Materials Literature
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We describe here an innovative method for Pd-dissolution using the reagent N,N'-dimethylperhydrodiazepine-2,3-dithione diiodine adduct which, being safe and powerful, is appealing for practical applications: remarkably almost quantitative Pd-recovery from model spent three-way catalysts has been obtained, showing that…
Rice hull ash (RHA) silica (80–98 wt.% amorphous, >25 m2 g−1 silica, 2–20% porous amorphous C) can be depolymerized in aqueous alcohol with [NR4]8OH (R = Me, CH2CH2OH) under ambient conditions with the selective formation of octasilicate anions, [NR4]8[OSiO1.5]8. Dissolution kinetics were studied as a function of base…
A series of 4-dialkylamino-2,5-dihydroimidazole nitroxides with pyridine-4-yl, 4-dimethylaminophenyl or 4-hydroxyphenyl groups in position 2 of the imidazole ring were prepared using the reaction of RMgBr with corresponding 5-dialkylamino-4,4-dimethyl-4H-imidazole 3-oxides. The EPR spectra of the nitroxides were shown…
“Tunnel oxides” is a rather generic term which historically refers to a number of minerals which, from a chemical point of view, are (mainly) manganese oxides. In nature manganese occurs in three different oxidation states - Mn2+, Mn3+ and Mn4+ - with the latter being the dominant form in tunnel oxides. Tetravalent ma…
A fluoride catalyzed route for the synthesis of catalytically active non-ordered mesoporous silica based materials in the absence of surfactants is presented and discussed. This synthesis procedure has allowed the introduction of different organic and inorganic functionalities with specific chemical activities within…
Densely packed arrays of split-ring resonators (SRRs) are used as an artificial magneto-dielectric substrate to reduce the resonant frequency of a λ/2 patch antenna. The SRR stacks (also called metasolenoids) embedded into dielectric medium constitute an anisotropic magneto-dielectric substrate, thus allowing a consid…
Copolymeric products from 2-methylaziridine and carbon dioxide showed sharp and rapid phase transitions in response to both temperature and pH; the responsive property can be controlled by varying the reaction conditions whilst maintaining the supercritical state.
A new tellurate, BaTiTe3O9, was found in the BaO-TiO2-TeO2 ternary system. Using conventional solid state reaction, the new single phase compound, BaTiTe3O9 phase was synthesized and sintered over the very low temperature range of only 625-700°C. In addition, different calcinations routes, including the effect of TiTe…
Abstract. The paper gives an introduction to nanostructuring techniques used for industrial fabrication of bulk nanocrystalline metals – basic materials utilized in shaping nanoscale structures. Nanostructured metals, called nanometals, can be produced by severe plastic deformation (SPD). We give an expert coverage of…
Three trinuclear complexes, NiII MnIII NiII, NiII CrIII NiII and Ni(II)3 based on (pyridine-2-aldoximato)nickel(II) units are described. Two of them, and , contain metal-centers in linear arrangement, as is revealed by X-ray diffraction. Complex is a homonuclear complex in which the three nickel(II) centers are dispos…
Many readily available fuels, to some extent, contain sulfur, which is very detrimental to existing solid oxide fuel cells (SOFCs). A pyrochlore-based anode material, , showed remarkable tolerance to sulfur-containing fuels. The anode/electrolyte interfacial resistance was only at 950°C in a fuel gas mixture of 10% an…
[Re(CO)3(CNx)(L)]+, where CNx = 2,6-dimethylphenylisocyanide, forms complexes with L = 1,10-phenanthroline (1), 4-methyl-1,10-phenanthroline (2), 4,7-dimethyl-1,10-phenanthroline (3), 3,4,7,8-tetramethyl-1,10-phenanthroline (4), 2,9-dimethyl-1,10-phenanthroline (5) and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (6)…
The new ligand, [(1,4,8,11-tetraazacyclotetradecan-1-yl)methyl]phosphonic acid (H(2)te1P, H(2)L), was synthesized and its complexing properties towards selected metal ions were studied potentiometrically. The ligand forms a very stable complex with copper(ii)(logbeta(CuL)= 27.34), with a high selectivity over binding…
Knowledge of the geometry effect on impurity incorporation and grain growth in narrow lines is important for reducing copper line resistivity. In this paper, we investigate impurity incorporation in narrow lines with time-of-flight secondary ion mass spectroscopy. We also study the influence of linewidth, trench depth…
As part of an effort to develop new lumaphors involving late transition metal ions, this report describes the synthesis and characterization of the first platinum(II) derivatives containing 2,2':6',2''-terpyridine (trpy) and cyanide as co-ligands. According to existing models, including cyanide in the coordination sph…
Coatings containing polyaniline emeraldine salt (ES) or base (EB) dispersed in organic binder were applied to Al, Fe, Zn, and Mg substrates and held in air at 93% RH. EB coatings produce neither oxide growth nor increase in open circuit potential ( E oc ) . ES coatings induce oxide growth. They also increase E oc to c…
We report here a detailed characterization of the surface chemical states and morphology of polyimide (PI) films following modifications by plasma treatment and electroless copper deposition. and Ar plasma treatments have been successfully used to achieve morphological and chemical modification of the PI surface so th…
This article, based on material from a 2003 PhRMA workshop on acceptable analytical practices, provides guidance for developing dissolution testing for poorly soluble compounds. The first article from the workshop, about phased method validation, was published in November. Future articles will cover analytical method…
Atomistic simulations of the structures and defect energetics of two mixed-conducting strontium ferrite materials, Sr2Fe2O5 and Sr4Fe6O13, are reported. Oxygen Frenkel defects are found to be the predominant intrinsic defects in both materials, with the Frenkel energy in the intergrowth structure, Sr4Fe6O13, being muc…
The interaction between FSM-16 and flurbiprofen (FBP) in the mesopores of FSM-16 was investigated by using three types of FSM-16 with different pore diameters, i.e., FSM-16(Oc), FSM-16(Do) and FSM-16(Doc) (pore diameters 16.0, 21.6, 45.0 A, respectively). Solid dispersions of 30% FBP-70% FSM-16 were prepared by solven…