Materials Literature
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We have investigated the carbon-13 solution nuclear magnetic resonance (NMR) chemical shifts of C α, C β, and C γ carbons of 19 valine residues in a vertebrate calmodulin, a nuclease from Staphylococcus aureus, and a ubiquitin. Using empirical chemical shift surfaces to predict C α, C β shifts from known, X-ray φ,ψ va…
A polymer blend consisting of polyimide (PI) and polyurethane (PU) was prepared by means of a novel approach. PU prepolymer was prepared by the reaction of polyester polyol and 2,4-tolylenediisocyanate (2,4-TDI) and then end-capped with phenol. Poly(amide acid) was prepared from pyromellitic dianhydride (PMDA) and oxy…
Nanostructured carbon thin films have been produced by deposition of supersonic cluster beams. The clusters are generated by a pulsed arc cluster ion source modified in order to achieve high fluxes and stability. Scanning electron microscopy, Raman, and optical spectroscopy show that the films are a low density networ…
The photoionization of meso -tetraphenylporphyrin (H 2 TPP) within mesoporous MCM-41 silica tube molecular sieves is studied with visible light irradiation at room temperature and 77 K. Porphyrin π-cation radicals (H 2 TPP •+ ) are generated by photoionization within MCM-41 molecular sieves and are characterized by el…
A dramatic variation of the magnetic coupling in large polyiron clusters can be induced by exploiting host−guest interactions. Subtle structural changes and much weaker antiferromagnetic interactions are the result of the substitution of Na+ with Li+ in the hollow core of the cyclic complex [Fe6(OCH3)12(dbm)6] (Hdbm =…
Optically transparent mesoporous silica plates, which are crack-free up to centimeters in size and 0.5 mm in thickness, have been synthesized using a sol−gel process based on the self-organization between surfactant and silicate through the van der Waals-type, weak, multiple, nonbonded interaction in nonaqueous solven…
The results of first principles calculations using AIMPRO (a local-density-functional code) are presented to describe the stability of interstitial Si in diamond. It is found that the 〈100〉 and 〈11 ...
A qualitative explanation is given for the effect wherein red blood cells are oriented in a nonlinear liquid-crystal medium, and it is shown that it is different from the Fröhlich interaction for living biological systems.
Current fluctuations during general corrosion of stainless steel in sulfuric acid (H2SO4) were studied experimentally and analyzed using a simple electrochemical model. Stochastic behavior of the metal-electrolyte interface in the model was based upon the assumption that elementary fluctuation sources were related to…
Reaction couples of either ((Bi,Pb)-2212) single crystals with `' powder or (Bi-2212) single crystals with `' powder were used to study the formation reaction of (Bi,Pb)-2223. The samples were annealed between and , in air, for 65 h. Microstructural observations were made of the different geometrical interfaces. No (B…
The field-dependencies of the ME-effect and longitudinal magnetostriction of single crystals GaxFe2-xO3 in magnetic fields up to 200 kOe have been studied. For analysis of the experimental data the representation about toroidal spin ordering has been used, which is in qualitative conformity with the experimental data.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChain Conformation of Cellulose in a Coordinating SolventO. Hanemann and M. BallauffView Author Information Polymer-Institut, Universität Karlsruhe, Kaiserstrasse 12, 76128 Karlsruhe, Germany Cite this: Macromolecules 1997, 30, 24,…
The morphology of ternary polypropylene (PP)-polyamine-6 (PA-6) glass (either beads [GB] or fibers [GF]) blends was investigated as a specific example of a multicomponent system. The implications of blend structure and filler partitioning on several properties, such as viscosity and crystallization behavior, are discu…
A new semi-empirical model for predicting the ferrite content of stainless steel welds has been developed. This model predicts the ferrite number of stainless steel welds as a function of composition. The model is based on an equation representing the free energy change between ferrite and austenite. This model has be…
Abstract Accessory green ferric clay occurs in fluvial litharenites of the Early Triassic Rewan Group. Although resembling glauconitic minerals in thin-section, electron microprobe analyses indicate that the green ferric clay is mainly ferric illite. The ferric illite may have formed in a small hypersaline lake or wel…
The electron beam assisted chemical etching (EBACE) method with hydrogen gas is applicable to direct fine patterning of single-crystal diamond substrates. A scanning electron microscope (SEM) combined with a gas introduction system was used for EBACE. Hole, line and rectangular patterns were successfully fabricated. I…
Mullite (3Al 2 O 3 ·2SiO 2 ) coatings on SiC substrates and SiC precoated carbon/carbon composite (C/C‐Si‐SiC) substrates were produced by pulsed laser deposition (PLD) using pressed mullite powder targets. The layers can be characterized efficiently by IR reflection spectroscopy in the spectral range between 650 and…
Experimental heat capacity, dielectric, and shear spectroscopy data are reported on the αβ splitting region of poly( n -octyl methacrylate). New facets of a major difference between the high-temperature a relaxation at frequencies above the αβ splitting region and the ordinary α relaxation below are obtained: An α coo…
An observation of diamond nanocrystal nucleation in the course of hydrogenated amorphous carbon film growth under ion sputtering of graphite is reported. Transmission electron microscopy (TEM) (100 keV), selected-area electron diffraction and optical absorption (1–6 eV) studies of the prepared hydrogenated amorphous c…
In this work, the authors derive the weighting functions of the Preisach model of hysteresis (used for real-time control applications) corresponding to the uniaxial isothermal psuedoelastic response of an SMA polycrystal. A uniform distribution of single crystals is taken to constitute the polycrystal. The assumed pha…