Materials Literature
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The tiny Ag diffusion to MgCNi3 has been prepared by solid states reaction. Its structure was characterized by X-ray diffractometer (XRD). The results show that a small mount of Ag substitute for Ni sites, and much of Ag are in vacancy sites of the MgCNi3. We have further studied the surface properties of Ag-MgCNi3 us…
A method for the discrete particle simulation of of almost rigid, sharply edged frictional particles, such as railway ballast is proposed. In difference to Molecular Dynamics algorithms, the method does not require knowledge about the deformation-force law of the material. Moreover, the method does not suffer from num…
Aluminum hydroxides are the precursors of metastable aluminas which are used in many applications in industrial catalysis. They constitute a starting point for the understanding of transition processes and structures of metastable transition aluminas. Using first-principle density functional calculations, several poly…
The preparation and characterization of a series of closely related magnesium and zinc compounds are reported: LMg(N(i)Pr(2))(THF), 1; LZn(N(i)Pr(2)), 2; LMg(O(t)Bu)(THF), 3; LZn(O(t)Bu), 4; and LZn(OSiPh(3))(THF), 6; where L = CH(CMeNC(6)H(3)-2,6-(i)Pr(2))(2). Their dynamic solution behavior has been examined by vari…
Cluster physics is the foundation of the increasingly important field of nanotechnology. Clusters, ranging in size from a few to many millions of atoms, constitute a fascinating field of research in physics, chemistry and materials science. They are formed by most of the elements of the Periodic Table, and the types o…
It is now widely accepted that the magnetic transition in doped manganites that show large magnetoresistance is a type of percolation effect. This paper demonstrates that the transition should be viewed in the context of the Griffiths phase that arises when disorder suppresses a magnetic transition. This approach expl…
ADVERTISEMENT RETURN TO ISSUEPREVNoteGelation and Development of Liquid Crystalline Order during Cure of a Rigid-Rod EpoxySeunghyun Cho and Elliot P. DouglasView Author Information Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 Cite this: Macromolecules 2002, 35, 11,…
Abstract Poly[bis(glycine ethyl ester)phosphazene] (PGP) was blended with poly( D,L ‐lactide‐ co ‐glycolide) (80:20 by mole) (PLGA) and poly[sebacic anhydride‐ co ‐trimellitylimidoglycine)‐ block ‐poly(ethylene glycol)] (30:50:20 by mole) (PSTP) in various ratios using a solvent‐mixing technique. The in vitro degradat…
Surface topography is believed to be a factor affecting cellular morphology, proliferation, and differentiation. The effect of surface roughness in the micron to supramicron range has been investigated previously. In the current study, the influence of nanoscale surface roughness was examined in terms of its effects o…
The application of reaction calorimetry and process modelling to allow for the rapid and safe scale-up of a Vilsmeier formylation reaction to the pilot plant will be described. This transformation was a key step in the preparation of the backbone amide linker (the so-called “BAL” handle) for solid-phase chemistry. In…
We have measured electron emission from ${\mathrm{C}}_{60}^{\ensuremath{-}}$ ions in a storage ring. The ions were produced at room temperature and excited by absorption of photons with a total energy of 14 eV. The observed lifetime $(\ensuremath{\sim}0.6 \mathrm{ms})$ is consistent with detailed balance and a cross s…
The magnetic behavior of the oxo-bridged Cu(II) dinuclear complexes has been investigated using hybrid density functional methods (B3LYP) and a post-Hartree−Fock approach (difference-dedicated configuration interaction method, DDCI). Both methods confirm the strong ferromagnetic coupling predicted for such complexes a…
Organized silicalite-1 bodies with a regular system of macropores were prepared. The procedure includes two stages. In the first, self-assembly of monodisperse polystyrene spheres and silicalite-1 nanocrystals is induced by the slow evaporation of the solvent. In the second stage a hydrothermal treatment of the self-a…
Tetraethyl orthosilicate was hydrolyzed and polymerized in concentrated aqueous tetrapropylammonium (TPA) hydroxide solution at 0 and 10 °C and room temperature. The formation of silicate oligomers involved in the TPA-mediated self-assembly process of colloidal Silicalite-1 was investigated using 29 Si NMR. A pentacyc…
Abstract Thermoelectric devices have been investigated widely in order to transform a low temperature heat source to the electrical power. In this report, we proposed a knitted wire panel as a thermoelectric power generator. A thermocouple on the knitted wire panel was formed by knitting an alumel wire and a chromel w…
Abstract The effects of surface modification of silicas by plasma‐polymerization coating, together with modification using a silane coupling agent for a comparison on the dispersion and physical properties of styrene–butadiene rubber (SBR) are reported. The chemical compositions of the plasma‐polymerization coating we…
For the first time, we report high-resolution electron energy loss spectroscopy (HREELS) studies on fluorinated carbon nanotubes and nanofibers of various diameters. In addition, we have carried out high-resolution transmission electron microscope studies on the material, as well as HREELS elemental line scans, and el…
Abstract The structural and morphological characteristics of biaxially oriented polyamide 12 films are described on the basis of the results from differential scanning calorimetry, wide‐angle X‐ray diffraction (WAXD), polarized FT‐IR spectroscopy, and small angle X‐ray scattering (SAXS). The WAXD patterns of the orien…
Abstract Short sisal fiber (SF)‐reinforced polypropylene (PP) composites were prepared by melt blending followed by injection molding. To improve the interfacial bonding between SF and PP, the PP matrix was maleated (MAPP) by blending PP and maleic–anhydride‐grafted‐PP in the weight ratio of 9/1. It was found that the…
A ferromagnetic transition below 280 K is observed in the temperature variation of the magnetization, measured using high magnetic fields, for samples of ${\mathrm{LaMn}}_{0.5}{\mathrm{Ni}}_{0.5}{\mathrm{O}}_{3}$ synthesized by the high-temperature solid-state reaction method. On the other hand, two well-defined magne…