Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic Tantalum(V) Bis(dicarbollide) Complexes with Bent-Metallocene StructuresRoger Uhrhammer, Yue-Xin Su, Dale C. Swenson, and Richard F. JordanCite this: Inorg. Chem. 1994, 33, 19, 4398–4402Publication Date (Print):September 1, 1994Publication History Published online1 M…
A new test method has been developed to measure the resistance of dynamic fracture initiation in brittle materials under combined mode I / II loadings. The Brazilian disks with center-cracks have been fractured under oblique impact loadings in diametral-compression. The dynamic stress intensity factors of mode I and I…
The reactions of the N.N'-dialkyl/aryl-ethylenediamines l a - e with equimolar amounts of tetrachlorosilane give the monocyclic aminosilanes 2 a - e in good yields. With two equivalents of the diamines 1 only one spirobicyclic compound, l,4,6,9-tetrabenzyl-l,4,6,9-tetraaza-5-silaspiro[ 4.4]nonane, 4e, can be prepared.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExactly alternating silarylene-siloxane polymers. 10. Synthesis and characterization of silphenylene-siloxane polymers containing fluoroalkyl and hydrido side groupsPetar R. Dvornic and Robert W. LenzCite this: Macromolecules 1994, 27, 20, 5833–5838Publication Date (Print):S…
The use of cobalt or nickel alloys for added wear resistance was initiated in the early 1900s with the development of the cobalt-chromium-tungsten family of alloys. The cobalt alloys were called the Stellite'' because of their bright, shiny, nontarnished appearance. Further development and characterization of this all…
A thermal scanning camera has been used to measure the temperatures reached in a small tensile specimen of ductile Remco iron deformed at a strain rate of about 1600 s -1 in a split Hopkinson bar apparatus. True strains as high as 3.3 were reached in times of about 200 mu s, leading to a significant rise in temperatur…
The Escherichia coli K-12 NAD-dependent nucleotide-diphosphosugar epimerase, ADP-L-glycero-D-mannoheptose 6-epimerase, catalyzes the conversion of ADP-D-glycero-D-mannoheptose to ADP-L-glycero-D-mannoheptose. ADP-L-glycero-D-mannoheptose is a key intermediate of lipopolysaccharide inner core biosynthesis in several ge…
The structures, solution properties and solid state properties of complexes of poly(benzobisimidazobenzophenanthroline) ladder (BBL) and its semiladder analogue (BBB) with the Lewis acid aluminium(III) chloride (AlCl3) and gallium(III) chloride (GaCl3) are reported. At a 4:1 mole ratio of Lewis acid to polymer (BBB or…
Copper (II) oxide films of high chemical and crystal purity have been grown on MgO(100) substrates using pulsed laser ablation (248 nm) of copper in conjunction with a pulsed oxidizing gas source (N2O). A novel experimental geometry is presented, in which the gas pulse and ablation plume cross close to their respectiv…
We have investigated the temperature and concentration dependence of cross-relaxation processes in single-crystal fibers of YAG:${\mathrm{Pr}}^{3+}$ which were grown using the laser-heated pedestal growth technique. We have compared the time evolution of the $^{3}$${\mathit{P}}_{0}$${\ensuremath{\rightarrow}}^{3}$${\m…
The transmission and reflection properties of a homogeneous anisotropic uniaxial layer are discussed. The layer may be transparent or absorbing. Analytic expressions are given for the elements of a 4*4 mode matrix M characterizing such a layer, for any angle of incidence and for arbitrary orientation of the optic axis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Organometallic Chemistry of Tin: Reaction of Hydridotris(butyl)tin with the Surfaces of Partially Dehydroxylated AluminasChristophe Nedez, Frederic Lefebvre, Agnes Choplin, Gerald P. Niccolai, Jean-Marie Basset, and Eric BenazziCite this: J. Am. Chem. Soc. 1994, 116,…
Hydrothermal synthesis of lead zirconate titanate (PZT) films was achieved using two sequential processes. The first step is the reaction of the substrate with a solution, which is called the “nucleation process”, and the second step is the “crystal growth process”. Variation in the morphology of final products was pr…
Abstract Cycle class sequences are introduced as topological invariants of crystal structures. A cycle class is a class of translationally equivalent cycles, and a cycle class sequence is a sequence of numbers C 3 , C 4 ,…, C n ,…, where C n is the number of classes of cycles of length n . Such a sequence consists of…
Abstract A 29 Si MAS-NMR one-pulse and ﹛ 1 H﹜ CP comparative study of sepiolite, folded sepiolite, aluminated sepiolite, and palygorskite was conducted. The three main resonances of sepiolite at -92.0 ± 0.1, —94.3 + 0.1, and — 97.8 ± 0.1 p.p.m. were assigned with respect to the position of the Si atoms within the thre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear Gold(II) Complexes Containing Two Different Bridging Ligands. Crystal Structure of [Au2{.mu.-(CH2)2PPh2}{.mu.-S2CN(CH2Ph)2}Br2]Manuel Bardaji, M. Concepcion Gimeno, Peter G. Jones, Antonio Laguna, and Mariano LagunaCite this: Organometallics 1994, 13, 9, 3415–3419P…
Barium titanate (BaTiO 3 ) ceramics with high degrees of a‐ and c ‐axis orientation were fabricated by combining hydrothermal synthesis of fibrous particles, formation of green compacts with aligned extruded rods in the mold, and normal sintering. The orientation of crystal axes in such ceramics gives rise to high die…
Image analysis presents a quick, reliable, unbiased technique for determining cotton fiber maturity. This research entails developing sampling techniques for cotton fiber cross sections and creating a computer program to measure fiber characteristics directly by image analysis. A 10 minute (approximate) fiber/ resin e…
Vesuvianite can contain significant amounts of boron (up to-4 wtTo B2O). The crystal stnrctures of five boron-bearing vesuvianite crystals have been refined using MoKo X-ray data. Although the crystals are significantly biaxiat (2y < 20o), very careful examination of the diffraction data shows no deviation from…
In this Brief Report we use a self-consistent mean-field (SCF) method to predict the surface excess (${\mathit{z}}^{\mathrm{*}}$) and surface volume fraction (${\mathrm{\ensuremath{\varphi}}}_{1}$) of the surface active component in a binary polymer blend. The SCF results are in excellent agreement with the measured $…