Materials Literature
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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.
The chromium(II) compound [C[graphic ommitted])-µ-Na(thf)2}2]1 has been isolated and structurally characterised; in combination with trimethylaluminium, it is a precatalyst for the polymerisation of ethene to linear polyethylene.
Abstract The results of the sorption and diffusion of aldehydes and ketones into structurally different elastomers such as ethylene propylene diene terpolymer, styrene butadiene rubber, nitrile butadiene rubber, neoprene and natural rubber are described in the temperature interval of 25‐60°C. From these data, the Arrh…
A series of copolyimides based on 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA)(1,2,4,5,-benzenetetracarboxylic dianhydride) and 2,2′-bis(trifluoromethyl) benzidene (PFMB) have been synthesized with varying BPDA–PFMB and PMDA–PFMB compositions. A systematic change in the linear…
The effects of tensile pseudoelastic cycling of Cu–Zn–Al single crystals containing a dense distribution of small (≈10 nm) γ-phase precipitates have been studied. The σ-ε curves show a reduction of hysteresis after the first transformation cycles caused by a shift of the direct transformation to progressively lower st…
A series of fully aromatic copolyimides have been synthesized from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA), and 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (PFMB) in m-cresol, (BPDA–PFMB)x-(PMDA–PFMB)y. The molar composition ratios are 100 : 0, 85 : 15, 70 : 30 and 50 :…
Lateral substitution in the peripheral phenyl groups of the triphenylen-2,3,6,7,10,11-hexayl hexakis(4-alkoxybenzoate)s has been investigated via dimethyl substitution ortho to the terminal alkoxy chain or the ester linking group. Similarly, lateral methyl substitution in the terminal alkoxy chain was also investigate…
The cation [Ru(C8H12)]2+ was supported on [P3O9]3–, [V4O12]4– and [Nb2W4O19]4– polyoxoanions. All the complexes were stable in air and were characterized by elemental and thermogravimetric analysis, IR, 1H, 13C and 31P NMR spectroscopy. The crystal and molecular structure of [NBu4][Ru(C8H12)(MeCN)-(P3O9)]·Et2O has bee…
The reaction of a nickel(II) imidazolate complex [NiL1](H2L1= 5-{o-[5-chloro-2-hydroxyphenyl)phenylmethyleneamino]phenyliminomethyl}imidazole) with iron(III) Schiff-base complexes [FeL2Cl], [FeL3]+ and [FeL4]+[H2L = R(NCHC6H4OH-o)2; R =(CH2)2(L1), (CH2)3NH(CH2)3(L2) or (CH2)3NMe(CH2)3(L3)] yielded the imidazolate-brid…
ABSTRACT Acetic acid solutions (0.5, 1.0 and 3.0%) were packed in polyethylene aluminum foil laminated material and adhesion between the layers was measured during 28‐days storage at room temperature (∼23°C). Peel tests showed that in 3% acetic acid adhesion between layers was almost totally lacking after 4 days. Afte…