Materials Literature
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The densification of Al 2 O 3 –30TiC (in weight percent) composite is investigated as a function of Y 2 O 3 additions. It is observed that very small amounts of Y 2 O 3 are effective in aiding the densification. The density was observed to pass through a maximum at 0.35 wt% of Y 2 O 3 . The gas‐generating reaction of…
In the past several years, "Shingosen," or new synthetic fibers have been developed in Japan. Polyester fibers and fabrics have attained a new status among other synthetic and natural fibers and textiles, and the Japanese have begun to recognize that recent polyester products are comparable to natural fibers such as s…
Abstract The radical grafting of C n F 2n +1 CH 2 CH 2 SH ( n = 6,8) onto the double bonds of hydroxyl‐terminated liquid polybutadienes (HTPBD) was studied. Various methods for investigating the amount of grafting (titration of residual thiol and fluorine analysis) were used and compared. The nature and the amount of…
The advantage of fast firing depends not only on the finer grain‐size effect at the sintering temperature, but also on the smaller pore‐size effect which results from the restricted pore growth. Pore growth due to the differential sintering during heating was observed to occur at relatively low temperature regions, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxyl radical formation during the reaction of oxygen with methane or water over basic lanthanide oxide catalystsLouis C. Anderson, Mingting Xu, Charles E. Mooney, Michael P. Rosynek, and Jack H. LunsfordCite this: J. Am. Chem. Soc. 1993, 115, 14, 6322–6326Publication Dat…
Results are presented of a systematic finite element (FEM) simulation of power transformer susceptibility to geomagnetically induced currents (GICs). DC saturation patterns for five different transformer core designs are examined using FEM. Magnetic fields along various traverses are provided. Impedance matrix entries…
Sintered magnets of Sm2Fe17Ny nitrides, with a density of 6.0–7.4 g/cm3, have been prepared by using an explosion technique. Both crystalline structure and the magnetic properties of Sm2Fe17Ny nitrides were retained in the process. The sintered magnet had a remanence Br=0.83 T, an intrinsic coercivity μ0iHc=0.57 T and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential-dependent conductivity of conducting polymers yields opportunities for molecule-based devices: a microelectrochemical push-pull amplifier based on two different conducting polymer transistorsChristopher H. McCoy and Mark S. WrightonCite this: Chem. Mater. 1993, 5,…
The effect of submicron‐sized particles on the corrosion of copper has been investigated in mixtures at 373 K and relative humidities (RH) of 65, 75, and 88%. At 65% RH, particles do not affect the oxidation of copper. At 75% RH, the "critical relative humidity" of , localized formation of and a basic copper sulfate,…
Supercritical carbon dioxide is known to be a very good swelling agent and plasticiser for poly(methyl methacrylate), a consequence of an interesting combination of liquid-like and gas-like properties exhibited by supercritical fluids. Making use of this behaviour, we have studied a constant temperature process of gen…
After an Introductory Part, presenting a survey of the present knowledge of nitrous oxide chemistry related to fossil fuel combustion and flue gas treatment, as a background for the understanding of emission factors, the paper deals successively with the average N2O emission factors from combustion and other industria…
Photo‐ and electroactive amorphous molecular materials are attractive for use in electronics, for example in pn heterojunction‐type photovoltaic devices or in electroluminescent devices. The title compound (based on that in the Figure) exhibits a high glass transition temperature, hardly crystallizing even above this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new method for regiospecific deuteration and reduction of 5,10,15,20-tetraphenylporphyrins: nucleophilic reaction of borohydride ion with 2-nitro-5,10,15,20-tetraphenylporphyrinsMaxwell J. Crossley and Lionel G. KingCite this: J. Org. Chem. 1993, 58, 16, 4370–4375Publicati…
For pt.XVI see ibid., vol.9, no.3, p.21 et seq. (1993). Early investigations into partial discharge (PD) phenomena are reviewed to illustrate how little has changed and how much has, in some respects, been repeated during the forty years from 1940 to 1980. The early days of PD research included studies of PD in gas-fi…
Silicon is used in the fabrication of microelectromechanical systems (MEMS). The friction and wear characteristics are of major design concern for any mechanical device requiring relative motion. In the present investigations we have studied the influence of ion bombardment on the microstructure, crystallinity, compos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of uncertainties in thermodynamic data and model parameters on calculated process performanceWallace B. Whiting, Ting Man Tong, and Michael E. ReedCite this: Ind. Eng. Chem. Res. 1993, 32, 7, 1367–1371Publication Date (Print):July 1, 1993Publication History Published…
Abstract Much work in recent years had focused on the improvements of the impact properties of engineering thermoplastics by the addition of a low modulus modifier that contains polar moieties as a result of polymerization or that has been modified to contain polar moieties as a result of various grafting techniques.…
The crystal structure of a transition state/product complex formed by the interaction between proteinase K and the substrate analogue N-Ac-L-Pro-L-Ala-L-Pro-L-Phe-D-Ala-L-Ala-NH2 has been determined at a resolution of 2.2 A and refined to an R-factor of 0.165 for 12,725 reflections. The inhibitor forms a stable comple…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCommensurate and incommensurate lattice distortions in dysprosium selenide (DySe1.84) and rubidium dysprosium selenide (Rb0.33DySe2.67)Brendan Foran, Stephen Lee, and Meigan C. AronsonCite this: Chem. Mater. 1993, 5, 7, 974–978Publication Date (Print):July 1, 1993Publication…
Abstract A new type of biodegradable polymer material, poly(caprolactone)–poly(ethylene glycol) block copolymer (PCL‐b‐PEG), was synthesized by means of direct copolycondensation of ε‐caprolactone with poly(ethylene glycol) in the presence of a Ti(OBu) 4 catalyst. The degradability of the polycaprolactone was improved…