Materials Literature
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Raman spectra of paratellurite, tellurite and pure TeO2 glass were measured. The normal vibration of paratellurite and tellurite was analyzed. The spectrum of pure TeO2 glass were deconvoluted into symmetric Gaussian functions. The normal vibrations of paratellurite are exactly described as combined representations of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ionically crosslinkable polyphosphazene: poly[bis(carboxylatophenoxy)phosphazene] and its hydrogels and membranesHarry R. Allcock and Sukky KwonCite this: Macromolecules 1989, 22, 1, 75–79Publication Date (Print):January 1, 1989Publication History Published online1 May 20…
Collagen undergoes progressive browning with aging and diabetes characterized by yellowing, fluorescence and crosslinking, the cause of which remains unelucidated. As an initial step towards understanding the mechanism(s) of insolubilization of collagen in aging, the major fluorophores/chromophores from the insoluble…
The rate constants for the quenching of the excited states of metal ions and complexes in homogeneous fluid solution are reported in this compilation. Values of kq for dynamic, collisional processes between excited species and quenchers have been critically evaluated, and are presented with the following information,…
The charge-storage mechanism and the design of the ultracapacitor are described. Based on a ceramic with an extremely high specific surface area and a metallic substrate, the ultracapacitor provides extremely high energy densities and exhibits low ESR (equivalent series resistance). The combination of low ESR and extr…
The methionine analog norleucine was produced during the synthesis of bovine somatotropin by Escherichia coli strain W3110G containing the recombinant plasmid pBGH1. Norleucine was generated by the leucine biosynthetic pathway from pyruvate or alpha-ketobutyrate in place of alpha-ketoisovalerate as the initial substra…
Cu–Zn hydroxycarbonates have been studied as precursors of Cu–ZnO catalysts, with particular reference to the effect on catalyst activity of ageing the precursor prior to decomposition and reduction. The precursor obtained by precipitation from mixed nitrate solution (Cu/Zn molar ratio 2:1) at 333 K and pH 7.0 consist…
An instrument has been developed to determine the adhesive fracture energy as a function of the most important parameters such as temperature, contact time etc. and to study the stress–strain behaviour during bond separation. Additionally, the deformation processes during debonding were observed by high speed photogra…
"‘Ternary alloys - a comprehensive compendium of evaluated constitutional data and phase diagrams’." British Corrosion Journal, 24(3), pp. 180–181
The introduction of 3d transition metals (M) into the van der Waals gaps between the weakly coupled layers of transition metal dichalcogenides TX2 (T:transition metal, X:chalcogen) produces an interesting family of intercalation compounds, M x TX2, the physical properties of which are different from those of the host…
Fourier transform infrared reflection absorption spectroscopy (FT‐IRAS) and polarization resistance measurements have been used to investigate the surface structure and inhibiting properties of all four monosubstituted methylbenzotriazoles on copper surfaces. The formation of a protective barrier layer is strongly dep…
ANION-EXCHANGE IN LITHIUM ALUMINATE HYDROXIDES
A B ST R A C T : Well-cuttings and core samples from four Gulf Coast areas have been examined by high-resolution scanning-transmission electron microscopy and other techniques to detail the chemical, mineralogical and textural changes during diagenesis. Wells in each of the four areas exhibit a distinct smectite-to-il…
The isotropic-symmetry-breaking bifurcations occurring in a class of liquid-crystal models describing particles with the symmetry of rectangular slabs are studied. The model free-energy functional employed is appropriate to both the mean-field treatment of anisotropic dispersion forces and the Onsager approximation fo…
The tight binding band electronic structures of the molecular conductors X[M(dmit)2]2 (X = TTF, (CH3)4N ; M = Ni, Pd) are reported. In the cases of TTF(Ni(dmit)2] 2, α- and α'-TTF [Pd(dmit)2]2, it is shown that both the LUMO (lowest unoccupied molecular orbital) and HOMO (highest occupied molecular orbital) bands of t…
Ten members of the homologous series α,ω-bis(2,4-dimethylanilinebenzylidine-4′-oxy)alkanes and four members of the α-(4-cyanobiphenyl-4′-oxy)-ω-(2,4-dimethylanilinebenzylidine-4′-oxy)alkanes have been synthesized. Their transitional properties are compared to those of the analogous compounds not possessing the 2-methy…
A number of α- and β-glycosides with long chain aliphatic alcohols as aglycones were prepared, and the liquid-crystalline properties of the various mono-, di, and trisaccharide series compared. Further, the first liquid-crystalline glycosides of glucuronic acid and of an amino sugar hydrochloride were detected. It may…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic interactions between t2g3 and eg2 magnetic orbitals in a chromium(III)nickel(II)3 tetranuclear compoundYu Pei, Yves Journaux, and Olivier KahnCite this: Inorg. Chem. 1989, 28, 1, 100–103Publication Date (Print):January 1, 1989Publication History Published onlin…
Experimental results from electrochemical e.s.r. on electrodes modified with conducting polymers such as polyaniline, polypyrrole and polythiophene are presented. The results show that the polymer exists in two forms, one stable when it is insulating (α) and the other (β) when it is conducting. In the conducting regio…
High enantioselectivities (up to 96% ee), almost quantitative chemical yields, and mild reaction conditions characterize the title reaction. It is suitable, for example, for the synthesis of isoprenoid chains as occur in the vitamins E and K1. An example is reaction (a), R CH2OSiMe2tBu.