Materials Literature
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Nitrogen doped diamond-like carbon (DLC:N) films were prepared by electron cyclotron resonance chemical vapor deposition (ECR-CVD) on polycrystalline Si chips. Film thickness is about 50 nm. Auger electron spectroscopy (AES) was used to evaluate nitrogen content, and increasing N2 flow improved N content from 0 to 7.6…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDirect 3-D Imaging of the Evolution of Block Copolymer Microstructures Using Laser Scanning Confocal MicroscopyWonmok Lee, Jongseung Yoon, Hyunjung Lee, and Edwin L. ThomasView Author Information Department of Materials Science and…
CsSc[B2P3O11(OH)3] was obtained by hydrothermal synthesis and represents the first alkali-metal scandium borophosphate containing boron with coordination numbers 3 and 4. The crystal structure was determined from single-crystal X-ray data: orthorhombic, space group Pnna (No. 52), a=13.0529(15) A, b=18.3403(17) A, c=10…
The present density functional theory (DFT) calculations have clearly reproduced the experimental phenomena for low-temperature CO oxidation on the AuNi 3 (111) alloy surface. Our results indicate that the AuNi 3 (111) flat surface is also an effective candidate for the catalysis of CO oxidation due to its low activat…
Through the application of optically active second-harmonic generation measurements (OA-SHG) we have demonstrated that the adsorption of amino acids cysteine (HSCH(2)CHNH(2)COOH) and penicillamine (HSC(CH3)(2)CHNH(2)COOH) from solution can induce chiral electronic states in an initially achiral polycrystalline Au film…
This work presents, for the first time, a general mechanism of a rhombohedral (R)-triclinic (T) phase transition in Chevrel Phases (CPs) with small cations (radius<1 A), which was unclear in spite of intensive studies of these important materials in the past. In contrast to previous interpretation of the R<-->T transi…
This paper presents an analysis of the thermodynamics of a model glass former. We have performed equilibrium sampling of a popular binary Lennard-Jones model, employing parallel tempering Monte Carlo to cover the crystalline, amorphous, and liquid regions of configuration space. Disconnectivity graphs are used to visu…
Main-chain liquid crystalline polymers that form low-temperature smectic mesophases are prepared by linking terephthalic acid, bis(4-allyloxyphenyl) ester (PPT) mesogens with 1,1,3,3,5,5-hexamethyltrisiloxane (F3) spacers via Pt-catalyzed hydrosilylation. Significant differences in thermal behavior and mesomorphic ord…
Variable-temperature 17O NMR experiments were conducted on the nanometer-sized Keplerate Mo72Fe30 cluster, with the stoichiometry [Mo72Fe30O252(CH3COO)12[Mo2O7(H2O)]2[H2Mo2O8(H2O)](H2O)91]. approximately 150H2O. This molecule contains on its surface 30 Fe(H2O) groups forming a well-defined icosidodecahedron, and we es…
Abstract The pristine multiwalled carbon nanotubes (MWCNTs) without oxidation or covalent decoration were homogeneously coated with silica through a simple modified sol–gel method.
In this paper we have presented the calculation of pair correlation functions in a nematic phase for a model of spherical particles with the long-range anisotropic interaction from the mean spherical approximation (MSA) and the Percus-Yevick (PY) integral equation theories. The results found from the MSA theory have b…
We have performed theoretical calculations to predict the stability and electronic structure of GaAs nanotubes. We have studied the variation of strain energy, radial distribution, buckling, Mulliken pupulation, density of states, and band gap as functions of both radius and helicity of the tube. The strain energies o…
Abstract A tetrathiafulvalene (TTF) derivative with a cytosine moiety was designed and synthesized as a bi-functional molecule with both electron-donating and proton-accepting abilities. In the crystal of I3− salt, TTF–cytosine dyad formed a hemiprotonated dimer through triple hydrogen-bonds with radical cationic stat…
Nanoporous silica films were prepared by sol-gel process with base, acid and base/acid two-step catalysis. Transmission electron microscope (TEM) and particle size analyzer were used to characterize the microstructure and the particle size distribution of the sols. Scanning electron microscopy (SEM), atomic force micr…
The interaction of NO 2 with single-walled C nanotubes and highly oriented pyrolitic graphite was studied at different temperatures by using high-energy resolution core level photoemission spectroscopy. During NO 2 uptake below 200 K, the C1s peak exhibits a similar behavior for the two samples and correspondent NO x…
Quantum dot (QD)/polymer composite films were prepared by solvent casting suspensions of CdSe/ZnS semiconductor nanoparticles in cellulose triacetate (CTA) solution. The common solubilities of the organic ligands capping the QDs and of the polymer permitted the direct addition of QDs into the CTA casting solution. The…
The first demonstration of the directed assembly of cylindrical microdomains of a block copolymer into nonregular, patterned structures, as well as the subsequent formation of registered 1D arrays of spherical microdomains and nanoparticles, is presented. Directed assembly of pure cylinder-forming polystyrene- block -…
A density functional study using isolated cluster models of the zeolite framework (Vayssilov, G. N.; Rösch, N. Phys. Chem. Chem. Phys. 2005, 7, 4019) on supported metal clusters M 6 /zeo in a hydroxylated faujasite cage showed that for 12 metals M of the groups 8−11 the hydrogenated state, M 6 (3H)/zeo, is energetical…
Local structures around a bismuth ion in bismuth‐doped silica glasses (BiSG) are analyzed using a Bi L III X‐ray absorption fine structure (XAFS). The XAFS spectrum of crystalline α‐Bi 2 O 3 was also measured for comparison with BiSG whose first peaks are about 0.1 Å less than α‐Bi 2 O 3 in radial structure functions.…
The perovskite manganites CaMn 1 - x W x O 3 are studied up to the solubility limit by using transmission electron microscopy, X-ray powder diffraction, and magnetic and transport measurements. The phase diagram shows three compositional regions at low temperatures. As x increases, (i) regular Pnma perovskite structur…