Materials Literature
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The microstructure of thin films applied by conventional physical vapor deposition for use as optical coatings is columnar for most of the materials commonly used. This has been established for about a decade through numerous experimental observations employing microfractographical replication for use with high resolu…
The organic matrix of calcium carbonate structures can be involved in the formation of the biomineral by regulating various stages of crystal growth. The preponderance of evidence suggests that matrix can act as an initiator of crystal growth at the mineralizing front. The mechanism for this initiation is not known. H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels of the cytochromes b. 5. EPR studies of low-spin iron(III) tetraphenylporphyrinsF. Ann Walker, David Reis, and Virginia L. BalkeCite this: J. Am. Chem. Soc. 1984, 106, 23, 6888–6898Publication Date (Print):November 1, 1984Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels of oxidized heme proteins. Preparation and characterization of a trans-dioxoruthenium(VI) porphyrin complexJohn T. Groves and Robert QuinnCite this: Inorg. Chem. 1984, 23, 24, 3844–3846Publication Date (Print):November 1, 1984Publication History Published online1 May…
Boehmite sol‐gels were seeded by adding <2.0 wt%α‐alumina powder to a 20% boehmite hydrosol at pH =3. The seeded gel sintered to 98% of theoretical density after 100 min at 1200°C, whereas the unseeded gel had to be sintered at 1600°C to reach 94% of theoretical density. This difference results primarily from nucle…
Abstract Die Darstellung und Strukturuntersuchung von Sr 3 Fe 2 O 5 Cl 2 wird beschrieben. Diese Verbindung gehört zum Sr 3 Ti 2 O 7 ‐Typ mit a = 3,942(2) und c = 23,786(12) Å; Raumgruppe D −I4/mmm. Sr 3 Fe 2 O 5 Cl 2 besitzt einseitig gestreckte FeO 5 Cl‐Oktaeder, die in bezug zu anderen K 2 NiF 4 ‐Strukturen diskuti…
Si, Ge and Sn have been studied by energy dispersive X-ray diffraction up to 50 GPa. Si shows first the well known transition from diamond to β-tin structure around 11 GPa. It transforms to a primitive hexagonal structure (Si-V) around 15 GPa, to an intermediate phase Si-VI around 35 GPa and finally to hcp (Si-VII) ar…
Non-geometric high dielectric constant stress relef has been used successfully since the 1960' s for terminating shielded power cable primarily in tape form. Unique problems occurred when adapting the early tape form of this technology to formulate high dielectric constant elastomers which could be molded or extruded.…
Abstract In an attempt to compare the relative reactivities of different redox systems in graft copolymerization of vinyl monomers onto cellulose, we studied grafting of ethylacrylate (EA) in aqueous medium by using the well‐known redox intiator, ferrous ammonium sulfate–potassium persulfate (FAS–KPS) system, and its…
A promising new ion‐conducting material , the title compound, can be prepared from AgMnO 4 and Ag 2 O (1:1) at 970 °C under 5 kbar O 2 . The Mn 8 O 16 framework forms channel‐like cavities of face‐sharing cubes. The Ag ⊕ ions occupy the bottle‐necks of this one‐dimensional diffusion channel as regular lattice sites. T…
Abstract Bimodal elastomeric networks were synthesized by tetrafunctionally end‐linking very short and relatively long hydroxyl‐terminated chains of poly(dimethylsiloxane). Decrease in the molecular weight of the short chains (from 880 to 660 to 460 g mol −1 ) generally results in significant increases in ultimate str…
Abstract The finding that dispersions of insulators such as alumina or silica in ionic conductors may exhibit considerably enhanced ionic conductivities compared to the pure material, has become a promising topic for optimizing the electric properties in solid state research. Up to now the basic mechanism for this eff…
The binding of metal ions from salts and from corrosion products of 316 LVM stainless steel and MP-35 to blood cells and serum proteins was studied in vitro. In the first series of experiments, metal salts were added to whole blood and then the blood separated into red cells, white cells, and serum. Nickel from nickel…
Tensile experiments on polypropylene and various rubber-modified polypropylenes, conducted over a wide range of temperatures and strain rates, have shown that the ductile–brittle transition in these highly crystalline polymers is strongly affected by both temperature and strain rate. Such polymers can either craze or…
The neutron powder profile refinement technique has been used to determine the crystal structure of solid Br2 at 5, 80, 170 and 250 K and that of solid Cl2 at 22, 55, 100 and 160 K. The results confirm that the structures of the two halogens are isomorphous, with space group Cmca at all temperatures. For both halogens…
In this paper we show that although in one dimension multiplicity of solutions to the phase reconstruction problem presents a serious problem, in two or more dimensions multiplicity is pathologically rare. We derive from a given solution pair (g,G) necessary conditions for the existence of alternative solution pairs (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA formulation of the short-range repulsion between spherical colloidal particlesDonald L. Feke, Naresh D. Prabhu, J. Adin Mann Jr., and J. Adin Mann IIICite this: J. Phys. Chem. 1984, 88, 23, 5735–5739Publication Date (Print):November 1, 1984Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectroscopic study of the interlamellar kaolinite-dimethyl sulfoxide complexClifford T. Johnston, Garrison Sposito, David F. Bocian, and Robert R. BirgeCite this: J. Phys. Chem. 1984, 88, 24, 5959–5964Publication Date (Print):November 1, 1984Publication History…
This review describes the utilisation of synchrotron X-radiation (SR) in protein crystallography. For the general reader a brief discussion is given of the basics of protein structure analysis including an outline of the problems of sample radiation damage, the inherent weakness of individual reflections and the large…
Complex anisotropic media can generally be described by a6 \times 6macroscopic constitutive tensor\hat{C}. Using\hat{C}properties, a reaction integral formula is derived from which an anisotropic reaction theorem (modified reciprocity theorem) is developed. Reduction of the\hat{C}medium into a reciprocal medium is dis…