Materials Literature
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SiTiO 3 capacitor material with indiffused Bi 2 O 3 was studied using SEM, ESCA combined with Ar + ion‐etching, and TEM equipped with EDX. The apparent thickness of a second‐phase layer observed with SEM was found to be influenced by in‐depth effects. ESCA and TEM results show that only a 10‐ to 100‐nm thick layer of…
A major collagenous component of octopus skin was isolated from limited pepsin digests by selective salt precipitation in acidic and neutral solvents. Chromatography on Cm-cellulose of the denatured collagen and sodium dodecyl sulfate-gel electrophoresis, agarose gel filtration, and chemical analysis of the chromatogr…
We report on an extensive study of the frequency and temperature dependent conductivity of largely cis- (CH)x trans- (CH)x, and NH3 compensated and iodine doped materials. The results reveal a strongly temperature (T) dependent dc conductivity and weakly T-dependent ac conductivity for largely cis- (CH)x and for NH3 c…
Na 2 O–3SiO 2 glasses with up to ≅12 wt% water were prepared under high‐pressure, hydrothermal conditions and their electrical conductivities were measured. The conductivity (σ) was found to depend on H 2 O content in a manner similar to the “mixed‐alkali” effect. At constant temperature, σ decreased initially with in…
This part of the paper focuses on the application of the analytical model developed in Part 1 on the uniaxial tension, uniaxial compression, and plane problems (including rotating strain fields and unproportional loading). Identification of the material parameters is discussed in view of the derived results.
The circumstances under which EDX microanalysis can yield serious errors as a function of the crystallographic orientation are discussed. It is shown that such errors can be as high as 50° when examining a fully ordered alloy or compound. Experimental results obtained on CuPt are correlated with a theoretical treatmen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental evidence for the absence of bonding electron density between inverted carbon atomsPinakpani Chakrabarti, Paul Seiler, Jack D. Dunitz, Arnulf Dieter Schluter, and Guenter SzeimiesCite this: J. Am. Chem. Soc. 1981, 103, 24, 7378–7380Publication Date (Print):Decemb…
Abstract An improved method for the determination of pyridoxal‐5‐phosphate using tyrosine decarboxylase is described.
Ultrafine powder of single‐phase manoclinic ZrO 2 was prepared by hydrothermal treatments of amorphous hydrated zirconia with 8 wt% KF solution under 100 MPa at 200° to 500°C for 24 h. The process yielded well‐crystallized particles 16 nm and 22 nm in size at 200° and 500°C, respectively .
The technique of small angle x-ray scattering has been employed to study the effect of sugars on the radius of gyration of the L-arabinose-binding protein, a component of the high affinity L-arabinose transport system in Escherichia coli. We find that the binding of L-arabinose to the "sugar-free" protein in solution…
The crystallization characteristics of two commercial calcium aluminate glasses have been studied using scanning electron microscopy. In particular it is demonstrated how atomic number contrast can be used to identify rapidly crystalline phases without the need for etching and the related loss of compositional and mor…
The title reagent K/SiO 2 has a greater reactivity and a different selectivity compared to metallic potassium . It is particularly suitable for dimerizations: benzophenone can be converted with K/SiO 2 into benzopinacol in 72% yield; bromo‐ and iodobenzene afford biphenyl in yields of more than 80%.
Abstract The crystals are triclinic, P\bar1. R is 0.047 for 1617 independent non-zero reflections. The complex has a centrosymmetric square-planar coordination, with two imino nitrogen and two bromine atoms in trans positions.
Abstract Gas chromatography using a column with a molecular sieve was applied to the determination of carbon monoxide in thermal degradation of polymeric materials. Attention was paid to the variance of individual determinations and conclusions were drawn regarding reproducibility of the processes studies. The carbon…
Experimental and theoretical studies of the propagation of surface magnetoelastic waves at the spin reorientation of TmFeO3 are presented. It was found that surface waves propagating on the (a-b) surface and along the a axis of the orthorhombic crystal, exhibit velocity dips ΔV/V02.5% at the transition temperatures of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular systematics in metal tetrathiolenes. A novel 2-, 4-, 6-, 8-, and 12-electron-donating ligand system upon coordination to one, two, two, three and four metals, respectivelyBoon Keng Teo and P. A. Snyder-RobinsonCite this: Inorg. Chem. 1981, 20, 12, 4235–4239Publicat…
Abstract Dimethylsulphoxide (DMSO)‐hydrogen chloride interactions have been studied by means of Raman and infrared spectroscopy both in solid 1:1 adducts and in liquid mixtures with DMSO:HCl molar ratios >2. The deuterated analogue solid 1:1 (DMSO‐ d 6 )‐DCl was also prepared and studied. Vibrational data suggest t…
Air permeabilities for two woven fabric constructions having common warps but different filling yarns were measured. The filling yarns were produced by ring spinning, open-end spinning, core-wrapping with filament, and a no-twist process. Comparison of air permeabilities of the woven fabrics were made in the gray and…
Abstract Cs3(AuBr 4 ) 2 Br 3 is obtained in the form of red needles by adding the stoichiometric amount of CsBr to a solution of HAuBr 4 and Br 3 - in aqueous HBr. The salt decomposes slowly at room temperature to form a mixed-valent, cubic bromo aurate(I,III), in which the linear AuBr 2 - ions are partially substitut…
Abstract The technical properties and the network structure of carboxylated nitrile rubber (XNBR) having a mixed crosslink system of sulfur and metal carboxylate have been studied. XNBR of different carboxyl contents (Krynac 221, Krynac 110C), yielding different concentrations of ionic crosslinks, have been used for t…