Materials Literature
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Abstract The kinetics and equilibria of SO 2 sorption in Kapton polyimide film have been studied at temperatures from 25 to 55°C and equilibrium sorption pressures up to 0.76 atm. The data are described well by the dual‐mode model of sorption and transport in glassy polymers. The assumption of “partial immobilization”…
Analysis of a model free energy shows that three distinct commensurate phases can exist in a layer of a material having the $2H$-Ta${\mathrm{Se}}_{2}$ structure. Recent experimental results show that two of these phases occur in $2H$-Ta${\mathrm{Se}}_{2}$, with a transition between them at a temperature between 30 and…
The microstructure observed in a Cu-Ni alloy fatigued in multiple glide consists of two sets of similar dipolar walls parallel to two different {100} planes. These are spaced approximately 0.5 μm apart within each set but are arranged in a non-random manner in that L-joints and T-joints among the walls are much more f…
The diagrams of state of 11 binary systems are presented which form EDA Complexes in the liquid dcrystalline state. The influence of the molecular length and the complex stability on the formation of enhanced smectic A phases have been studied.
A variety of homologs of 4-alkylbenzenethio-4′-alkyl or alkoxybenzoates in which the 4′-alkoxy group is C7-C14, the 4′-alkyl group is C7-C12 and the 4-alkyl group is C5-C8 or C10 were prepared and their mesomorphic properties studied by microscopy, DSC and X-ray diffraction. A comparison is made of the mesomorphic pro…
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…