacitive probe measurement that can be used to quantify the charge density on solid insulators is introduced. Studies performed in the development of a +or-125 kV high-voltage DC (HVDC) gas-insulated converter station and +or- 500 kV HVDC switchgear (HVDC-GIS) are reviewed. The properties and mechanisms of surface…
Electromigration failure is modeled as a nucleation and growth process, where void nucleation is due to the generation of a nonequilibrium vacancy concentration from an electromigration induced mass flux divergence. Following nucleation, voids grow until equaling the width of the conductor, causing an open circuit. It…
Unique paramagnetic liposomal contrast agents were synthesized and utilized for selective augmentation of T1 MR imaging of the livers of normal Balb/c mice. A series of amphipathic gadolinium complexes, which mimic phospholipids, was incorporated into the lamella of small unilamellar liposomes such that they become an…
In the present paper the quartz crystal microbalance is used as a sensitive detector of mass changes taking place during an electrochromic process. Electrochemical and electrochromic characteristics of nickel oxide electrodes strongly depend on the preparation method of the samples. Three different types of materials…
Release of D&C Yellow No. 10 and anhydrous theophylline have been determined from a thermosoftening, hydrophilic matrix, Gelucire 50/13, incorporating a water-soluble additive, polyethylene glycol 4000. As additive level increased, release also increased. The effect of mixtures of Gelucire 50/13 (G50/13) and Gelucire…
Assessing the condition of a GIS by measuring the UHF signals generated in it by partial discharges gives warning of developing faults. The signals are taken from couplers built into the equipment. The couplers are continuously monitored using special amplifying and detection units connected in a digital optical fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Living" titanium(IV) catalyzed coordination polymerizations of isocyanatesTimothy E. Patten and Bruce M. NovakCite this: J. Am. Chem. Soc. 1991, 113, 13, 5065–5066Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 199…
We have examined a series of metaphosphate glasses with 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential ( Z/a ) of the modifying cation from sodium to magnesium causes a systematic change to more shielded isotropic chemical shifts with a concomitant increase…
Abstract A liquid‐crystalline side‐chain polymer with laterally incorporated naphthalene groups in the mesogenic moiety is investigated in binary mixtures with an optical uniaxial low‐molar‐mass liquid crystal. Mixtures with up to 50 mol‐% content of the monomeric liquid crystal show a biaxial nematic phase. At lower…
Uniaxial tension–compression fatigue behavior of 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals was investigated. Hysteresis in the stress–plastic strain curve featured cumulative plastic strain and weakened elastic stiffness. Fracture statistics in terms of cycle‐to‐failure depends strongly on the maximum…