Marie‐Laure Boillot、Jacqueline Zarembowitch、J. P. Itié 等 6 位作者2002-02-19New Journal of Chemistry
An attempt to rationalize the behaviour of iron(II) spin-crossover compounds under hydrostatic pressure at room temperature from a comparative analysis of data is reported. The selected pressure-induced spin transitions are those previously described for Fe(phen)2(NCS)2 [polymorphs I (a) and II (b)], Fe(py)2bpym(NCS)2…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesMetal-Catalyzed Oxygenation Mechanisms
Gitti L. Frey、K. J. Reynolds、Richard H. Friend2002-02-19Advanced Materials
Thin-film semiconducting devices containing inorganic as well as organic layers have been fabricated via solution processing (see Figure). Using high work function transition metal dichalcogenides (TMDCs) it is possible to reduce the barrier to hole injection into the polymer. A blocking barrier layer can be introduce…
Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchConducting polymers and applications
B. Mayers、Y. Xia2002-02-19Advanced Materials
Tellurium nanotubes with well-controlled structures (see Figure) are obtained via concentration depletion at the surfaces of seeds. The lengths of these inorganic nanotubes can be varied by adjusting the growth time (see cover), and the outer diameters of the tubes can be controlled by changing the initial concentrati…
Quantum Dots Synthesis And PropertiesAdvanced Thermoelectric Materials and DevicesChalcogenide Semiconductor Thin Films
Ram Chandra Singh、Jokhan Ram、Yashwant Singh2002-02-19Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We have calculated the pair-correlation functions of a fluid interacting via the Gay-Berne (n-6) pair potentials using the Percus-Yevick integral equation theory and have shown how these correlations depend on the value of n that measures the sharpness of the repulsive core of the pair potential. These results have be…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesPlant and animal studies
Josef Pola、Jaroslav Kupčík、Vratislav Blechta 等 8 位作者2002-02-19Chemistry of Materials
Pulsed IR laser-induced ablation of bulk poly[oxy(tetramethyldisilane-1,2-diyl)], [(CH 3 ) 2 Si(CH 3 ) 2 SiO] n,yields thin polyoxocarbosilane films whose polymeric structure consists of a backbone composed of −(CH 3 ) 2 Si(CH 3 ) 2 SiO− and −O(CH 3 ) 2 SiO− units, which is cross-linked via SiSiC 2 O, C 3 SiO, C 2 SiH…
Advanced ceramic materials synthesisSynthesis and characterization of novel inorganic/organometallic compoundsSilicone and Siloxane Chemistry
Jin Xianglin、Xiangjin Xie、Hua Xi Qian 等 7 位作者2002-02-19Chemical Communications
The cluster [Ag(SC6H2Pri(3)-2,4,6)]10 (1) contains a 20-membered ring of alternating silver and sulfur atoms, which is compactly folded; the sulfur atoms are doubly bridging and each silver atom exhibits linear two-coordination in the primary Ag-S interactions.
Organometallic Complex Synthesis and CatalysisMetal complexes synthesis and propertiesNanocluster Synthesis and Applications
O. Jost、A.A. Gorbunov、Jörg Möller 等 9 位作者2002-02-19The Journal of Physical Chemistry B
Four rate-limiting processes for the formation of single-wall carbon nanotubes (SWCNT) could be identified by varying furnace temperature, gas type, and pressure in a pulsed-laser evaporation setup. One rate-limiting process accounts essentially for all relevant gas-pressure dependencies and can be quantitatively desc…
Carbon Nanotubes in CompositesDiamond and Carbon-based Materials ResearchFullerene Chemistry and Applications
Zhihao Yuan、Hua Huang、Shanhui Fan2002-02-19Advanced Materials
Arrays of alumina nanopillars with adjustable dimensions (see Figure for a representative example) are fabricated by simple chemical etching of porous anodic alumina with dilute NaOH. The diameter and height of the pillars, as well as interpillar spacing, are a function of the oxide layer thickness, which is controlle…
Semiconductor materials and devicesNanowire Synthesis and ApplicationsAnodic Oxide Films and Nanostructures
Nadjet Ouali、Bernard Bocquet、Stéphane Rigault 等 6 位作者2002-02-19Inorganic Chemistry
Variable-temperature (1)H and (13)C NMR measurements of the D(3)-symmetrical triple-helical complexes [Ln(L1-2H)(3)](3)(-) (L1 = pyridine-2,6-dicarboxylic acid; Ln = La-Lu) show evidence of dynamic intermolecular ligand-exchange processes whose activation energies depend on the size of the metal ion. At 298 K, the use…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesAdvanced NMR Techniques and Applications
Eun Ju Bae、Wonbong Choi、Kwang Seob Jeong 等 7 位作者2002-02-19Advanced Materials
Highly ordered, vertical carbon nanotubes (CNTs) (see Figure) have been grown on a pre-patterned, porous anodic aluminum oxide (AAO) template using a lithographic patterning method and thermal chemical vapor deposition. The AAO template itself plays a catalytic role in CNT growth and the crystallinity of the CNTs is s…
Carbon Nanotubes in CompositesNanowire Synthesis and ApplicationsAnodic Oxide Films and Nanostructures
Jean‐Yves Raty、Vitaliy Godlevsky、J. P. Gaspard 等 9 位作者2002-02-19Physical review. B, Condensed matter
We examine the local atomic order as well as some dynamic properties of the semiconducting liquid GeTe. We employ hot-neutron two-axis diffraction at three temperatures above the melting point and compare these results with ab initio molecular dynamics simulations. The simulations were based on interatomic forces deri…
Advanced Thermoelectric Materials and DevicesChalcogenide Semiconductor Thin FilmsPhase-change materials and chalcogenides
Ayjamal Abdurahman、Alok Shukla、Michael Dolg2002-02-19Physical review. B, Condensed matter
In this paper we report first-principles calculations on the ground-state electronic structure of two infinite one-dimensional systems: (a) a chain of carbon atoms and (b) a chain of alternating boron and nitrogen atoms. Meanfield results were obtained using the restricted Hartree-Fock approach, while the many-body ef…
Graphene research and applicationsBoron and Carbon Nanomaterials ResearchSuperconductivity in MgB2 and Alloys
A. Martin、J. Clain、Axel Buguin 等 4 位作者2002-02-19Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We observe (by optical interferometry) the contact of a rubber cap squeezing a nonwetting liquid against a plate moving at velocity U. At low velocities, the contact is dry. It becomes partially wet above a threshold velocity V(c1), with two symmetrical dry patches on the rear part. Above a second velocity V(c2), the…
Surface Modification and SuperhydrophobicityFluid Dynamics and Heat TransferAdhesion, Friction, and Surface Interactions
V. N. Kislenko、L. P. Оliynyk2002-02-19Journal of Polymer Science Part A Polymer Chemistry
Abstract An influence of the structure of a globule of polyethyleneimine on the complex formation of one with the copper(II), nickel(II), and cobalt(II) ions is described. A change of the coordination number from the pH of solution for complexes of ethylenediamine, diethylenetriamine, and polyethyleneimine with metal…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesSynthesis and properties of polymers
Horng‐Tay Jeng、Guang‐Yu Guo2002-02-19Physical review. B, Condensed matter
The electronic structure and magnetocrystalline anisotropy energy of strained fcc ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ have been studied by using the linear muffin-tin orbital method within density functional theory. A uniaxial strain applied along the [001] direction of the magnetite is considered. It is found that th…
Magnetic Properties and Synthesis of FerritesMagnetic Properties and ApplicationsMagnetic Properties of Alloys
Masanori Ozaki、M. Kasano、D. Ganzke 等 5 位作者2002-02-19Advanced Materials
Laser action in a dye-doped ferroelectric liquid crystal (FLC)—at the edge of the photonic stop band—has been demonstrated for the first time. The FLC used is a multicomponent mixture with a well-controlled short pitch of its helical structure whose periodic is equivalent to visible optical wavelengths. The laser emis…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications
Antonio M. Puertas、Matthias Fuchs、Michael E. Cates2002-02-19Physical Review Letters
Using computer simulations, we identify the mechanisms causing aggregation and structural arrest of colloidal suspensions interacting with a short-ranged attraction at moderate and high densities. Two different nonergodicity transitions are observed. As the density is increased, a glass transition takes place, driven…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesTheoretical and Computational Physics
Mitsunori Yada、M. Mihara、S. Mouri 等 5 位作者2002-02-19Advanced Materials
Rare earth oxide nanotubes (see Figure) templated by dodecylsulfate assemblies have been fabricated for the first time by the homogeneous precipitation method using urea. Conversion into hollow nanotubes with an inner diameter of 3 nm and outer diameter of 6 nm can then be effected by anion exchange treatment to remov…
Carbon Nanotubes in CompositesMesoporous Materials and CatalysisLayered Double Hydroxides Synthesis and Applications
Konstantin Hadjiivanov、Helmut Knözinger、Mihail Mihaylov2002-02-19The Journal of Physical Chemistry B
Adsorption of CO on Ni−ZSM-5 reveals the existence of two kinds of Ni 2+ ions, with the respective stretching frequencies being at 2220 and 2212 cm -1 . The carbonyl complexes are resistant to evacuation at room temperature, which is explained by the high electrophilicity of cations in a ZSM matrix. At 85 K and in the…
Catalytic Processes in Materials ScienceZeolite Catalysis and SynthesisCatalysis and Oxidation Reactions
U. Jeong、H.-C. Kim、R.L. Rodriguez 等 8 位作者2002-02-19Advanced Materials
Thin polymer films with cylindrical microdomains of controlled size (see Figure for an AFM image) have been produced from diblock copolymer/homopolymer mixtures. It is demonstrated that not only do the spatial order and orientation of the domains remain unperturbed but also that two distinct sizes of pores can be acce…
Polymer Surface Interaction StudiesBlock Copolymer Self-AssemblyNanopore and Nanochannel Transport Studies