Materials Literature
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Three new compounds, Ag 2 HgGeS 4 , Ag 2 HgSnS 4 , and Ag 2 HgSnSe 4 , crystallizing in the wurtzstannite type structure have been prepared by solid state reactions at 700°C and characterized by X-ray powder methods. A fourth compound of similar composition Ag 2 HgGeSe 4 , with an hitherto unknown structure crystalliz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe microstructures of commercially available poly(3-hydroxybutyrate-co-3-hydroxyvalerate)sYoshio Inoue, Naoko Kamiya, Yasuhiko Yamamoto, Riichiro Chujo, and Yoshiharu DoiCite this: Macromolecules 1989, 22, 9, 3800–3802Publication Date (Print):September 1, 1989Publication Hi…
The effect of hot isostatic pressing on the bend strength of ZrO 2 –3 mol% Y 2 O 3 was critically dependent on the presintering process. Optimally sintered bodies contained no open porosity and exhibited large increases in strength following hot isostatic pressing. When open porosity of as little as 0.3% persisted aft…
The microhardness of mullite single crystals was measured at temperatures to 1000°C. The hardness decreased from about 15 GPa at room temperature to about 10 GPa at 1000°C. Thus, the mullite at 1000°C had a higher hardness than sapphire, approaching the value of SiC, but at room temperature was softer than both materi…
The austenitic stainless steels used today for the manufacture of osteosynthesis devices are sensitive to crevice corrosion. In this study the corrosion properties of some duplex stainless steels were evaluated and compared to traditional austenitic stainless steels. According to our results the following ranking was…
Dielectric measurements of the ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}/\mathrm{e}\mathrm{m}\mathrm{p}\mathrm{h}>(\mathrm{N}{\mathrm{H}}_{4}}$${)}_{\mathrm{x}}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ (x=0.35) mixed crystals in the a and c tetragonal directions in the temperature range from 3 to 300 K are r…
<div class="htmlview paragraph">An increasingly important step in the design of three-way catalytic converters is having the ability to evaluate deactivation of potential catalyst formulations with accelerated testing. Most accelerated tests involve deactivating the catalyst by thermal (i.e., high temperature) a…
An order parameter functional method is proposed which permits description of structural order-disorder phase transitions. A feature peculiar to the method is that the probabilities of all atomic groups (clusters) are represented in terms of a distribution function that is immediately related to the long-range order p…
Abstract Plasma polymerization of perfluorobenzene/sulfur dioxide (PFB/SO 2 ) mixture was investigated by elemental analysis, infrared spectroscopy, and XPS. Plasma polymer films like Nafion were obtained from the plasma polymerization of PFB/SO 2 mixture. The plasma polymerization deposited fluoropolymers with sulfur…
Abstract The same base resin, a HDPE with vinyl–silane units grafted along the backbone, was subjected to three different types of crosslinking: (a) using peroxides and heat, (b) using a catalyst under high humidity, and (c) using high‐energy radiation. Macroscopic properties, such as tensile behavior‐at‐break, shear…
This paper describes a device that effectively produces a unique staple-core/cotton- wrap composite yarn on a slightly modified ring spinning frame. Such a yam consists of a man-made staple fiber core that is wrapped with cotton fibers. The core provides high strength and other functional characteristics, while the wr…
The electrical conductivity of single crystals of ${\mathrm{Na}}_{2}$${\mathrm{SO}}_{4}$ has been measured along the three principal crystallographic axes at temperatures in the range 160--400 \ifmmode^\circ\else\textdegree\fi{}C. The measurements reveal a hitherto unsuspected large anisotropy in the ${\mathrm{Na}}^{+…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(oxy-2,6-naphthalenediylcarbonyl)A. Muehlebach, J. Lyerla, and J. EconomyCite this: Macromolecules 1989, 22, 9, 3741–3746Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Septembe…
In this article we present results of optical and ESR studies that have allowed us to study the behavior of ${\mathrm{Cr}}^{3+}$ at disordered low-field sites within a mullite ceramic host. The results indicate that the existence of these low-field ions, which are likely at sites in regions of disorder, accounts for m…
Abstract The thermal stability and degradation behavior of a series of nine different exactly alternating silphenylene‐siloxane polymers which contained methyl, vinyl, hydrido, 3,3,3‐trifluoropropyl, and tridecafluoro‐1,1,2,2‐tetrahydrooctyl side groups, or their combinations, were investigated by dynamic and isotherm…
Electrocrystallization or even reaction with a copper wire leads to conversion of two 2, 5-disubstituted DCNQIs (1 and 2) into the alloy 3. Such an alloy displays metallic conductivity. Moreover, the phase transformation that normally causes the pure components to become semiconductors upon cooling can be suppressed t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a bis(oxo)-bridged MN(III)Mn(III) complex, bis(.mu.-oxo)bis[N,N'-bis((6-methylpyrid-2-yl)methyl)ethane-1,2-diamine]dimanganese(III) perchloratePatricia A. Goodson and Derek J. HodgsonCite this: Inorg. Chem. 1989, 28, 18, 3606–3608Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of sulfate species on magnesium oxideM. Bensitel, M. Waqif, O. Saur, and J. C. LavalleyCite this: J. Phys. Chem. 1989, 93, 18, 6581–6582Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 1989htt…
The hdc gene coding for the pyridoxal 5'-phosphate dependent histidine decarboxylase from Morganella morganii has been expressed in Escherichia coli under control of the lac promoter. The enzyme accumulates to 7-8% of total cell protein and is purified to homogeneity by passage through three columns. Fourteen site-dir…
With the development of new ceramic materials, including those for structural applications, there is an increasing demand to join, ceramic components to metal structures. One of the major problems of joining ceramic to metal is the thermal expansion mismatch between them. Generally, the ceramic materials have lower th…