Materials Literature
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We present a theoretical framework based on a higher order density correlation function, analogous to that used to investigate spin glasses, to describe dynamical heterogeneities in simulated glass-forming liquids. These higher order correlation functions are a four-point, time-dependent density correlation function g…
To study the ion dynamics of several inorganic glasses, including single- and mixed-cation glasses, we have determined conductivity spectra over wide ranges in frequency. In the case of the single-cation glasses, these spectra extend from a few hertz up to the terahertz regime. The spectra show a transition from their…
Abstract We consider an anisotropic phase‐field model for the isothermal solidification of a binary alloy due to Warren–Boettinger ( Acta. Metall. Mater . 1995; 43 (2):689). Existence of weak solutions is established under a certain convexity condition on the strongly non‐linear second‐order anisotropic operator and L…
We have investigated Mn K edge resonant scattering from a single crystal of the bilayered manganite ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ in the charge/orbital ordered state $(T=170\mathrm{K}).$ A strong intensity enhancement of the tetragonal superlattice reflection $(\ensuremath{-}\frac{1}{4},\frac{…
Abstract Temperature‐modulated differential scanning calorimetry can detect a certain amount of reversible latent heat in flexible macromolecules. In short, one can identify a reversible melting in such polymers earlier thought to exhibit only fully irreversible crystallization and melting. Details of the reversible m…
Here we show that the longitudinal (L) and transverse (T) phonon densities of states can be extracted from linearly and circularly polarized Raman spectra. A test of the method for a-Si yields results consistent with the L and T densities of states inferred by analogy with the crystalline state. For a-SiO 2 , for whic…
Using ion implantation followed by pulsed-laser melting (PLM), we have synthesized ferromagnetic films of Ga 1-x Mn x As.Ion-channeling experiments reveal that these films are single crystalline and have high Mn substitutionality while variable temperature resistivity measurements reveal the strong Mn-hole interaction…
Abstract The structural change in the depth direction of a polyimide (UPILEX‐S) film treated in alkaline solution, which was a representative surface treatment used to form a seed layer for plating and to improve the adhesive strength, was analyzed by means of micro Fourier transform infrared attenuated total reflecti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Second Look at Polythieno[3,4-b]pyrazines: Chemical vs Electrochemical Polymerization and Its Effect on Band GapDon D. Kenning and Seth C. RasmussenView Author Information Department of Chemistry, North Dakota State University, Fa…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSonochemical Preparation of Nanoporous Composites of Titanium Oxide and Size-Tunable Strontium Titanate CrystalsJimmy C. Yu, Lizhi Zhang, Quan Li, Kwan Wai Kwong, An-Wu Xu, and Jun LinView Author Information Department of Chemistry and Environmental Science Program and Departme…
High-purity ZnO nanowires, which possess branching structures, were prepared by evaporating metal zinc onto thermally oxidized Si wafer. The morphology and microstructure analyses of ZnO crystals were performed by scanning electron microscopy and high-resolution transmission electron microscopy. The nanowires possess…
Spallation neutron diffraction and high-energy x-ray diffraction methods have been used to study CaO:Al 2 O 3 glasses at the 64:36 mol% eutectic and 50:50 mol% compositions. The samples were produced by the containerless cooling of liquid droplets heated by a laser beam and suspended in an aerodynamic levitator. The r…
The authors report ${}^{13}\mathrm{C}$ NMR and magnetization measurements on the magnetic state of oriented single crystals of the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Cl}.$ To understand these data a s…
Ternary (Ge 2 X 3 ) x (As 2 X 3 ) 1− x glasses with X = S or Se are of interest because they span a mean coordination number r in the 2.40 < r < 2.8 range that is characteristic of stressed–rigid glasses. We have examined X = S glasses in Raman scattering and T -modulated differential scanning calorimetry measurements…
Photocatalytic oxidation of CO to CO 2 was carried out with TiO 2 and Pt/TiO 2 catalysts at room temperature to investigate the effect of Pt deposition. The rate for CO photooxidation by Pt/TiO 2 was higher than that by TiO 2 . The reaction rate increased with incident light intensity to the power of 0.7 for Pt/TiO 2…
New poly(methacrylamide)s containing oligoaniline side chains were synthesized and characterized. Oligoanilines were prepared by palladium-catalyzed amination, followed by reaction with methacryloyl chloride to give methacrylamide monomers. Polymers were prepared by free radical polymerization. The polymers were prepa…
The ability to control the size and shape of nanoparticle assemblies is essential for the ultimate applications in sensors, catalysis, medical diagnostics, information storage, and quantum computation. This report demonstrates a novel mediator-template strategy toward this ability by exploring molecular driving forces…
A soluble photoreactive polyimide (PSPI) with side-group cinnamate (CI) chromophores that forms good quality films through conventional solution spin-casting and drying processes was successfully synthesized with a reasonably high molecular weight: poly(3,3‘-bis(cinnamoyloxy)-4,4‘-biphenylene hexafluoroisopropylidened…
Geometric parameters of NiO films epitaxially grown on Ag(001) were determined using two independent experimental techniques and ab initio simulations. Primary beam diffraction modulated electron emission experiments determined that the NiO films grow with O on top of Ag and that the oxide/metal interface distance is…
A new method for the preparation of SiO 2 /ZnO composite nanoparticles by the simplified controlled double-jet precipitation technique is described. The transmission electron microscopic and scanning electron microscopic images of SiO 2 /ZnO show that ZnO is coated on the silica (SiO 2 ) surface as a thin layer or sin…