Materials Literature
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Novel structural arrangements for carboxylic acid modified titanium alkoxides were obtained from stoichiometric reactions between titanium isopropoxide (Ti(OPr(i))(4)) and formic acid (HOFc). The 1:1 reaction in toluene forms the tetranuclear species Ti(4)O(2)(OFc)(2)(OPr(i))(10), 1. The structure of 1 was solved in t…
The nickel(II) complex with H 2 saltMe, a N 2 O 2 Schiff base ligand derived from salicylaldehyde, was oxidatively electropolymerized on Pt electrodes in CH 3 CN/0.1 mol dm -3 tetraethylammonium perchlorate (TEAP) to generate polymer films that exhibit reversible oxidative electrochemical behavior in a wide potential…
Tetrametallic molecular rectangles have been synthesized by combining rhenium(I) thiolate dimers with difunctional pyridyl and pyrazyl type ligands. The proposed rectangular structures are supported by 1H NMR, MS, and IR absorption measurements. In addition, crystal structures of two of the rectangles are presented sh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransformation of Germanium Dioxide to Microporous Germanate 4-Connected NetsHailian Li and O. M. YaghiView Author Information Department of Chemistry and Biochemistry Arizona State University, Tempe, Arizona 85287-1604 Cite this: J. Am. Chem. Soc. 1998, 120, 40, 10569…
The use of mild hydrothermal methods to synthesize vanadium oxides is reviewed, with particular emphasis on those with layer and 3-dimensional structures. A wide range of studies has been performed predominantly in the past decade to grow new materials that might have interesting electrochemical and magnetic propertie…
Proximity effects of 20 Åthin Fe layers on the spin density waves (SDWs) in epitaxial Cr(001) films are revealed by neutron scattering. Unlike in bulk Cr we observe a SDW with its wave vector Q pointing along only one {100} direction which depends dramatically on the film thickness t_{Cr}. For t_{Cr} < 250 Åthe SDW pr…
The adsorbed amount and the hydrodynamic layer thickness of two series of block copolymers and the corresponding homopolymers on silica were determined. We used diblock copolymers of poly(vinyl methyl ether) and poly(2-ethyl-2-oxazoline) and tri- and diblock copolymers of poly(2-methyl-2-oxazoline) and poly(ethylene o…
A theoretical study of the structural parameters, interaction energies, and bonding mechanism of CO and NO to a Pd center located in two copper-rich bimetallic PdCu(111) surfaces and several coordination positions of the Pd(111) surface is reported. For CO, the bonding nature is predominantly covalent, and the analysi…
Self-consistent field theory is used to investigate the density profile of diblock copolymer melts in a thin film confined between two surfaces, one of which carries a chemically active pattern. The temperature is slowly lowered through the critical point in order to obtain well organized structures. For strong surfac…
We studied the thermodynamics in a single homopolymer chain using a multicanonical Monte Carlo simulation. A polymer chain that exhibits an elongated coil state in a good solvent, or at high temperatures, collapses into a condensed state, i.e., coil–globule transition. For flexible polymer chains, as the temperature d…
Within the framework of a study on the properties of carbon nanotubes, a promising new material, we performed numerical simulation of hydrogen adsorption at room temperature in single-walled nanotubes. The structure of this material is favorable to the adsorption phenomenon because of the narrow size distribution of t…
A surface-controlled electro-optic device using a nematic liquid crystal enclosed between two thin spaced glass plates is presented. Modulation angles of the optic axis up to more than 70° can be achieved even for small applied voltages. The switching of the optic axis occurs with a large component in the plane of the…
The authors have succeeded in observing the dielectric anomaly in ferroelectric strontium bismuth tantalate (SBT) thin films, and studied how it varies with film composition. For a stoichiometric SBT film, the dielectric anomaly was diffused, and the Curie temperature (Tc) was approximately 260 °C, which is lower than…
A memory-type colour reflective display device is proposed. Introducing smectic liquid crystal to holographic polymer dispersed liquid crystal (HPDLC) successfully produced a memory function while keeping the advantages of HPDLC. This device is electrically writable and thermally erasable. It was able to maintain the…
A partial discharge model has been developed to simulate experimental partial discharge activity within electrical tree structures grown in polymeric based insulation. A pin plane electrode arrangement and tree were defined on a grid representing an area 2 mm by 2.1 mm. A sinusoidal 50 Hz voltage was applied to the pi…
We have investigated transport properties across interfaces between the conducting ferromagnetic oxides SrRuO3, La0.5Sr0.5CoO3, La0.67Sr0.33MnO3, and the metals Nb, Al, Pd, and Au. The interface resistances range from smaller than 10−8 to 102 Ω cm2, depending on the choice of ferromagnetic oxide and metal. The three c…
In this letter, we report the results obtained on polycrystalline silicon thin films using Raman spectrometry in resonance with the silicon direct band gap. First, we show that accurate information about crystallites can be obtained in these experimental conditions, without any deconvolution of Raman spectra. Second,…
On illumination, selenium deposited on nanoporous n- transfers photogenerated electrons into . When p-CuCNS is coated on top of the selenium deposited on nanoporous n- , holes are directed into the p-CuCNS. A photovoltaic cell of nanoporous n- /selenium/p-CuCNS based on the above charge transfer process generates a ph…
Ethanol is known to form two different kinds of glassy state, namely a structural glass and a glassy crystal, both showing the same glass transition temperature . The molecular dynamics in the different phases (supercooled liquid/plastic crystal) and during the corresponding phase transition is studied by dielectric s…
We have investigated the effect of substrate temperature on the growth rate and properties of nanocrystalline diamond thin films prepared by microwave plasma-assisted chemical vapor deposition on (100) Si from a 1% methane (CH4) precursor in argon (Ar). In previous work we have shown that the carbon dimer C2 is the do…