Materials Literature
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The adsorption and reaction of NO on a model catalyst composed of Rh supported on ceria has been studied. CeO2 films were grown epitaxially by laser ablation onto SrTiO3(001) substrates. X-ray diffraction and transmission electron microscopy indicate the films are single crystalline with (001) orientation. Comparison…
The diffuse phase transition in ferroelectrics with mesoscopic heterogeneity has been discussed within the context of a superparaelectric model by using the Ginzburg-Landau formalism. In the Curie region ferroelectrics with mesoscopic heterogeneity are treated as 'superparaelectrics' consisting of a mass of polar clus…
Novel biodegradable and biocompatible polyesters have been prepared by random copolymerization of ε-caprolactone (ε-CL) and 1,4,8-trioxaspiro[4.6]-9-undecanone (TOSUO) initiated by Al(O i Pr) 3 . Copolyesters of molecular weight ( M̄ n ) up to 10 4 and containing up to 90 mol % TOSUO repeating units have been prepared…
Dedensification (up to 10% of the theoretical density in some instances) occurs at temperatures of .1320°C during the sintering of commercial undoped BaTiO 3 powders. The expansion of the rigid, interconnected network of large, rounded grains that grow by the Ostwald ripening effect can explain the dedensification tha…
This work was conducted as part of our continuing effort to determine the factors that affect cation formation for organometallic aluminum complexes. In this study, the interactions of R(2)AlX (where R = Me, (i)Bu, (t)Bu; X = Cl, Br, I) with the monodentate bases thf, pyridine, NEt(3), HN(i)Pr(2), H(2)N(i)Bu, H(2)N(t)…
A new series of ferroelectric liquid crystal materials containing a lateral methyl group on the aromatic ring of the alkoxybenzoate unit has been synthesized and investigated. These materials exhibit a wide temperature range of ferroelectric SmC* phase on cooling (including supercooling) with a very high spontaneous p…
Physics studies have been performed for the compatibility of DUPIC fuel design to the existing CANDU-6. The DUPIC fuel is made of spent pressurized water reactor fuel through a dry process, and the bundle design utilizes an advanced CANDU fuel bundle geometry that is mechanically compatible with the current fuel chann…
By irradiation with linearly polarized light optical anisotropy is generated in isotropic films of photochromic LCP's due to a photoorientation process. Generally, the efficiency is much higher in films of polymers with a high content of azobenzene moieties. On the other hand, the photochemically induced orientation o…
Abstract The use of lateral substitution on the aromatic rings of the diacid component of diacid/bispyridyl AABB supramolecular LC polymers is effective at retarding crystallization presumably by introducing a ‘carbuncle’ along the chain which interferes with the requisite efficient close packing of molecular units. W…
The static structure of molten AgBr and AgCl have been calculated using the hypernetted chain theory of liquids (HNC) and molecular dynamics simulations (MD) with effective potentials based on the functional form originally proposed by Vashishta and Rahman [Phys. Rev. Lett. 40, 1337 (1978)] to study α-AgI. The HNC and…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Functional Mimic of the New Class of Tungstoenzyme, Acetylene HydrataseJyoti Yadav, Samar K. Das, and Sabyasachi SarkarView Author Information Department of Chemistry Indian Institute of Technology Kanpur Kanpur-208016, IndiaCite this: J. Am. Chem. Soc. 1997, 119, 18…
The polarization behaviors of porous samaria‐doped ceria anodes coupled with zirconia electrolytes with various ionic conductivities (σ ion ) were investigated. The exchange current density, j 0 , on such mixed‐conducting SDC anodes was not influenced by the σ ion at 900 and 1000°C, whereas j 0 increased proportionall…
Zirconia-modified silica and alumina samples were prepared by the atomic layer epitaxy technique using successive saturating reactions of ZrCl 4 and H 2 O vapors. The growth of ZrO 2 was followed by X-ray diffraction, diffuse reflectance IR Fourier transform spectroscopy, and 1 H magic angle spinning NMR measurements.…
The stable ternary system H 3 PO 4 ‐Ca(OH) 2 ‐H 2 O has been established further by determining the equilibria among the acidic calcium phosphates. In particular, equilibria involving CaHPO 4 ·2H 2 O, CaHPO 4 , Ca(H 2 PO 4 ) 2 ·H 2 O, and Ca(H 2 PO 4 ) 2 ·H 2 O have been established. In contrast to earlier opinions, C…
Two types of experiments on metastable pitting are carried out in NaCl solutions, one with galvanically coupled Al‐2% Cu and the second with 316L stainless steel under potentiostat control; the time dependence of the current is compared to simulated time series developed from the model of Part I of these two papers. T…
The structural basis for the dual specificity of the malonyl-CoA/acetyl-CoA:acyl carrier protein S-acyltransferase associated with the multifunctional animal fatty acid synthase has been investigated by mutagenesis. Arginine 606, which is positionally conserved in the transacylase domains of all multifunctional fatty…
Passivated and unpassivated Al single-crystal lines with (110), (133), and (111) planes parallel to the substrate have been fabricated and electromigration tests have been performed to study transgranular failure mechanisms. Both erosion voids and slitlike voids with {111} facets were observed in single-crystal lines.…
Abstract The structural collapse of mesoporous molecular sieves MCM-48 and MCM-41 materials by mechanical compression was found to occur mechanochemically through the hydrolysis of Si-O-Si bonds. Their ordered structures were well retained by compressing the samples under dry N2.
A novel method of determining the cell thickness and the twist angle of twisted nematic liquid crystal (TNLC) cells by measurement of the Stokes parameters of light transmitted through the cell is presented. The relationships of the Stokes parameters of transmission light to the cell thickness and the twist angle are…
A stochastic model for localized corrosion is investigated both analytically and numerically. A feature of the model is that each metastable pitting event can influence subsequent events, although the influence of an individual event decays with time. The model describes an abrupt, cooperative transition from metastab…