Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResistivity to sulfur poisoning of nickel-alumina catalystsIenwhei Chen and Dar Woei ShiueCite this: Ind. Eng. Chem. Res. 1988, 27, 8, 1391–1396Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1988https://pubs.ac…
Abstract A Round Robin has been organized by the Working Party of the European Federation of Corrosion on Surface Science and the Mechanisms of Corrosion and Protection. 1 Ten European laboratories participated in this Round Robin. 2 The aim was to compare the results obtained by AES and ESCA analyses of passive films…
Evidence is presented for a new pathway of acetone metabolism in Thiosphaera pantotropha. The initial step involves a carboxylation, probably resulting in the formation of acetoacetate. Cells grown on acetone and propan-2-ol fixed large quantities of 14CO2, in contrast to cells grown on acetate and acetoacetate. Growt…
A very-high-sensitivity magnetometer is described in detail. The sensitivity of the apparatus is typically of the order of 10−9 A cm2/(Hz)1/2, so that changes in magnetic moment of 10−10 A cm2 can be detected. The magnetic moment can be calculated by simulation of the measurement system. An example of a hysteresis loo…
The stability constant for the formation of CuSO_3 has been determined spectroscopically to be K = (1.8 ± 0.6) x 10^4 M^(-1) at µ = 0.4 M. The magnitude of this constant is large compared to that of the stability constants of simple inorganic complexes of Cu(II) such as CuSO_4, CuCl^+, CuClO^+, and CuNO_3^+. Infrared…
The electrical properties of n-CdS/p-CdTe heterojunctions depend strongly on the cleanliness of the interface region. In this work, CdTe films were deposited on CdS/glass substrates by close-spaced sublimation (CSS) under various conditions. The dark current-voltage characteristics of the resulting heterojunctions wer…
Abstract The temperature dependences of 1 H spin‐lattice relaxation times T 1 , at the Larmor frequencies of 10.5, 16.0, 20.0, and 45.5 MHz, and of 1 H NMR second moments M 2 were determined for (pyH)AuCl 4 and (pyH)AuBr 4 , where pyH + indicates a pyridinium ion. The small M 2 data less than 1 G 2 obtained above ca.…
MgO‐SiO 2 glasses containing up to 15 mol% MgO, which could not have been prepared by the conventional glass‐melting method because of the presence of stable liquid‐liquid immiscibility, have been synthesized by the sol‐gel technique. The gelling time decreased with increase in magnesium content, water: TEOS ratio, an…
The oxidation of [Os(P)(CO)(EtOH)] (P = porphyrin dianion) to [Os(P)(O)2] by m-chloroperoxybenzoic acid in CH2Cl2 proceeds through a stable Os(IV) intermediate. The [Os(p-X-TPP)(O)2] (X = Cl, H, OMe, Me) and [Os(TMP)(O)2] complexes have been characterized by UV-vis, 1H NMR, and IR spectroscopy. The crystal structure o…
It is currently possible to grow nearly perfect strained-layer semiconductor heterostructures. Experimental evidence shows that misfit dislocation sources become active almost immediately as the layer thickness exceeds the equilibrium critical thickness. These dislocation sources do not seem related to obvious causes,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface and bulk structure of segmented poly(ether urethanes) with perfluoro chain extenders. 3. Effects of annealing, casting solvent, and casting conditionsSung Chul Yoon and Buddy D. RatnerCite this: Macromolecules 1988, 21, 8, 2401–2404Publication Date (Print):August 1,…
The usefulness of liquid crystals in many applications relies on the possibility to induce structural changes by an externally applied agent, e.g. an electric field. The dynamical behaviour of the related switching processes may often be described by introducing a suitable viscosity term in the equation of motion. Vis…
The phase chemistries and microstructures of titanate‐based ceramics containing simulated high‐level nuclear waste with varying sodium contents were compared. Incorporation of relatively low sodium levels (∼0.9 wt% Na 2 O) resulted in more complex phase assemblages. The principal hosts for sodium were hibonite and fre…
Summary Soluble proteins and Ca and P salts in the fouling deposit on a mineral microfiltration membrane obtained in static conditions were analysed and compared with those found using dynamic filter conditions in a laboratory pilot installation for milk processing. The serum milk proteins were retained by the porous…
The objective of this study is to alter the fiber morphology of a linear aliphatic polyester, polyglycolic acid, by annealing treatment and to examine the changes of its degradation properties. The annealing was done at 150 degrees C, 170 degrees C, and 190 degrees C, and the specimens were annealed in four different…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of the nickel(I) octaethylisobacteriochlorin anion with alkyl halidesAlan M. Stolzenberg and Matthew T. StershicCite this: J. Am. Chem. Soc. 1988, 110, 16, 5397–5403Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCylindrical versus spherical micelle formation in block copolymer/homopolymer blendsAnne M. Mayes and Monica Olvera de la CruzCite this: Macromolecules 1988, 21, 8, 2543–2547Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissu…
Analogs 1-8 of diaminopimelic acid (DAP) were synthesized and tested for inhibition of purified meso-DAP D-dehydrogenase from Bacillus sphaericus and of LL-DAP epimerase from Escherichia coli. The dehydrogenase was assayed by monitoring NADPH formation spectrophotometrically at 340 nm. N-Hydroxy DAP 4, N-amino DAP 5,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous catalytic photochemical functionalization of alkanes by .alpha.-dodecatungstophosphate. Rate behavior, energetics, and general characteristics of the processesRoman F. Renneke and Craig L. HillCite this: J. Am. Chem. Soc. 1988, 110, 16, 5461–5470Publication Date…
Abstract The sintering of montmorillonites pillared by hydroxy-Al species was investigated by several techniques. The change of the microporosity of the pillared interlayer clay with temperature shows that sintering was mainly due to the loss of microporosity. On calcination of the parent clay at 760°C, the X-ray powd…