Materials Literature
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The mole fractions of H, H2, CH3, CH4, and C2H2 that were generated in a microwave plasma under conditions typical for diamond deposition are reported. When the methane percentage in the feed gas was <1%, the measured concentrations were surprisingly similar to those reported for a hot-filament system operated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular chemistry of manganese complex [Mn(CO)3(.mu.3-OH)]4: assembly of a cubic hydrogen-bonded diamondoid network with 1,2-diaminoethaneSteven B. Copp, S. Subramanian, and Michael J. ZaworotkoCite this: J. Am. Chem. Soc. 1992, 114, 22, 8719–8720Publication Date (Pri…
Abstract Exothermic reactions of some self igniting fuel‐HNO 3 systems have been examined by the rapid‐scan FIR/thermal profiling technique. A sudden rise in temperature is observed when the liquid oxidizer is dropped onto the solid fuel. Simultaneous monitoring of the gas products of the reaction occurring between p‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance and electron spin echo modulation studies of copper(II) ions in the aluminosilicate chabazite: a comparison of copper(II) cation location and adsorbate interaction with isostructural silicoaluminophosphate-34Maggie Zamadics and Larry KevanCite this: J…
Abstract The modeling of the viscoelastic properties of semicrystalline polymeric matrix composites is discussed. Different mathematical models are applied to describe the development of the storage modulus, measured by dynamic mechanical analysis, as a function of the crystalline content during isothermal crystalliza…
The crystallographic and magnetic properties of the series of R2Fe17CNx, where R=Y, Sm, Gd, Tb, Dy, and Er have been investigated in comparison with those of R2Fe17C and R2Fe17N3−δ. The results indicate that Sm2Fe17CNx, which possesses a higher Curie temperature, a larger saturation magnetization, and a stronger aniso…
The resistance of commercial austenitic, ferritic, and duplex alloys to stress corrosion cracking in a 5% NaOH–2% Na2S–2% Na2CO3–0.2% Na2SO4–0.1% NaCl solution at 150°C has been studied by immersion tests and electrochemical measurements. The effects of alloy composition, solution composition, and test temperature on…
The electrical conductivity of high‐purity, single‐crystal alumina is determined parallel to and perpendicular to the c ‐axis. The mean conductivity of four samples of each orientation is a factor 3.3 higher parallel to the c ‐axis than perpendicular to it. The conductivity as a function of temperature is attributed t…
The 3s and 3p photoelectrons have been measured in pure and Cr-doped ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$, in the antiferromagnetic insulator, paramagnetic metal, and paramagnetic insulator phases. It is found that 3s photoemission provides us with information about local magnetic moments created by 3d electrons in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing-opening isomerization polymerization of cyclic iminocarbonatesMasatoshi Miyamoto, Keigo Aoi, Masao Morimoto, Yoshiki Chujo, and Takeo SaegusaCite this: Macromolecules 1992, 25, 22, 5878–5885Publication Date (Print):October 1, 1992Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHairpin configurations of triblock copolymers at homopolymer interfacesT. P. Russell, A. M. Mayes, V. R. Deline, and T. C. ChungCite this: Macromolecules 1992, 25, 21, 5783–5789Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published in…
We demonstrate cw optical bistability at 1.06 μm using the large thermo-optical nonlinearity from the metal-semiconductor phase transition in a thin-film interference filter of vanadium dioxide. Highly stable and reproducible operation has been obtained. By biasing at the transition point, an all-optical external swit…
Abstract Photon correlation spectra of polarized scattered light from poly( n ‐hexylmethacrylate) PHMA (M w = 1.6·10 5 , T g = −5°C) have been studied in the temperature range of −2–25°C. The experimental time correlation functions over the time range 10 −6 −10 2 s were represented by the Kohlrausch‐Williams‐Watts (KW…
A small amount of graphite dust is present in the primary cooling system of a graphite, moderated gas-cooled reactor during normal operation and condensable fission products may be absorbed on the dust. Since it is possible that the fission products are released with dust under the accident conditions such as depressu…
The coefficient of thermal expansion (CTE) of a 140‐μm‐diameter SiC monofilament was determined to be 6.5 ± 0.5 × 10 −60 C −1 in the temperature range 25°–900°C. Heat treatment of the fibers at 1400°C for 90 min resulted in both an increase in the intensities of the SiC peaks and a reduction of their width, indicating…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFramework alkali metal zinc orthoborates: AZn4(BO3)3 (A = K, Rb, Cs)Robert W. Smith, Jeanne L. Luce, and Douglas A. KeszlerCite this: Inorg. Chem. 1992, 31, 22, 4679–4682Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of "scale" mineral solubilities. 4. Experimental measurements of strontium sulfate(s) in water and aqueous sodium chloride from 25 to 250 .degree.C and from 1 to 500 barRobert D. Howell, Krishnam Raju, and Gordon AtkinsonCite this: J. Chem. Eng. Data 1992, 37,…
Abstract Some itaconic acid derivatives were prepared and polymerized, in which itaconic acid (IA), β ‐monoalkyl itaconates (mRI), dialkyl itaconates (DRI), N ‐substituted itaconamates (IAE), itaconamides (IAm), itaconic anhydride (IAn), N ‐alkylitaconimides (RII), and N ‐(alkyl‐substituted phenyl)itaconimides (RPhII)…
Stoichiometric albite glass (NaAlSi 3 O 8 ) was seeded with 5 wt% crystalline anorthite (CaAl 2 Si 2 O 8 ) to make albite glass‐ceramics. The epitaxial crystallization of the albite glass to the glass‐ceramics was investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectr…
Abstract Gas permeability and permselectivity are investigated for polybenzoxazoles from bis (3‐amino‐4‐hydroxyphenyl)‐1,1,1,3,3,3‐hexafluoropropane (BAHHP) and aromatic diacid chlorides. Effects of thermal cyclization on the permeation properties are also investigated. The polybenzoxazole from BAHHP and 4,4′‐(1,1,1,3…