Materials Literature
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Abstract A systematic analysis of the IR and Raman spectra of dipotassium tartrate hemihydrate (K 2 C 4 H 4 O 6 · ½H 2 O) in terms of the standard frequency correlations, deuteration shift and typical nature (with respect to intensity and width) of bands due to different modes is reported. The bands due to the interna…
Abstract Holtite, (Si 2.25 Sb 0.75 )B[Al 6 (Al 0.43 Ta 0.27 □ 0.30 )O 15 (O,OH) 2.25 ], is orthorhombic a = 4.6914(5), b = 11.896(2), c = 20.383(4)Å, space group Pnma . Full-matrix least-squares refinement yielded a final R = 0.030, for 1664 reflections with I ⩾ 3σ(I). Its crystal structure is closely related to that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComment on the thermal decomposition of anisole and the heat of formation of the phenoxy radicalM. H. BackCite this: J. Phys. Chem. 1989, 93, 18, 6880–6881Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 19…
Methanation of a 9/1 mixture of H2/CO at 180°C has been studied by transient techniques in a gradientless microreactor, The use of isotopic techniques and temperature programmed reduction (TPR) made possible the measurement of adsorbed CO, of a reactive carbon Cα and of an inactive carbon Cβ. As little as 0.04-0.06 mo…
This reproduction was made from a copy of a document sent to us for microfilming.While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted.The following explanation of techniques is provide…
In this study the corrosion behavior of porous type(1) 316L stainless steel has been evaluated and compared to that of conventionally made wrought stainless steel. The corrosion behavior of this porous material was investigated by potentiodynamic anodic polarization, open-circuit potential measurements, and identifica…
Type I collagen purified from calf skin was further separated into monomeric and oligomeric fractions and characterized with gel electrophoresis and measurement of solution viscosity. The thermal stabilities of the triple-helical structure of the collagen molecules of these preparations and the fibrils assembled there…
By modifying 13Cr–4Mn (wt-%) white cast iron with boron and rare earth (RE)–Si complex, the carbide morphology of the iron can be changed from interconnected, coarse clusters of rods into a parallel distribution of isolated, fine rods, and the impact toughness of the iron can reach 6–7 × 104 J m−2. In a pin wear test,…
The electrochemical, spectroscopic, and structural properties of passive layers on Ni(100) grown either electrochemically in aqueous 10 m M HClO 4 or by dosing with gaseous oxygen in ultrahigh vacuum (UHV) were compared using a UHV‐electrochemical transfer system equipped for x‐ray photoemission spectroscopy (XPS), lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear viscosity of liquid sulfur near the polymerization temperatureJ. Ruiz-Garcia, E. M. Anderson, and S. C. GreerCite this: J. Phys. Chem. 1989, 93, 19, 6980–6983Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Sep…
The initiation and propagation of stress corrosion cracking (SCC) of high alloys in sour gas environments were investigated mainly from the viewpoint of cathodic reactions. The most probable cathodic reaction to support the metal dissolution in the pitting and/or cracking process was identified by means of electrochem…
Ethylenediamine, triethylenetetramine, 1,4‐bis(3‐aminopropyl)piperazine, and poly(ethylenimine) were individually chemisorbed onto an iron substrate. Chemisorption proceeded without new bands appearing in either the iron or oxygen photoelectron spectra, without the surface iron atoms being oxidized, and without either…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and solution properties of extended chain poly(2,6-benzothiazole) and poly(2,5-benzoxazole)Andrea W. Chow, Steven P. Bitler, Paul E. Penwell, Dyan J. Osborne, and James F. WolfeCite this: Macromolecules 1989, 22, 9, 3514–3520Publication Date (Print):September 1, 19…
Abstract This paper discusses polymers for optoelectronics, especially plastic optical fibers (POFs) for near‐infrared (near‐IR) use and polymeric nonlinear optical materials expected for use as switching devices. Near‐IR transmissible plastic optical fibers are investigated using fluorination and deuteration for conv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight effects on the liquid-crystalline properties of poly(vinyl ether)s with pendant cyanobiphenyl mesogenic groupsToshihiro Sagane and Robert W. LenzCite this: Macromolecules 1989, 22, 9, 3763–3767Publication Date (Print):September 1, 1989Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhanced Raman scattering from liquid metal films formed from silver solsKeith C. Gordon, John J. McGarvey, and K. Paul TaylorCite this: J. Phys. Chem. 1989, 93, 18, 6814–6817Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published in…
The carbon additions in the pressureless sintering of SiC are commonly used for the removal of SiO 2 layers on the starting powders. In practice, it is common to add more C than is necessary for stoichiometric removal to ensure a complete deoxidation. As a result, inclusions of excess free C are a general feature of t…
Smectic isotactic polypropylene films were annealed at different temperatures for different times. Density, wide-angle x-ray scattering (WAXS), differential scanning calorimetry, and the transport properties of methylene chloride vapor were used to follow the transformation of the smectic phase into the monoclinic pha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel coordination mode for oxygen: preparation and properties of (NBun4)2[V4O(edt)2Cl8] containing a square planar oxide bridgeJoe R. Rambo, John C. Huffman, Odile Eisenstein, and George ChristouCite this: J. Am. Chem. Soc. 1989, 111, 20, 8027–8029Publication Date (Print)…
Fine SiC powders were synthesized by burning the mixed reactionts Si and C in a nitrogen atmosphere of 3 to 10 MPa. The exothermic synthesis reaction propagated spontaneously after igniting the reactants at room temperature. The SiC powders obtained had a uniform size distribution of about 0.2 μm. The combustion veloc…