Materials Literature
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Fe,Cr base alloys protected by Cr 2 O 3 base oxidation scales are candidate materials for the metallic interconnect of solid oxide fuel cells (SOFC). The operating temperatures of such cells range between 800 and 950 °C. Cr 2 O 3 base oxide scales are necessary since they show sufficient electrical conductivity unlike…
Bis Thiourea Zinc Chloride (BTZC) a new semiorganic nonlinear optical material has been synthesized. The solubility studies have been carried out in the temperature range 30°- 55°C. Single crystals of BTZC have been grown by slow evaporation of saturated aqueous solution at room temperature. The lattice parameters of…
Adsorption complexes of palladium atoms on Fs, Fs+, Fs2+, and O2− centers of MgO(001) surface have been investigated with a gradient-corrected (Becke–Perdew) density functional method applied to embedded cluster models. This study presents the first application of a self-consistent hybrid quantum mechanical/molecular…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUnexpected Assembly of a Unique Cyano-Bridged Three-Dimensional Cu3Cr2 FerromagnetHui-Zhong Kou, Song Gao, Jing Zhang, Ge-Hui Wen, Gang Su, R. K. Zheng, and X. X. ZhangView Author Information State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-H…
We report an improved chromatographic purification of soluble single-walled carbon nanotubes (s-SWNTs) using gel permeation chromatography. Three fractions are separated by gel permeation chromatography, and the first fraction contains 74% of the s-SWNTs as detected by atomic force microscopy and UV and near-infrared…
We have observed the photoconductive response of film samples of single-walled carbon nanotubes for the first time. Two peaks in the photoconductivity excitation spectra around 0.7 and 1.2 eV are observed at room temperature, which can be interpreted as a photocurrent in semiconducting nanotubes. At a low temperature,…
The effects of matrix porosity on the mechanical properties of an all‐oxide ceramic composite are investigated. The porosity is varied through impregnation and pyrolysis of a ceramic precursor solution. Mechanical tests are performed to assess the role of the matrix in both matrix‐dominated and fiber‐dominated loading…
Density functional calculations in the generalized gradient approximation are used to study the transport properties of the clathrates Ba8Ga16Ge30, Sr8Ga16Ge30, Ba8Ga16Si30, and Ba8In16Sn30. The band structures of these clathrates indicate that they are all semiconductors. Seebeck coefficients, conductivities and Hall…
Raw and oxidized carbon nanotubes have been reacted with Vaska's complex. It has been found that Ir coordinates to these nanotubes by two distinctive pathways. With raw nanotubes, the process is through a η 2 -coordination process. With oxidized nanotubes, the reaction occurs by coordination through the increased numb…
Preface. Introduction. Diffusion Without Chemical Reaction. Diffusion and Reaction with Local Equilibrium. Diffusion and Nonequilibrium Reactions. Structure and Sizes of Atoms and Molecules. Diffusion and Reaction of Water in Silica Glass. Diffusion, Reaction, and Exchange of Water in Quartz. Diffusion and Reaction of…
Terminally grafted chains of poly(ethylene glycol) (PEG) and oligo(ethylene glycol) reduce protein adsorption and cell adhesion on material surfaces. However, previous studies showed that protein−PEG adhesion is induced by the application of pressure. Because polymer behavior can vary with the molecular weight, in thi…
Optical properties of ZnO quantum dots (QDs) capped with polyvinyl pyrrolidone (PVP) molecules have been investigated. It is demonstrated that surface modification by PVP can dramatically change the emission spectra of the ZnO QDs. At the optimized condition with a PVP/Zn2+ ratio of 3:5, the photoluminescence (PL) spe…
In this work a selection of octasubstituted phthalocyaninato zinc complexes were synthesized and their photochemistry studied. The substituents included cholesterol (3a), estrone (3b), naphthol (3c) and phenoxy groups substituted with CH 3 (3d), C ( CH 3 ) 3 (at two positions, 3e), C ( CH 3 ) 3 (3f), NO 2 (3g), NH 2 (…
PBT/organic montmorillonite (MMT) nanocomposites were prepared via melt intercalation and their nanostructure was characterized by means of X-ray diffraction and transmission electron microscopy. Nanocomposite formation requires sufficiently hydrophobic organically modified layered silicates, as well as the presence o…
The influence of confinement on morphology formation in copolymer systems is an important area of interest in theoretical research. We apply dynamic density functional theory to investigate the effect of pores on the morphology formation in a symmetric diblock copolymer system. The pore is represented by a perfect cyl…
Vertically aligned boron nanowires in self-assembled large-scale arrays with excellent uniformity and high density have been fabricated using radio-frequency magnetron sputtering of boron and B2O3 powder onto various substrates. The nanowires thus produced are several tens of micrometers long and 20–80 nm wide, with t…
Abstract Polymeric nano‐composites are prepared by melt intercalation in this study. Nano‐clay is mixed with either a polymer or a polymer blend by twin‐screw extrusion. The clay‐spacing in the composites is measured by X‐ray diffraction (XRD). The morphology of the composites and its development during the extrusion…
Nonlinear polymer topologies composed of cyclic and branched polymer segments are systematically classified by reference to constitutional isomerism in a series of alkanes (CnH2n+2), monocycloalkanes (CnH2n), and polycycloalkanes (CnH2n-2, CnH2n-4, etc). Thus, the total number of chain ends (termini) and of branch poi…
We establish the most general differential equations that are satisfied by the Fourier components of the electromagnetic field diffracted by an arbitrary periodic anisotropic medium. The equations are derived by use of the recently published fast-Fourier-factorization (FFF) method, which ensures fast convergence of th…
Nanosized tetragonal 3 mol% Y 2 O 3 ‐doped ZrO 2 powder was produced by hydrothermal precipitation from metal chlorides and urea sol followed by a washing–drying treatment and calcination. The effects on powder properties of powder washing by water and ethanol with subsequent centrifuging, with possible deagglomeratio…