Materials Literature
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Methods of computer molecular dynamics have been applied to model a 𝒥 = 5 symmetric-tilt coincidence grain boundary. A pairwise Lennard-Jones 6–12 potential was used to simulate the atomic interactions in a bicrystal containing up to 396 atoms. At simulated temperatures of approximately half the potential well depth t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study of o-quinone complexes of chromium and vanadiumDouglas J. Gordon and Richard F. FenskeCite this: Inorg. Chem. 1982, 21, 8, 2907–2915Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published inissue 1 August 1982https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of an iron-nitrene complex from the dioxygen- and iron porphyrin-dependent oxidation of a hydrazineD. Mansuy, P. Battioni, and J. P. MahyCite this: J. Am. Chem. Soc. 1982, 104, 16, 4487–4489Publication Date (Print):August 1, 1982Publication History Published online…
Binary iron‐base alloys containing chromium additions of 3, 9, 12, and 18% were passivated in borate buffer ( p H 8.4). The passive films formed on these alloys were investigated by Auger, ESCA, and SIMS techniques. For the Fe‐3Cr alloy passivated in the potential range 0.65–1.45V vs. RHE, the Auger spectra showed neg…
Cells of a pseudomonad associated with pipeline corrosion grown on a complex medium were orange in color and vigorously reduced ferric iron. The intensity of orange color of cells grown on a synthetic medium and their ability to reduce ferric iron was directly related to the iron content of the medium. Absorption spec…
Abstract A procedure has been developed for characterizing cellulose ethers on the basis of the distribution of substituent groups along the polymer backbone. This method has been applied to carboxy‐methylcellulose. The technique uses cellulase, a cellulose‐degrading enzyme. Degradation as a function of time is follow…
Abstract A review is made of the basic assumptions used in quantitative XPS. Particular attention is paid to problems of electron shake up and shake off, and to the angular distribution of ejected photoelectrons. Following this review, the interaction of XPS with other surface analyses is discussed and illustrated for…
Article Electron-density distributions of three orthopyroxenes, Mg2Si2O6, Co2Si2O6, and Fe2Si2O6 was published on August 1, 1982 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 158, issue 1-2).
Abstract Die bislang unbekannten peripher substituierten trans ‐Dihalogeno(tetra‐ tert ‐butylphthalocyaninato)metall‐IVB‐Derivate 5a , b und 6a , b sowie trans ‐Dichloro[tetrakis(trimethylsilyl)phthalocyaninato]germanium ( 6c ) wurden durch Umsetzung mit verschiedenen 1‐Alkinyl‐Grignardverbindungen 9a – e in die monom…
Experimental evidence for the existence of optically biaxial lyotropic nematics is presented. The first experimental measurements of the optical uniaxial birefringence $\ensuremath{\Delta}n$ versus the temperature in a discotic nematic are reported; they show a discontinuity of $\ensuremath{\Delta}n$ at the discotic-c…
The dislocation-free zone (DFZ) model of fracture has been extended to study the relationship between the stress intensity factor, extent of plastic deformation, and crack tip geometry of an elastic-plastic crack as a function of applied stress. The results show that the stress intensity factor K decreases from the el…
Abstract Phase separation in a segmented polyurethane has been studied by differential scanning calorimetry. The glass transition temperature of the soft phase decreases logarithmically with time to a limiting value at each annealing temperature. The magnitude of the decrease is larger at low annealing temperatures, b…
Abstract not Available.
We consider the long-wavelength behavior of smectic liquid crystals (or any solid developing periodic order in only one direction) in the presence of anharmonic terms dictated by symmetry considerations. We analyze this anharmonic model of smectics with the use of analytic renormalization-group techniques directly in…
Infrared absorption and variable excitation (4067, 4131, 5145, and 5682 Å, near the B, Q, and Q0 absorption maxima) resonance Raman spectra are reported for NiPP (PP = protoporphyrin IX dimethyl ester) and for NiPP-dα (vinyl α-carbons deuterated) and NiPP-d2β (vinyl β-carbons dideuterated). The deuteration shifts and…
This work shows that molecular structural variations can be introduced in oxide systems, including AI 2 O 3 , ZrO 2 , TiO 2 , and SiO 2 , by controlled hydrolysis and polymerization reactions during the formation of oxides from metal alkoxides. The chemical and stoichiometric makeup of hydroxides and oxides is not fix…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic circular dichroism studies. 61. Substituent-induced sign variation in the magnetic circular dichroism spectra of reduced porphyrins. 2. Perturbed molecular orbital analysisJoseph D. Keegan, Alan M. Stolzenberg, Yu Cheng Lu, Robert E. Linder, Guenter Barth, Albert Mo…
The solubility of magnesium ammonium phosphate hexahydrate (MgNH4PO4·6H2O) was determined in aqueous solution at 25, 35, 38, and 45C. The thermodynamic solubility product was determined at each temperature.
The environmental and metallurgical factors in the intergranular stress corrosion cracking of austenitic stainless steel at temperatures below 100 C has been examined. The behavior of annealed and sensitized microstructures in a variety of environments, including oxygen-containing pure water and aqueous solutions cont…
Abstract The various pathways of degradation of polyurethane based on MDI and propoxylated trimethylol propane were studied from the analysis of degradation gases sampled at various temperatures during the heating rise. From the beginning of degradation (250°C) to 400°C, we suggest that the main mechanism is the fract…