Materials Literature
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Strontium barium niobate, Sr0.6Ba0.4Nb2O6 (SBN40) ceramics were prepared by the mixed oxide route; specimens sintered at 1300 °C–1450 °C for 2–4 h had densities of ∼95% theoretical. The use of “conventional’’ conditions (1300 °C; ∼200 °C below the melting temperature) gave rise to a duplex structure comprising a mixtu…
New dendritic metallophthalocyanines are prepared on the basis of Newkome’s divergent-growth approach; the number of generations within the dendrimer is found to affect the aggregation behaviour of the zinc(II) phthalocyanine moiety which forms the interior core of the dendrimers.
New hydrotalcite-like anionic clays containing Zr4+ in the brucite-like layers are synthesised by a simple coprecipitation technique; these materials show very interesting properties as catalysts for liquid-phase hydroxylation of phenol with H2O2.
The effect of melting behaviour on upward flame spread of thermoplastic materials when subjected to small ignition sources and considered to suffer no external flux was studied using large-scale tests. For moderate fire conditions the cone calorimeter was utilized, with the sample set in a vertical orientation to stud…
Layered double hydroxides (LDHs) containing Mg 2+, Al 3+, and Y 3+ in the brucite-like layers and with carbonate as counteranion have been prepared following the coprecipitation method at constant pH. The Al/Y ratio depends on the concentrations in the starting solutions. The crystallinity of the layered materials dec…
Various methods of characterizing insulating materials by their ability to take up charge, retain it, and release it, are reviewed critically in search of measurable quantities that could be used to predict material behavior under stress up to failure conditions. Space charge characterization data on different types o…
We used the mouse air pouch model of inflammation to study the interaction between cytokines, prostaglandin E(2) (PGE(2)) and cell migration during the various phases of acute local inflammation induced by carrageenan. In serum, the levels of interleukin 1 (IL-1), interleukin 6 (IL-6), tumour necrosis factor (TNF), se…
Colloidal gold nanoparticles in toluene solution, synthesised using a two-phase liquid/liquid system, display second harmonic generation, wavelength analysis of which indicates the narrow frequency band of the gold surface plasmon for nanoparticles present at the air/toluene interface.
Diffuse reflectance Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning Auger microscopy, elemental analyses, BET surface area, and thermogravimetric analyses have been used to study metals and adsorbed organics on the surface of metal-loaded activated carbon materials. Metals such as c…
The SAE Fatigue Design Handbook covers, in a single source, current technologies and procedures on all of the major elements of fatigue design. Intended as a handbook for industrial use, this book describes the major elements of the fatigue design process and how those elements must be tied together in a comprehensive…
The attachment of high‐quality amorphous diamond (a‐D) coatings has been studied with respect to the hardness of the underlying layer. A novel intermediate‐layer technique is reported that enables thick a‐D coatings to be deposited successfully on all solids at room temperature. The Figure shows an a‐D film, on a 1.2…
This paper demonstrates the synthesis and characterization of poly(ether imide)s with ortho -linked main-chain units based on the bis(ether anhydride)s derived from catechol and 2,3-dihydroxynaphthalene. The polymerization was conducted in two steps via the formation of a poly(amic acid) precursor followed by thermal…
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The third order nonlinear optical susceptibilities X (3) of PbO-Bi 2 O 3 -B 2 O 3 glasses have been measured by the third harmonic generation (THG) method The borate network structure in the present glass system has also been investigated by using Raman and 11 B MAS NMR spectroscopies. The coordination state and the b…
Although the glycosidic fraction from the dried leaves of Gymnema sylvestre R. BR., gymnemic acid, was reported to be effective for diabetes, it showed little inhibitory activity on the increase of serum glucose level in oral glucose-loaded rats. From the glycosidic fraction, six triterpene glycosides, gymnemosides a,…
The short and long-term dielectric behavior of a number of representative electrical insulating systems is compared in the presence of space charge. Dielectric materials, used both in the communications and power application areas, are considered. In this overview, particular attention is given to thin inorganic films…
A new type of polymer–silica composite based on aramids of either linear or non-linear structure has been prepared successfullyvia the sol–gel process. The linear polyamide chains were prepared by the reaction of a mixture of m-phenylene and p-phenylene diamines and terephthaloyl chloride in dimethylacetamide. The non…
The complexes [Ag(AsPh 3 ) 4 ]BF 4 and [Au(AsPh 3 ) 4 ]BF 4 were prepared from AgBF 4 and 4 equivalents of AsPh 3 , and from equimolar quantities of [Au(AsPh 3 )Cl] and AgBF 4 and 3 equivalents of AsPh 3 , respectively, in dichloromethane solution. Single crystals of the two compounds are isomorphous (trigonal, space…
Zinc porphyrins have been widely used as surrogates for chlorophyll (which contains magnesium) in photosynthetic model systems and molecular photonic devices. In order to compare the photodynamic behaviour of Mg- and Zn-porphyrins, dimeric and star-shaped pentameric arrays comprised of free-base (Fb) and Mg- or Zn-por…
In this study, we attempted to prepare microspheres from a microbial biodegradable polyester, i.e. polyhydroxybutyrate (PHB) as a potential chemoembolization agent. The drug loaded PHB microspheres were prepared by a solvent evaporation technique, in which methylene chloride, distilled water, and polyvinyl alcohol wer…