Materials Literature
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Well crystallized zinc ferrite powder has been synthesized from a mixed-metal solution of ZnCl2 and FeCl2 near room temperature. A single phase of zinc ferrite was formed through the so-called green-rust structure containing Fe2+, Fe3+, Zn2+, OH– and Cl– at a temperature range of 30–60 °C, after aging for more than 2…
In situ FTIR results are presented for the electrochemical cycling of polypyrrole films containing entrapped sodium dodecyl sulfate, in aqueous sodium perchlorate and aqueous sodium carbonate solutions. In perchlorate solution, the film is oxidised in two stages, involving the formation of polarons and bipolarons; no…
This paper provides both experimental and theoretical evidence of the remarkable flexibility of B–O–X bond angles (X = Si or Ge). Single-crystal X-ray diffraction analyses of PhB(OSiPh3)2, PhB(OGePh3)2 and B(OSiPh3)3 are reported. In the compound B(OSiPh3)3, the B–O–SiPh3 units are sterically constrained and the three…
Abstract In the natrochalcite-type compounds NaCu 2 (H 3 O 2 )(SO 4 ) 2 and RbCu 2 (H 3 O 2 )(SeO 4 ) 2 the lengths of the two different hydrogen bridges vary widely: 2.44 Å and 2.70 Å in the Na-S member, and 2.60 Å and 3.03 Å in the Rb-Se member. Both structures were refined by single-crystal neutron diffraction meth…
The phase compOSitIOn, exothermal reaction energy, hydrothermal-induced phase transition and development of microstructure in aluminium phosphate cements (APCs), formed by the hydrothermal-catalyzed acid-base reaction between alumina as the base reactant and NH 2 H 2 PO 4 -based fertilizer (Poly-N) as the acid reactan…
A method is presented for predicting the thermal conductivity of low density, silica based fibrous insulators. It is shown that the method can be used to extend data values to the upper material temperature limits from those obtained from the test data. It is demonstrated that once the conductivity is accurately deter…
Relaxation of the 1A1 [graphic omitted] 5T2 spin equilibrium in acetonitrile of the complex of FeII with the multidentate pyridyl macrocyclic ligand N,N′,N″-tris(2-pyridylmethyl)-1,4,7-triazacyclodecane (tp[10]aneN3) after perturbation by a pulsed laser provides the first example of biphasic kinetics for spin crossove…
The highly asymmetric induction imparted by the iron chiral auxiliary [(η5-C5H5)Fe(CO)(PPh3)] is exploited in the preparation of homochiral (R)- and (S)-α-pentylsuccinates. Their application in the synthesis of (–)-actinonin and (–)-epi-actinonin is described.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of toluene disproportionation over unmodified and modified ZSM-5 zeolitesMaria A. Uguina, Jose L. Sotelo, and David P. SerranoCite this: Ind. Eng. Chem. Res. 1993, 32, 1, 49–55Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Publ…
Abstract In Northland, New Zealand, several large deposits of hydrated halloysite clay have been formed by the in situalteration of rhyolite volcanics of Pliocene or Pleistocene age. The rhyolites were erupted through pre-Pliocene sedimentary strata and locally through basalt. They are onlapped in places by more recen…
Bearthite occurs associated with lazulite in synmetamorphic quartz segregations of the Monte Rosa massif, where it has been partly described as a probably new Ca-phosphate by Peter Bearth (1952); it also occurs as an accessory rock-forming mineral in metapelite and magnesian schist of the coesite-bearing terrane, Dora…
To examine the stability of prototypes of the kilogram after cleaning, surface analysis techniques, including X-ray photoelectron spectroscopy (XPS), were applied to specimens cut from prototype material of Pt-10% Ir alloy. Traditional steam-jet cleaning (SJC) was compared with ultrasonic cleaning with solvents (UCS)…
Anionic and neutral complexes of europium and terbium with tetraaza phosphinate ligands are formed rapidly and are kinetically stable in vivo; the tetrakis(benzylphosphinate) terbium complex luminesces strongly via excitation into the proximate benzyl group involving efficient intramolecular energy transfer.
In this paper, we review current theoretical attempts to optimize the radiative inter-band transition rates in Si and Ge. Large optical emission rates in the far infrared have recently been predicted in laterally strained Ge and Ge-based superlattices. In strained bulk Si, however, a nearly 12% hydrostatic expansion w…
In order to study the reaction kinetics at the anode of solid oxide fuel cells , nickel stripe pattern was prepared on the surface of YSZ (8 m / o Y 2 O 3 doped ZrO 2 ) by an ion cluster beam (ICB) method and photolithography. Due to the grain growth of nickel film at high temperatures, the minimum possible width of t…
Abstract Single crystals of potassium pentaborate were grown by the solution growth method. The grown crystals were characterised by optical transmission spectrum, differential thermal analysis, and thermogravimetric analysis. The coefficient of thermal expansion was also determined and the results discussed.
Seebeck coefficients were measured for the cell . The electrolyte was yttria‐stabilized zirconia (YSZ) and the content of yttria in the electrolyte varied between 3 and 12 mole percent (m/o). Thus tetragonal and cubic crystal structures were investigated. Different sintering temperatures and times were used in sample…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis of alternating aromatic copolyimidesSuh Bong Rhee, Ji Woong Park, Bong Seok Moon, and Ji Young ChangCite this: Macromolecules 1993, 26, 2, 404–406Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https…
Low molecular weight physiologically active substance are useful at least as medicines or reagents for research. During our screening for new inhibitors, an actinomycetes culture produced inhibitor against histamine-release from rat mast cells. This inhibitor was isolated and named zincphyrin.