Materials Literature
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Certain organic vapors induce a morphological transformation in 1,4-dithioketo-3,6-dipheyl-pyrrolo-[3,4-c]-pyrrole (DTPP) which is accompanied by enhanced absorption and photoconduction in the near infrared. In order to gain more insight into this phenomenon, intermolecular charge transfer caused by the vapor treatmen…
Single crystals of yttria-stabilized zirconia (12 mol % of ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$) have been x-ray irradiated at room temperature. The electron paramagnetic resonance spectrum of the filled electron traps is analyzed in terms of a single oxygen vacancy type of defect with its symmetry axis along the 〈111…
Measurements of heat transfer during melting and solidfkation of n-eicosane and rt-hexadecane were performed in vertical cylinders with two different lengths and diameters. Radial temperature distibutions were measured with lime at different heights in all the tests. To evaluate the rate of heat charged and discharged…
Describes some recent studies of adsorbate interactions at oxide surfaces using photo-emission, surface EXAFS and NEXAFS which illustrate the potential of the techniques to provide structural and mechanistic information. The examples chosen are a SEXAFS study of the NiO(100)-H 2 S reaction, which results in reduction…
With the help of selective etchants as-grown domain structure arising as a result of the phase transition and its restruction in electric field is investigated in lead germanate single crystals. It is shown that this structure consists of small counter domains which are enlarged in electric field. By the use of strobo…
Abstract X-Ray powder diffraction and thin section analyses indicate that marginal lacustrine mudstones of the Green River Formation in the south-central Uinta basin, Utah, contain abundant analcime. The analcime has a low Si/Al ratio (<2.31) and occurs as very fine grained disseminated crystals and, to a lesser ex…
Favorable passive reactivity shutdown performance in response to unprotected accident initiators has been shown to be achievable when several measurable, integral reactivity parameters related to the power, flow, and inlet temperature coefficients of reactivity satisfy certain simple constraints among their dimensionl…
The corrosion behavior of 13Cr-martensitic stainless steel was investigated in CO2-H2S-Cl− environments typical of oil and gas wells under different CO2 and H2S partial pressures, with an NaCl content of 50 g/L, pH = 2.7 and 4.8, T = 80°C. The 13Cr was highly corrosion resistant to CO2-induced phenomena (general corro…
The in-frame fusion between two oligomeric enzymes, beta-galactosidase and galactose dehydrogenase, is described. The lacZ gene was fused to the 3' end of the galdh gene with a linker encoding only three amino acids. The purified artificial bifunctional enzyme displayed the enzymic activity of both gene products. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethanol synthesis catalysts based on cesium/copper/zinc oxide/metal oxide (metal = aluminum, chromium, gallium): genesis from coprecipitated hydrotalcite-like precursors, solid-state chemistry, morphology, and stabilityJohn G. Nunan, Paul B. Himelfarb, Richard G. Herman, Ka…
Abstract The structural damage produced by dry grinding and acid leaching of chrysotile was studied by transmission and scanning electron microscopy, infrared spectroscopy, X-ray powder diffraction, and thermogravimetric analysis. Severe dry grinding converted the chrysotile fibers into fragments having strong potenti…
The interactions of CO 2 with a clean Cu(110) surface have been studied both in an ultrahigh-vacuum surface analytical chamber and in an attached, high-pressure cell. No adsorption or dissociation of CO 2 was measured for exposures up to 350 L at 110 K and 250 K. Exposures of 65 to 650 Torr of CO 2 at 400-600 K led to…
During torsional deformation of A1 (purity 99·7%) with 0·1 or 2mm grains at 400°C and 0·2s-1, the flow curve rises to a steady-state plateau of 18 MPa for ∊ = 0·5-3·0 and then gradually decreases by 27% by ∊ = 20, after which it remains constant at about 12°5 MPa. The decrease after the traditional steady-state regime…
ABSTRACT Ten shale samples of Frio and Vicksburg (Tertiary) overpressured shales from Brazoria and Hidalgo Counties, Texas, were examined by transmission electron microscopy (TEM) techniques. Initially, illite and smectite (with some mixed-layer component?) are present in subparallel domains, with smectite packets dom…
The electron energy-loss spectrum due to surface plasmon excitation is studied for objects with arbitrary shape and dielectric constant. Both classical and quantum-mechanical approaches are used. The results are useful for prediction of the energy loss spectrum obtained when using a highly convergent incident electron…
Mineralization processes in the body are controlled by physicochemical and cellular regulation of hydroxyapatite (HA) nucleators and inhibitors. The chemical mechanism of action of HA inhibitors has been studied in vitro using solution pH-stat techniques or Types I and II collagen gel diffusion systems. Three biologic…
Abstract Accurate dynamic mechanical measurements have been performed on semicrystalline isotactic polypropylene over wide ranges of temperature and frequency. A mechanical model has been used to analyze experimental results in order to separate the behavior of amorphous and crystalline phases. The two main α and β re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerforated monolayers: design and synthesis of porous and cohesive monolayers from mercurated calix[n]arenesMichael A. Markowitz, Vaclav Janout, David G. Castner, and Steven L. RegenCite this: J. Am. Chem. Soc. 1989, 111, 21, 8192–8200Publication Date (Print):October 1, 1989…
Abstract Hydrotalcite-like compounds, described by the formula [Zn 1- x Al x (OH) 2 ][(CO 3 ) x /2 · nH 2 O], were prepared by coprecipitation methods at 80°C and characterized by bulk chemical analysis, X-ray powder diffraction (XRD), nuclear magnetic resonance (NMR), and scanning-transmission electron microscopy (ST…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ photoluminescence of titania as a probe of photocatalytic reactionsMasakazu Anpo, Masanori Tomonari, and Marye Anne FoxCite this: J. Phys. Chem. 1989, 93, 21, 7300–7302Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published ini…