Materials Literature
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The synthesis and liquid crystalline properties of unsymmetrically substituted Pcs which contain both alkyl and hydroxy terminated tetra(ethyleneoxy) side-chains are described. Despite poor Langmuir-Blodgett film forming properties, the amphiphilic Pcs are of interest as they display a variety of columnar mesophases a…
In the snake, Elaphe quadrivirgata, the occurrence of amelogenin was immunohistochemically demonstrated in the enamel of developing tooth germs. Teeth of the snake are covered with a thin true enamel layer about 1-2 microns in thickness. Light and electron microscopic immunohistochemistry indicated an intense amelogen…
Two magnesium hydroxide fillers of different morphology, but almost identical surface area, were incorporated into polypropylene to assess their nucleation properties. The platelet filler was found to reside parallel to the flow direction, whereas the pseudospherical filler resided isotropically within the matrix. The…
The structural elucidation of six new related polyoxypregnane glycosides, gymnepregosides A (1), B (2), C (3), D (4), E (5) and F (6), together with two known compounds, from the roots of Gymnema alternifolium (Asclepiadaceae) was achieved through on a detailed study of 1H- and 13C-NMR spectral data and chemical means…
X-ray acid neutron powder diffraction studies have been made on phase-pure LiNixMn2-xO4 (x = 0, 0.04, 0.18 and 0.33) substituted materials solely to establish how Ni substitutes into the spinel structure. Rietveld refinement showed all the materials to ha
A novel layered indium sulfide inorganic/organic composite material has been synthesized under solvothermal conditions and characterized via single crystal X-ray diffraction.
The continuing trend toward miniaturization of integrated circuits is driving the development of low dielectric constant materials (k<3) and their integration with copper metallization. In this work, the interface formed between copper or titanium and low dielectric constant polymer was explored. Fluorinated po…
Carbon nanocapsules with SiC nanoparticles were produced by thermal decomposition of polyvinyl alcohol with SiC clusters at 500 °C in Ar gas atmosphere. High-resolution electron microscopy also showed the formation of carbon hollow structures such as nanoparticles, polyhedra, and clusters. The present work indicates t…
In this study the use of three different types of aminosilanes for crosslinking plasticized PVC was investigated. The processing techniques used were milling, followed by press molding and extrusion. The processing conditions were carefully adjusted to minimize premature crosslinking. Crosslinking was carried out by i…
Hexacoordinate silicon compounds and polymers with the tetradentate azomethine ligand N,N′-ethylenebis(2-hydroxyacetophenoneiminate) (H2salen*) have been prepared and characterized; the X-ray structure analysis of (salen*)SiF2 clearly demonstrates the octahedral coordination of the silicon atom.
PVA is a highly effective and versatile formulating tool because of its solution stability, its compatibility with many common formulation ingredients and its wide range of grades.
In this paper, a dynamic (time and temperature dependent) Preisach model is described. In the Preisach plane one uses a double well potential distribution calculated with the Stoner-Wohlfarth model. Both static and dynamic interactions for a ultrafine particulate system are taken into account in order to simulate vari…
Time-of-flight secondary ion mass spectrometry (TOF SIMS) analyses have been performed on MoO3–Pr6O11 mixtures before and after their use in the selective oxidation of isobutene to methacrolein at 673 K. The three pure molybdate phases (Pr2MoO6, Pr2Mo3O12, Pr6MoO12) obtained independently by the citrate route have als…
The bidentate phosphine ligands bis(diphenylphosphino)acetylene and 1,4-bis(diphenylphosphino)benzene have been found effectively to stabilise polynuclear copper/chalcogenide/chalcogenolate cores, acting as intramolecular bridges between copper centres. The clusters [Cu16Se4(SePh)8(µ-1,4-Ph2PC6H4PPh2)4] 1 and [Cu25Te6…
Electrochemical impedance spectroscopy was used to probe the mechanism of copper deposition on silicon from dilute hydrofluoric acid solutions. Reaction parameters such as polarization resistance and space‐charge capacitance were evaluated using an equivalent circuit model. The electrochemical impedance technique was…
Kinetic models for the thermal degradation of poly(vinylbutyral) PVB/Al 2 O 3 and PVB/AlN composites, based on weight loss and evolved gas analysis (EGA), are presented. TG (sample weight loss) and FT-IR (mixture gas spectra) data were measured to elucidate the kinetic models using isothermal and nonisothermal approac…
Polymers containing labile silyl ester bonds along the backbone were synthesized via a transsilylation ester interchange reaction. The condensation of the bis(trimethylsilyl) esters of adipic acid and sebacic acid with several bis(silyl chloride)s gave trimethylsilyl chloride as the condensate and formed the new silyl…
Article Selective Transition-Metal Catalysis of Oxygen Delignification Using Water-Soluble Salts of Polyoxometalate (POM) Anions. Part I. Chemical Principles and Process Concepts was published on January 1, 1998 in the journal Holzforschung (volume 52, issue 3).
The mechanism of the partial oxidation of CH 4 was studied by a transient response analysis of a broadened pulse combined with either a step change or a sharp isotopic pulse. Over the unreduced NiO/SiO 2 catalyst, the reaction between CH 4 and O 2 occurs via the Eley−Rideal mechanism, CH 4 in the gas phase (or weakly…
We present a theoretical analysis of the influence of ambient pressure on single-bubble sonoluminescence (SBSL). By combining simulations of gas dynamics, mass diffusion theory, and stability analysis we find a narrow region of the parameter space where stable SBSL is possible. In particular, the theory predicts a 200…