Materials Literature
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Abstract The acidic Cs salt of 12-tungstophosphoric acid (Cs/polyanion = 2.5) was much more active for liquid phase decomposition of cyclohexyl acetate than Nafion, HY-zeolite, H-ZSM-5, Al3+-exchanged montmorillonite, and SO42−/ZrO2.
A novel method of crystal growth which utilizes an axial submerged heater is proposed and numerically simulated. Single crystals should be grown by directional solidification in vertical bottom seeded crucibles. Submerged in the melt, the heater supplies the heat axially downward, enclosing and stratifying a small act…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and high temperature chemistry of methylsilsesquioxane polymers produced by titanium-catalyzed redistribution of methylhydridooligo- and -polysiloxanesRichard M. Laine, Jeffrey A. Rahn, Kay A. Youngdahl, Florence Babonneau, Martin L. Hoppe, Zhi Fan Zhang, and John…
The lumazine synthase-riboflavin synthase complex (heavy riboflavin synthase) of Bacillus subtilis consists of an icosahedral capsid of 60 beta-subunits containing a core of three alpha-subunits. The enzyme has been purified from the derepressed mutant H 94 of B. subtilis by a novel efficient procedure using column ch…
Backscattered electron (BSE) imaging is being developed into an accurate and useful technique for determining changes in bone morphology, histometry, and mineral content. BSE is currently used as a tool for quantifying the response of mineralized tissue to biomaterials. This paper briefly discusses the physics of BSE…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentaammineruthenium(III) phenylcyanamide complexes: crystal structure determination and the dependence of b1*.rarw. b1 LMCT oscillator strength on the nature of the phenylcyanamide ligandRobert J. Crutchley, Kierstan McCaw, Florence L. Lee, and Eric J. GabeCite this: Inorg.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel copper(II) complex containing the ligand 1,2-bis(2,2'-bipyridyl-6-yl)ethane: structural, magnetic, redox, and spectral propertiesTy Garber, Shawn Van Wallendael, D. Paul Rillema, Martin Kirk, William E. Hatfield, Jane H. Welch, and P. SinghCite this: Inorg. Chem. 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of peroxide bridged copper dimers of relevance to oxyhemocyaninPaul K. Ross and Edward I. SolomonCite this: J. Am. Chem. Soc. 1990, 112, 15, 5871–5872Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 J…
An icosahedral phase with a face-centered six-dimensional hypercubic lattice (F-type) and a decagonal phase were found to be formed in rapidly solidified Al-Pd-TM (TM=V, Cr, Mn, Fe, Co, Mo, Ru, Re or Os) and Al-Pd-Co alloys, respectively. The formation of the mostly single quasicrystalline phases is limited to the nar…
Abstract Silver as a catalyst additive showed an excellent effect to improve the catalytic activity of cobalt oxide for the decomposition of nitrogen monoxide below 773 K. Reaction inhibition by oxygen was very much relieved by using Ag–Co oxide catalysts.
Nanocrystalline diamond ceramics—namely, polycrystalline diamond compact consisting of ultrafine grains (one to hundreds of nanometers)—have been produced without any sintering additives via a shock compaction method using commercial diamond powders which consist of monocrystalline or shock‐synthesized polycrystalline…
The small angle neutron scattering (SANS) technique has been used to study the concentration fluctuations of binary polymer mixtures under shear. Two different polymer systems, deuterated polystyrene/poly(vinylmethylether) and deuterated polystyrene/polybutadiene, have been studied as a function of temperature and she…
This paper describes the development of a new mathematical model of the incubation period of crevice corrosion. The model uses a new treatment of the transport processes, which includes both ionic migration and diffusion. An explicit finite-difference technique was applied to a uni-dimensional crevice along the crevic…
The sol–gel process has been applied successfully to the preparation of small‐particle‐size CdS‐doped silica glasses with a significant quantum size effect. Gels prepared through the hydrolysis of a complex solution of Si(OC 2 H 5 ) 4 and Cd(CH 3 COO) 2 ·2H 2 O were heated at 500°C, then reacted with H 2 S gas to form…
Abstract The meaning of attenuation length (AL) of x‐ray photoelectrons (and Auger electrons) in solids is reviewed in the light of new evidence pointing to strong dependences of AL on take‐off angle and film thickness, which can be traced back to elastic scattering. Since signal attenuation in XPS (and AES) can devia…
Experimental investigations of the catalytic CO oxidation on a Pd(110) surface revealed that the temporal oscillations in the reaction rate (measured in a range 10−3 Torr<p<1 Torr) can be traced back to a periodic formation and depletion of oxygen in the subsurface region. Oscillations in the reaction ra…
Cubic boron nitride (c-BN) films have been prepared by sputtering of a hexagonal BN sintered target under a negative self-bias voltage applied to Si substrates and a sputtering gas composition of Ar/N 2 . A c-BN phase was found to be contained only in the films prepared in pure Ar discharge with a negative self-bias a…
Microscopic distributions of growth rates on GaAs(001) layers next to (111)A and (111)B surfaces were measured in real time during molecular beam epitaxy growth by scanning microprobe reflection high-energy electron diffraction. The increase in the growth rate on the GaAs(001) surface near the edge of (111)A surfaces…
In a newly developed ultrahigh-vacuum (UHV) film preparation system equipped with in situ reflection high-energy electron diffraction (RHEED) and X-ray photoelectron spectrometer (XPS) analyzer, a sintered CeO 2 target was ablated by ArF excimer laser to deposit films on Si(001), (111) and (110) substrates at temperat…
An improved protocol for crystallographic refinement by simulated annealing is presented. It consists of slow cooling starting at high temperatures. Tests of refinements of aspartate aminotransferase and procin pepsin show that the slow-cooling protocol produces lower R factors and better geometry than other protocols…