Materials Literature
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We studied the electronic conduction characteristics of sol-gel ferroelectric Pb(Zr 0.4 Ti 0.6 )O 3 thin-film capacitors by evaluation of time-dependent leakage current ( I-t ) and current-voltage ( I-V ) characteristics along with other dielectric properties. We derived an experimental formula to explain the leakage…
Some spectroscopic methods require solubilization or crystallization of proteins in heavy water because of the large difference in neutron scattering properties between protons and deuterons. In order to quantify the impact of slightly different physical properties of D 2 O and H 2 O, lysozyme solubility curves have b…
Abstract The polymerization of ethylene and 1‐octene by a recently developed homogeneous constrained geometry catalyst produces elastomers and plastomers with narrow molecular weight distributions, short chain branching compositions and the unique presence of long chain branching. Particular morphology and network str…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward New Electronic, Magnetic, and Optical Materials: Structure and Properties of the First Homobimetallic Tetrathiafulvalene Tetrathiolate Building BlockRichard D. McCullough, John A. Belot, Arnold L. Rheingold, and Glen P. A. YapCite this: J. Am. Chem. Soc. 1995, 117, 39…
Abstract A phenomenological approach to evaluating the agglomeration rate of growing crystals is presented. Crystals larger than the Kolmogoroff microscale collide because of the fluctuating velocity field. Bridges between the crystals form as a result of competition between crystalline growth and the turbulent veloci…
Three‐dimensional (3D) carbon fiber reinforced SiC and Si 3 N 4 composites have been fabricated using repeated infiltration of an organosilicon slurry under vacuum and pressure. Open porosity of the infiltrated body was reduced from 40% after the first infiltration to approximately 8% after the seventh cycle. Further…
Using TiH 2 and BN as raw materials, the reaction process of TiH 2 and BN in the temperature range 1000°‐1600°C was studied. Then TiN‐TiB 2 composites were prepared by reactive hot pressing. The effects of Ni addition on the sinterability and the mechanical properties of the composites were discussed. A composite cont…
Analytical expressions for calculating the electron paramagnetic resonance parameters D, a, and F are developed using a complete diagonalization procedure for 3${\mathit{d}}^{5}$ ions in a low-symmetry field. As illustrations, the formulas have been applied to RbCdF:${\mathrm{Mn}}^{2+}$, ${\mathrm{RbMnF}}_{3}$:${\math…
The energy-overlap problem in Laue diffraction often makes a Laue diffraction data set incomplete in a systematic way: low-resolution reflections more commonly overlap with other reflections than do reflections at higher resolution. We describe the development and testing of a harmonic deconvolution procedure that res…
We have made a detailed comparison between three competing methods for determining the free energies of solids and their defects: the thermodynamic integration of Monte Carlo (TIMC) data, the quasiharmonic (QH) model, and the free-energy-minimization (FEM) method. The accuracy of these methods decreases from the TIMC…
A Mroz image point, two surface, nonlinear-kinematic-hardening-plastic (MNKP) representation of bearing steel is inserted into a finite element model of 2-dimensional, line contact for pure rolling. The calculations are compared with previous results for the same contact pressure derived for elastic-linear-kinematic-h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic, Magnetic, Redox, and Ligand-Binding Properties of [MFe3S4] Clusters (M = Zn, Co, Mn) in Pyrococcus furiosus FerredoxinMichael G. Finnegan, Richard C. Conover, Jae-Bum Park, Zhi Hao Zhou, Michael W. W. Adams, and Michael K. JohnsonCite this: Inorg. Chem. 1995, 34,…
The relationship between biofilm formation and Reynolds number in laminar flow has been investigated usingPseudomonas fluorescens EX101. It was shown using a Modified Robbins Device that in laminar flow, numbers of viable cells in a developed biofilm increased with Reynolds number (Re 2, 17 and 51.5), as would be expe…
The corrosion behavior of five commercially available alloys (AISI 316L, AISI 310S, Inconel 601, Thermax 4762, and Kanthal A1) in molten carbonate under reducing gas atmospheres was investigated with cyclic voltammetry and quasi‐stationary polarization curve measurements. The reactions that proceed on these materials…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCholestanyl Substituted Quaternary Ammonium Salts as Gelators of Organic LiquidsLiangde Lu and Richard G. WeissCite this: Langmuir 1995, 11, 10, 3630–3632Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995htt…
Ferromagnetic exchange-coupling interactions mediated by siloxanolate ligands have been detected in the two nickel(II) nanoscale clusters Na2[(PhSiO2)6Na4Ni4(OH)2(O2SiPh)6]. 16Bu(n)OH (1) and Na2[(PhSiO2)6Ni6(O2SiPh)6Cl].12CH3OH. H2O (2), which qualify as interesting precursors for new molecule-based magnetic material…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Iron with Dipicolinic Acid. 2. Bridging Role of Carboxylate Groups in Solid State StructuresP. Laine, A. Gourdon, and J.-P. LaunayCite this: Inorg. Chem. 1995, 34, 21, 5138–5149Publication Date (Print):October 1, 1995Publication History Published online1 May 200…
The solid–solid phase transitions and the crystal structures of odd n-alkanes, n-C23H48, and n-C25H52, were investigated by x-ray powder diffraction. The phase transitions, I→V→RI for n-C23H48 and I→V→IV→RI for n-C25H52, were observed, where phases I, V, IV are the low-temperature ordered phases, and the phase RI is t…
The dielectric, pyroelectric, electrostrictive, optical and thermal properties of Na0.5Bi0.5TiO3, in wide temperature range, particularly in the range of 200–340[ddot]C are presented and discussed. The results of investigations show the complicated nature of phase transition occurring in this material.
The CobU protein of Salmonella typhimurium was overexpressed and purified to approximately 94% homogeneity. N-terminal sequencing of purified CobU confirmed the first 22 amino acids. In vitro assays showed that CobU has kinase and guanylyltransferase activities which catalyze the synthesis of adenosyl-cobinamide-GDP f…