Materials Literature
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The new segmental ligand L2, which possesses a terminal N,N′-diethylcarboxamido group, reacts with EuIII and ZnII to give the highly stable and strongly luminescent self-assembled helical heterodinuclear d–f complex [EuZn(L2)3]5+.
Collagen-based materials can be designed for use as scaffolds for connective tissue reconstruction. The goal of the present study was to evaluate the behavior of collagen materials as well as cell and tissue reactions after the conjugation of activated polyethylene glycols (PEGs) with collagen. It is known that protei…
Plasma polymerization of ethylene and ammonia gas mixtures is used to obtain uniform polymer coatings on the surface of AS4 graphite fibers. The polymer deposition rates were determined for processing parameters such as composition of the monomer mix, monomer flow rate, chamber pressure, and power input of the radio f…
The adsorption of NO, NO2 and N2O at various temperatures on mono- and multi-layered V2O5/ZrO2 catalysts prepared by the gas-phase method has been investigated by IR spectroscopy. On the reduced samples of both mono- and multi-layer catalysts, NO is adsorbed giving mono- and di-nitrosylic species. On the oxidized form…
The gene encoding the enzyme citrate synthase has been cloned and sequenced from the hyperthermophilic Archaeon Pyrococcus furiosus, and the derived amino acid sequence has been phylogenetically compared with citrate synthases from archaeal, bacterial and eukaryal organisms. The gene has been over-expressed in Escheri…
The evolution of the phases in galvanneal coatings on IF and IFP steel sheets is studied by combining optical microscopy (OM), scanning electron microscopy (SEM) with X-ray microanalysis (EDS) and transmission electron microscopy (TEM). The early stage of galvannealing is dominated by the formation of intermetallic co…
The crystal structure of a new dihydrogendecavanadate(V) of n-hexylammonium has been determined by means of X-ray diffraction data. Empirical bond length/bond number calculations have located the protonation sites in two triply-linked oxygen atoms which reinforce theoretical results of relative basicities of the oxyge…
TiO2–Al2O3 mixed oxides have been prepared by cohydrolysis of Ti4+ and Al3+ isopropoxides. Textural and acid–base properties were investigated using nitrogen physisorption, adsorption of probe molecules followed by FTIR spectroscopy, and test-reactions. Catalysts were found to exhibit high surface areas and pore volum…
Multiple oxide titanates have been prepared via the sol-gel method by the reaction of an alcoholic solution of titanium n-butoxide, Ti(OC4H9)4, with nitrate solutions, M(NO3)2(M = Mg, Ca, Sr, Ba), at room temperature. The amorphous gels so obtained under acidic conditions were calcined at temperatures between 700 and…
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…