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A numerical study of the stability of the AB 13 crystal structure in a mixture of dissimilar hard spheres is reported. This crystal structure has recently been observed by Bartlett and coworkers in experiments on suspensions of colloidal hard-sphere mixtures. We find that, over a range of densities and diameter ratios…
Protonic conduction of both stoichiometric and nonstoichiometric mixed perovskite ceramics with the general formula A2(B′1+xB″1−x)O6−δ(A=Sr2+, Ba2+; B′=Ga3+, Gd3+, Nd3+; B″=Nb5+,Ta5+; x=0−0.2) has been investigated. The B-site occupancies of B and B can be ordered or disordered depending on the ionic radius of the A i…
Chemical vapor deposition (CVD) of copper from (hfac)copper(I)VTMS, where hfac = hexafluoroacetylacetonato and VTMS = vinyltrimethylsilane has been studied as a function of temperature and pressure. Analogous to other , (hfac)CuVTMS also deposits pure copper films via a quantitative thermally induced disproportionatio…
The effects of pore morphology and grain size on the dielectric behavior of high‐purity stoichiometric BaTiO 3 have been intensively investigated. It was found that the dielectric constant was influenced not only by grain size but also by pore morphology. Dielectric constants below the Curie temperature could be evalu…
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The decomposition of mixed barium titanium oxalates was studied by means of various thermochemical as well as spectroscopic methods. Infrared (IR) spectra of the mixed oxalates indicate the existence of an octahedral complex with Ti chelated by oxalate groups. In general, the results of both IR and the thermochemical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled photocycloaddition of unsaturated carboxylates intercalated in hydrotalcite clay interlayersKatsuhiko Takagi, Tetsuya Shichi, Hisanao Usami, and Yasuhiko SawakiCite this: J. Am. Chem. Soc. 1993, 115, 10, 4339–4344Publication Date (Print):May 1, 1993Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic spin alignment in molecular systems: an orbital approachChristian Kollmar and Olivier KahnCite this: Acc. Chem. Res. 1993, 26, 5, 259–265Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.a…
Previous studies show that the collagen fibrils of the mammalian vitreous humor are assembled largely from type II collagen with smaller amounts of type IX collagen and either type V or type XI collagen. In this paper, we report the separation of two chains of type V/type XI collagen from type II collagen by heparin-S…
Deposition of carbon nitride thin films on Si(100) and polycrystalline Zr substrates was performed by dc magnetron sputtering of a graphite target under a pure nitrogen ambient. The resulting carbon nitride films (CNx) are primarily amorphous with a small volume fraction of nanocrystallites. Both energy-dispersive x-r…
A binary mixture of hard-sphere polyions and monovalent point counterions is studied using the virial expansion (VEX) of the Ornstein-Zernike equation. The zero-order VEX term, which coincides with the symmetrized Poisson-Boltzmann equation (SPB), exhibits an attraction among polyions at sufficiently high temperatures…
The IR emission of liquid CaO-Al2O3 slags is caused by IR active molecule vibrations of and -complexes. In the liquid CaO-Al2O3 slags the equilibrium dominates. At lower temperatures (1000°C) the formation of condensed -complexes was observed (glassy state). By the addition of B2O3 to CaO-Al2O3 slags B-O-Al associatio…
Abstract The main properties of a new thermoluminescent (TL) material (LiF:Cu,Mg,P) produced in the People's Republic of China under the name of GR-200A have been already investigated by others. The purpose of this work is to establish a standardised procedure for use. Careful experiments were carried out with the aim…
Diffusion of impurities against the direction of gas flow can be a significant source of contamination in the ultrapure gas systems. The mechanism and the kinetics of impurity transport due to back‐diffusion is studied both experimentally and theoretically. A model is developed to simulate the process and calculate th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransport coefficients of oligo- and poly(dimethylsiloxanes) in dilute solutions. The draining effectTakeshi Yamada, Hitoshi Koyama, Takenao Yoshizaki, Yoshiyuki Einaga, and Hiromi YamakawaCite this: Macromolecules 1993, 26, 10, 2566–2574Publication Date (Print):May 1, 1993P…
Abstract 1,5‐Naphthalenediol was alkoxylated with 1‐alkyl bromides containing 3‐16 C‐atoms and then acylated with 4‐fluorobenzoyl chloride under Friedel‐Crafts conditions in 4‐ and 8‐position of the naphthalene ring. These new difluorides ( 3a–d ) were condensated with hydroquinone, bisphenol‐A and 4,4′‐biphenyldiol,…
FT-IR was used to characterize the surfaces of Al after various chemical treatments. All of the oxide surfaces were composed of an anhydrous alumina, aluminum oxyhydroxide (pseudoboehmite) and aluminum hydroxide (close to Gibbsite). The major contaminants in the different oxides are chemisorbed CO2, carbonates and bi-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethanol-formic acid esterification equilibrium in sulfuric acid solutions: influence of sodium saltsBhart Indu, William R. Ernst, and Leslie T. GelbaumCite this: Ind. Eng. Chem. Res. 1993, 32, 5, 981–985Publication Date (Print):May 1, 1993Publication History Published onlin…
CaAI4 undergoes a reversible, structural transformation at 170 °C according to high-temperature X-ray powder diffraction experiments. The high-temperature phase adopts the tetragonal BaAI4 structure (space group I4jmmm), while the low-temperature phase is monoclinic, C2jm, with lattice parameters, a = 6.1526 (15) A, b…
Cross sections for the photoionization of the argon 3s electron are presented from threshold up to 100 eV. In order to cover this whole energy range with comparable accuracy, we used two complementary methods: absolute measurements by photon-induced fluorescence spectroscopy (PIFS) and relative measurements by time-of…