Materials Literature
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The structure and mechanism of formation of a novel hexagonal mesostructured vanadium oxide−surfactant composite (HMVO), synthesized by acid-catalyzed hydrolysis of ethanolic cetyltrimethylammonium vanadate (CTAV) solution, has been studied by a variety of spectroscopic techniques. The poorly crystalline CTAV precurso…
The temperature dependence of the NO 2 + NO 3 + (M) ↔ N 2 O 5 + (M) equilibrium has been studied in the temperature range 279.6−294.2 K at a total pressure of 1000 mbar synthetic air in the 200 m 3 EUPHORE simulation chamber facility in Valencia, Spain. Simultaneous determination of the concentration−time behaviors of…
Rapidly solidified magnesium alloys with 8 at%, 15 at%, and 20 at% Al and 1 at% and 3 at% Zn were fabricated by centrifugal atomization followed by hot extrusion. Microstructure of the alloys was composed of a fine-grain magnesium matrix (0.5 μm) with β-Mg17Al12 precipitates. Electrochemical and weight-loss tests were…
The structure stability of perovskite‐type compounds has been quantitatively estimated by applying bond valence calculations to Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) and Pb(Zn 1/3 Nb 2/3 )O 3 (PZN). The bond valence calculations revealed that the bond strength between oxygen and cations in the pyrochlore‐type compounds is great…
Reaction of the first and second generations of monodendrons, bearing peripheral 2,2‘:6‘,2‘‘-terpyridine units (tpy) and focal point benzylic bromine, with phosphine-substituted silsesquioxane Si8O12(CH2CH2PPh2)8 in refluxing THF affords the corresponding dendritic macromolecules with encapsulated polyhedral silsesqui…
Charged organic−aqueous interface electrostatics are assessed in order to clarify potential electrostatic contributions to oriented mineral nucleation at planar organic surfaces. Fatty acid and acidic phospholipid monolayers contacting aqueous solutions of sparingly soluble salts serve as model systems. Monolayer elec…
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…