Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExploring the Limits of the Zintl Concept for the A14MPn11 Structure Type with M = Zn, CdDianna M. Young, Charles C. Torardi, Marilyn M. Olmstead, and Susan M. KauzlarichCite this: Chem. Mater. 1995, 7, 1, 93–101Publication Date (Print):January 1, 1995Publication History Pub…
A cyclic trimeric porphyrin host has been synthesised with alkyne–platinum–alkyne linkages; binding of the octahedral aluminium tris[3-(4-pyridyl)acetylacetonate] guest ligand into the complementary cavity of the host induces an asymmetry which is readily detected by NMR spectroscopy. The ligand complementarity unambi…
Syntheses are described for two octatetrayne-linked cyclic porphyrin oligomers with extremely spacious cavities. These hosts bind strongly to complementary multidentate guests. Thus, the octatetrayne-linked dimer binds bifunctional ligand bis(4-pyridyl)ethyne with an affinity of 7 × 106 dm3 mol–1, and the trimer binds…
Lanthanide(III) complexes of a novel heptadentate chelating ligand display structural and dynamic properties that are particularly interesting in view of potential applications in magnetic resonance imaging (MRI).
A new theory is presented to predict the tensile behaviour of spun-bonded nonwoven fabrics from the knowledge of the stress–strain behaviour of its constituent fibers, their orientation angle distribution, the fabric's Poisson's ratio and their shear strains. A comparison of the predicted stress–strain curves and expe…
When an amorphous Fe90Nd7B3 alloy subjected to annealing for 60 to 180 s at temperatures between 923 and 1023 K consists of a mixed structure of bcc-Fe, Fe3B, Fe14Nd2B and remaining amorphous phases, the (BH)max and remanence were found to have maximum values of 113 kJ/m3 and 1.17 T, respectively. Their crystallites w…
Statistical data analysis has been recently requisite for partial discharge (PD) study. This has been enabled by the recent development of microprocessors or the downsizing of computers. It is important to pay more attention to profiles of a packet of PD pulses on the voltage phase angle. Statistical parameters such a…
The transmission line modelling method and the Preisach theory are employed to model and simulate the hysteresis effects of magnetic cores. This combined approach provides a useful method, which allows fast and accurate prediction of magnetic core losses, and simple software implementation of the dynamic discrete mode…
The use of high-dielectric films for microwave devices, especially phased-array radar systems, in the tens of GHz regime requires very low-loss (0.01 to 0.1) films. Unfortunately most ferroelectrics have losses that diverge (greater than unity) in this frequency range. We develop in the present study quantitative mode…
Hydroperoxide groups are widely believed to be critical intermediates in the oxidative degradation of many polymers, especially commodity polyolefins [34, 5 1-53]. Trace amounts of hydroperoxides in polyolefins such as polyethylene (PE) may be formed inadvertently during polymerization and processing. It is found that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrain-Induced Crystallization in Poly[methyl(3,3,3-trifluoropropyl)siloxane] NetworksKevin P. Battjes, Chung-Mien Kuo, Robert L. Miller, and John C. SaamCite this: Macromolecules 1995, 28, 3, 790–792Publication Date (Print):January 1, 1995Publication History Published onlin…
Chopped culms of bamboo grass were treated with saturated steam over a range of temperatures and residence times. The effect of various parameters in the steaming treatment on the recovery yield and solubilization of xylan was investigated. The parameters included steaming temperature, residence time, initial moisture…
The pulsed electroacoustic (PEA) method is widely known to be an excellent method for the measurement of the space charge distribution which accumulates in thick dielectric materials (1-5mm). However, because of its lower resolution in the depth direction, conventional application of this method is less suitable for t…
Rod-like complexes [AuCl(CNC6H4C6H4OCnH2n+1-p)](n= 4, 6, 8, 10, 12) have been prepared by reaction of [AuCl(tht)](tht= tetrahydrothiophene) with the isonitriles CNC6H4C6H4OCnH2n+1-p. Metathetical reactions with KBr or KI afford the corresponding [AuX(CNC6H4C6H4OCnH2n+1-p)](X = Br, I). While the free isonitriles are li…
The use of intravenous contrast media is well established in magnetic resonance (MR) for improved diagnosis. MR differs from other imaging modalities in the complexity of signal and contrast dependence, with the method of measurement having great impact on tissue contrast. Unlike computed tomography, in which contrast…
This paper details postchemical‐mechanical planarization cleanup process development for interlayer dielectric films. The scope of the paper includes defining a base line polish process and developing a post‐CMP cleanup process using 150 mm wafers. The efficiency of the cleaning process was evaluated by the number of…
The reaction between tetrathiafulvalene (TTF) and suitable arenediazonium salts leads to products arising from an ordered sequence of reactions featuring electron transfer, loss of nitrogen, radical cyclisation and nucleophilic substitution. The tetrathiafulvalenium salt 6 is shown to be an intermediate in the reactio…
The present study investigates the mechanics of roll formation between sliding bodies at elevated temperatures and humid conditions. Silicon is used as the model material for reciprocating linear sliding tests. The evolution of tribological rolls initially involves the rapid oxidation of silicon wear debris by water,…
Comprehensive x-ray-diffraction data and structure factor calculations are presented for oriented poly(3-octylthiophene) films intercalated by iodine vapor to ${\mathrm{I}}_{3}^{\mathrm{\ensuremath{-}}}$ concentrations of 0, 4, 14, 26, and 45 mol wt. % per octylthiophene monomer. These data reconfirm previous reports…
[MnOEP][A]{A=[TCNE]˙– and [C4(CN)6]˙–} have been isolated as extended 1D coordination polymers with trans-µ2-[A] bridging ligands with strong {A=[C4(CN)6]˙–} and weak {A =[TCNE]˙–} ferromagnetic coupling as evidenced from the fit of the magnetic susceptibility to the Curie-Weiss law (θ= 5.1 and 67.1 K, respectively);…