Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We have performed a first-principles study of the structural and vibrational properties of the three low-pressure (cubic, tetragonal, and especially monoclinic) phases of ZrO2, with special attention to the computation of the zone-center phonon modes and related dielectric properties. The calculations have been carrie…
A variety of fullerene molecules are found to be fully packed in the interior space of a single-wall carbon nanotube (SWNT) and form a novel one-dimensional crystal with a regular intermolecular distance. Using electron diffraction, we have successfully measured the ``lattice constants'' for these crystals of various…
We prepared polycrystalline samples of NaCo2-xMxO4 substituted for the Co site by other 3d or 4d elements (M=Mn,Cu, Zn, Ru, Rh, and Pd). While some of the elements (M=Mn,Ru and Rh) act as a strong scatterer to give rise to a rapid increase in resistivity, the others (M=Cu, Zn and Pd) do not deteriorate the electric co…
Diffraction patterns for polydisperse systems of crystalline grains of cubic materials were calculated considering some common grain shapes: sphere, cube, tetrahedron and octahedron. Analytical expressions for the Fourier transforms and corresponding column-length distributions were calculated for the various crystal…
The broad, intense peak found near 29 kDa in the laser-desorption mass-spectral abundances of various aurothiol (Au: SR) cluster compounds has been used to optimize the preferential formation of the species in that mass range. Recrystallization gives enriched fractions, on the 10 mg scale, that in several cases appear…
This paper examines the hypothesis that surfaces resistant to protein adsorption should also be resistant to the adhesion of bacteria ( Staphylococcus aureus, Staphylococcus epidermidis ) and the attachment and spreading of mammalian cells (bovine capillary endothelial (BCE) cells). The surfaces tested were those of s…
The fundamental physical properties of doped ${\mathrm{LaMnO}}_{3},$ generically termed ``manganites,'' and much of the underlying physics, were known more than 40 years ago. This article first reviews progress made at that time, the concept of double exchange in particular, and points out the missing elements that ha…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Homo- and Heteroprotected Furcated Units for Modular ChemistryAdi Dahan and Moshe PortnoyView Author Information School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel [email protected]Cite this: J. O…
The multiwavelength anomalous diffraction (MAD) method for phase evaluation is now widely used in macromolecular crystallography. Successful MAD structure determinations have been carried out at the K or L absorption edges of a variety of elements. In this study, we investigate the anomalous scattering properties of u…
The photoreaction of xanthone in an alcoholic solution flowing through a column reactor filled with the mesoporous silica MCM-41 was performed. It was found that the product yields depend greatly on both the pore size of the filler and the nature of the solvent. The product yields of this reaction, which involves a pa…
Abstract A complex of trivalent lanthanum stearate with stearin (REC) was used as a surface modifier to treat calcium carbonate, and its efficacy was assessed. The measurement of the viscosity of a CaCO 3 /liquid paraffin suspension demonstrated that REC treatment could considerably improve the dispersion of filler in…
Mode contributions of different collective excitations to the density-density time correlation function in liquid lead are studied within the nine-variable approach of generalized collective modes. It is shown, that a kinetic relaxing mode, caused by slow density fluctuations, defines almost completely the shape of de…
The structures of a series of strained in -cyclophanes, for which good X-ray data are available, were calculated by using a variety of ab initio and hybrid density functional (HDFT) methods. The HDFT methods were found to overestimate systematically the transannular nonbonded contact distances in these molecules. A co…
Abstract The effect of sodium carbonate on the Mooney scorch time and cure index of epoxidized natural rubber (ENR 50) was studied with concentrations of 0–2 phr and 100–160°C temperatures. A conventional vulcanization system based on an ASTM formulation was used throughout the investigation on the gum and carbon blac…
Abstract Blends of poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) with and without a compatibilizing agent were studied. Both materials are widely used in the soft drink bottle industry. The compatibilizing agent was a copolymer of ethylene and methacrylic acid partially neutralized with zinc…
We report structural, magnetic, and magnetotransport properties of the two-dimensional chromium sulfide ${\mathrm{Cr}}_{2}{\mathrm{S}}_{2.92},$ which contains both ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Cr}}^{2+}$ ions. Below its magnetic-ordering temperature ${(T}_{N}=118 \mathrm{K}),$ ${\mathrm{Cr}}_{2}{\mathrm{S}}_{2.9…
Abstract Random copolymer layers are surprisingly effective at reinforcing polymer–polymer interfaces. One hypothesis is that composition drift during synthesis can account for the higher than expected toughening. To test this hypothesis, we polymerized a series of poly( d ‐styrene‐ r ‐2‐vinylpyridine) (dPS f ‐ r ‐PVP…
A single crystal of gadolinium-doped SmAl(2) has zero magnetization in the midst of the ordered temperature region, despite the probable ferromagnetic spin ordering. The asymmetry in Compton-scattering intensity when switching between right- and left-handed polarization of incident 150-keV synchrotron radiation provid…
An adaptation of the Brownian dynamics simulation method has been used to model the growth of a particular 200-particle ensemble of silver nanoparticles. This ensemble of particles was randomly positioned on an electrode of total area 1.0 × 10 -9 cm 2, and these particles possessed a significant size distribution. The…
An Imaging-Plate (IP) camera for X-ray powder diffraction (XRPD) experiments was installed on the synchrotron radiation beamline GILDA at the ESRF. The IP camera can be used in fixed data-collection mode of the whole diffraction rings, or in translation mode for time-dependent experiments. The apparatus is ideal for c…