Materials Literature
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An organic reagent-assisted method has been developed for the synthesis and assembly of copper sulfide, cadmium sulfide and silver sulfide nanocrystallites at low temperature under hydro- or solvothermal conditions. Nanowire-like aggregates (with an average diameter of 120 nm and length of 2 μm) assembled by digenite…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRegioregular Poly(4-alkylquinoline)s: Synthesis, Self-Organization, and PropertiesYan Zhu, Maksudul M. Alam, and Samson A. JenekheView Author Information Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750 Cit…
This work describes the synthesis and the conformational properties of new polymethylated macrocyclic ligands of potential interest for magnetic resonance imaging. M4cyclen, (2S,5S,8S,11S)-2,5,8,11-tetramethyl-1,4,7,10-tetraazacyclododecane, was obtained by cyclotetramerization of (2S)-1-benzyl-2-methylaziridine follo…
We have employed the first-principles molecular dynamics method to study the stabilities and electronic properties of bismuth nanotubes. There are some stable bismuth nanotubes. The strain energies of Bi( n , n ) nanotubes follow the classical 1/ D 2 strain law. For small Bi( n , 0) nanotubes, the strain energies show…
The figure of merit ZT of thermoelectric materials has been evaluated by the Harman method in the temperature region below room temperature. In this method only resistance measurements by both dc and ac methods are required to obtain the ZT values. ZT is given by ZT =( R dc / R ac -1)/ x , where R dc , R ac and x are…
Ag(2)Cu(2)O(3) is the first known silver copper oxide. It was prepared by coprecipitation at room temperature and ambient pressure and shows an increased thermal stability compared with silver oxides. The crystal structure (tetragonal, a = 5.8862(2) A, c = 10.6892(4) A, Z = 4, I4(1)/amd) was refined from neutron and X…
How are the properties of a metal changed by strong inelastic scattering? We investigate this question within the two-dimensional t-J model using extended dynamical mean field theory and a generalized noncrossing approximation. Short-ranged antiferromagnetic fluctuations lead to a strongly incoherent single particle d…
Frequency Modulation Response of a Tunable Birefringent Mode Nematic Liquid Crystal Electrooptic Device Fabricated by Doping Nanoparticles of Pd Covered with Liquid-Crystal Molecules, Yoshikawa, Hiroaki, Maeda, Kenji, Shiraishi, Yukihide, Xu, Jun, Shiraki, Hiroyuki, Toshima, Naoki, Kobayashi, Shunsuke
The magnetic and electronic transport properties and the specific heat of La 1- x Ca x CoO 3 (0.05≤ x ≤0.5) have been investigated. In the whole composition range, the Co atoms are in an intermediate-spin (IS) state, and a spin glass or a ferromagnetic ordered state appears at low temperatures. The conductivity increa…
Self-assembled nanoporous materials have potential for many applications. Here we report unusual dendritic crystals from self-assembled nanoporous silicates and continuous morphological change of such materials through chemical means. We used hybrid organic silane and quaternary ammonium surfactants to prepare large d…
Rutile VO 2 nanorods have been synthesized by the precursor morphology controlled formation. The precursor single-crystal VO 2 hydrate nanorods have been obtained via the hydrothermal reaction of KOH, V 2 O 5, and hydrazine in a sealed autoclave at low temperature. The reducing agent N 2 H 4 plays a key role in the co…
Nitrogen (N) doping in ZnO is studied to realize reproducible p-type conductivity. Undoped ZnO layers prepared on a-face of sapphire substrates with H 2 O vapor-assisted growth showed n-type conductivity. However, N-doped ZnO (ZnO:N) layers grown in the similar manner showed the type conversion to p-type conductivity.…
The effect of ultrasonic vibration in the Reynolds number ( Re ) range of 1500 to 6000 on fluid flow in a square channel was investigated experimentally. An ultrasonic transducer was fixed at the center of the bottom of a square test channel, and a standing wave field was formed in this channel. The velocity of the fl…
We have investigated the interface effect on magnetic and transport properties in the superlattices composed of ferromagnetic La 1- x Sr x MnO 3 (LSMO) and non magnetic SrTiO 3 (STO) ( x = 0.2, 0.3, and 0.4). The interface of LSMO with STO was proved to show spin-canting, the degree of which critically depends on the…
The nonreducible mechanism of {(Ba 1- x Ca x )O} m TiO 2 ( m >1) ceramics fired in a reducing atmosphere was investigated by measuring the electrical conduction under various atmospheres at elevated temperatures. The high insulation resistance of the Ca-doped BaTiO 3 ceramics can be explained by the following three fa…
We design a new class of carbon-network materials with a periodically modified graphite sheet. The modified part corresponds to (6,6) carbon-nanotube geometry. Their tube parts form triangular lattice on graphite sheet. On these systems each tube has six heptagons at the bottom, giving rise to a seamless s p 2 -C netw…
A conventional high voltage wire-like plasma enhanced and spread by a pulsed microwave was used to study the oxidative coupling and reforming of CH 4 with CO 2 to CO, C 2 H 2, C 2 H 4, and H 2 . Under the conditions of atmospheric pressure, a flow rate of 200 mL/min (CH 4 /CO 2 = 1.5:1), peak microwave power of 120 W,…
M4DOTA, [(2S,5S,8S,11S)-4,7,10-tris-carboxymethyl-2,5,8,11-tetramethyl-1,4,7,10-tetraazacyclododecan-1-yl]acetic acid (2e), and M4DOTMA, (R)-2-[(2S,5S,8S,11S)-4,7,10-tris-((R)-1-carboxyethyl)-2,5,8,11-tetramethyl-1,4,7,10-tetraazacyclododecan-1-yl]propionic acid (3e), are derivatives of ligand DOTA (1e) that form ster…
Hydrated rare earth hexaborates H 3 LnB 6 O 12 (Ln = Sm−Lu) have been synthesized by using molten boric acid as the reaction medium. H 3 LnB 6 O 12 decomposes at certain temperatures to form anhydrous pentaborates LnB 5 O 9 (Ln = Sm−Er) or orthoborates LnBO 3 (Ln = Tm−Lu). The crystal structures of the hexaborates and…
Exposure of thin films of as-prepared single-walled carbon nanotubes (SWNT) to nitric acid induces dramatic bleaching of the first and second interband transitions of semiconducting tubes (S1 and S2). These near-IR absorption features can be restored by annealing of treated SWNT films to elevated temperatures. Anneali…