Materials Literature
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Transition metal oxides are widely used as both catalysts and catalytic supports in industrial processes. However, the mechanisms by which these materials function as catalysts and the structure−reactivity relationships are not well understood . In particular, there is a paucity of information on the specific sites re…
Angle-resolved photoemission is employed to measure the band structure of TiSe2 in order to clarify the nature of the ( 2 x 2 x 2) charge density wave transition. The results show a very small indirect gap in the normal phase transforming into a larger indirect gap at a different location in the Brillouin zone. Fermi…
Helices on helices: Nanohelices of polycrystalline cadmium sulfide (see transmission electron micrograph) have been made by the mineralization of helical self-assembled objects shaped like twisted ribbons. The coiled morphology of the inorganic helices apparently results from growth on only one face of the organic rib…
The engineering of tissue for mechanically demanding applications in the cardiovascular system is likely to require mechanical conditioning of cell-scaffold constructs prior to their implantation. Scaffold properties amenable to such an application include high elasticity and strength coupled with controllable biodegr…
Neutron diffraction with isotope substitution is used to determine the structures of high (HDA) and low (LDA) density amorphous ice. Both "phases" are fully hydrogen bonded, tetrahedral networks, with local order similarities between LDA and ice Ih, and HDA and liquid water. Moving from HDA, through liquid water and L…
This paper describes the functionalization of the surfaces of gold nanoshells, which consist of silica nanoparticles coated with a continuous thin layer of gold. Previous studies have shown that gold nanoshells exhibit optical properties similar to those of metal colloids (e.g., strong optical absorptions and large th…
Reversible electrochemical injection of discrete numbers of electrons into sterically stabilized silicon nanocrystals (NCs) (approximately 2 to 4 nanometers in diameter) was observed by differential pulse voltammetry (DPV) in N,N'-dimethylformamide and acetonitrile. The electrochemical gap between the onset of electro…
This article surveys recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties. The growth of ZnO nanowires was carried out in a simple chemical vapor transport and condensation (CVTC) system. Based on our fundamental understanding of the vapor–liquid–…
Acoustic waves have been extensively investigated and have had a practical significance in many different contexts. Seismology was one of the first areas where they were utilized and the substantial seismological literature, extending back to the nineteenth century, established many of the fundamental properties of acou…
La0.6Ca0.4CoO3 (LCCO) thin films were deposited on MgO(001) and stainless steel substrates by pulsed reactive crossed-beam laser ablation (PRCLA). The film stoichiometry was characterized by Rutherford backscattering spectrometry (RBS). The data confirmed that the material transfer from the target to the substrate is…
Synthesis, liquid-crystalline, and photophysical properties of a series of novel azopyridine-containing silver complexes have been described. Bis(4-phenyl,4‘-azopyridyl)-containing silver complexes exhibiting nematic, smectic, and cholesteric liquid-crystalline phases have been prepared. Photoisomerization of the azop…
The hydrogen bonding directed formation of a photochromic multilayer film was achieved on the basis of alternating assembly of poly(4-vinylpyridine) and poly(acrylic acid) bearing spironaphthoxazine. The assembling process was followed by UV−vis spectroscopy and X-ray diffraction measurement. Atomic force microscopy w…
On a solid surface a monolayer mixture may separate into two phases. The phases can self-assemble into a variety of patterns, with the feature size on the scale of 1--100 nm. This paper studies how the elastic anisotropy of the substrate affects the patterns. The substrate is taken to be of cubic crystal symmetry, alt…
We present an analytical theory on the heights of the quantum steps observed in the hysteresis loops of molecular magnets. By considering the dipolar interaction between molecular spins, our theory successfully yields the step heights measured in experiments, and reveals a scaling law for the dependence of the heights…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFour-Phase Triple Coaxial Cylindrical Microdomain Morphology in a Linear Tetrablock Quaterpolymer of Styrene, Isoprene, Dimethylsiloxane, and 2-VinylpyridineKeiko Takahashi, Hirokazu Hasegawa, Takeji Hashimoto, Vasilios Bellas, Herm…
The synthesis of seven monoazo benzotriazole dyes for use in surface enhanced resonance Raman scattering, SERRS, is reported. The dyes are all capable of complexing to the silver surface used to provide the surface enhancement found in SERRS and hence act as 'model' analytes. One dye was examined in detail and showed…
The crystal structures of two new metal-cyanide clusters with record high nuclearities are reported. A direct assembly reaction involving [(Me(3)tacn)Cr(CN)(3)] (Me(3)tacn = N,N',N"-trimethyl-1,4,7-triazacyclononane), NiI(2), and KCN in aqueous solution affords [(Me(3)tacn)(12)Cr(12)Ni(12)(CN)(48)](12+). The structure…
In an effort to study viscoelastic (vector) percolation and conductivity (scalar) percolation within a single system, we demonstrate a conducting polymer/solvent system, which upon gelation undergoes a viscoelastic transition, followed by a separate conductivity transition. Polyaniline doped by camphorsulfonic acid, i…
The adhesive power of the mussel is the reason that mussel adhesive proteins have been studied as a (model) system for a possible medical adhesive. After oxidation, the Dopa groups of the blue mussel ( Mytilus edulis ) foot protein Mefp-1 form Dopa−Dopa-quinone cross-links, which leads to the formation of aggregates.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAsymmetric Allylation Polymerization of Bis(allylsilane) and Dialdehyde Containing Arylsilane StructureToshihiro Kumagai and Shinichi ItsunoView Author Information Department of Materials Science, Toyohashi University of Technology, Toyohashi, 441-8580 Japan Cite this: Macromol…