Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We give a physical picture of the low-energy sector of the spin 1/2 Heisenberg Kagome antiferromagnet (KAF). It is shown that Kagome lattice can be presented as a set of stars which are arranged in a triangular lattice and contain 12 spins. Each of these stars has two degenerate singlet ground states which can be cons…
Nitrogen acceptors are formed when undoped single crystals of zinc oxide (ZnO) grown by the chemical-vapor transport method are annealed in air or nitrogen atmosphere at temperatures between 600 and 900 °C. After an anneal, an induced near-edge absorption band causes the crystals to appear yellow. Also, the concentrat…
We demonstrate that angle-resolved soft x-ray spectroscopy can resolve absorption by inequivalent oxygen sites and by different orbitals belonging to the same site in NaV2O5. By rotating the polarization direction, we see a dramatic change in the absorption spectra at the oxygen K edge. Our theory identifies the detai…
We have developed a simple and reliable technique for two-terminal transport measurements of free-standing wire-like objects. The method is based on the low-energy electron point source microscope. The field emission tip of the microscope is used as a movable electrode to make a well-defined local electrical contact o…
[structure: see text] The synthesis, theoretical calculations, and crystallographic and electrochemical properties of fused perpendicular tetrathiafulvalene (TTF) dimers incorporating both a TTF unit and a quinonoid pi-extended TTF are described as a new strategy for obtaining pi-extended, rigidified, and sulfur-rich…
In this paper, we describe a novel approach for fabricating an optoelectrochemical microring array. The array was fabricated by coating individual optical fibers of 25-microm diameter with a 1-microm layer of gold nanoparticles via electroless gold deposition. A SAM layer around the individual gold-coated imaging fibe…
Uncharged rods and disks have long been known to exhibit an isotropic to nematic phase transition on increasing density. In aqueous solution, however, such particles are generally highly charged, leading to repulsive electrostatic interactions. In this article the effect of adding salt to a monodisperse solution of th…
Carboxymethyldextrans of different charge densities have been attached to flat silicon wafer surfaces using plasma polymer interlayers in conjunction with two different chemical grafting strategies. The resultant coatings have been analyzed by XPS, to verify the surface coverage of the coatings and to estimate their d…
We report on the "molecular wiring" efficiency of glucose oxidase in organized self-assembled nanostructures comprised of enzyme layers alternating with layers of an osmium-derivatized poly(allylamine) cationic polyelectrolyte, acting as redox relays. Varying the relative position of the active enzyme layer in nanostr…
We describe our efforts toward the preparation of materials built with molecules possessing topologies analogous to those of macroscopic compasses and gyroscopes. Samples of 1,4-bis(3,3,3-triphenylpropynyl)benzene (3) were prepared by a simple two-step procedure from triphenylmethyl chloride (1) and 1,4-diiodobenzene.…
We prepared MgB$_{2-x}$Be$_{x}$ ($x=0$, 0.2, 0.3, 0.4, and 0.6) samples where B is substituted with Be. MgB$_{2}$ structure is maintained up to $x=0.6$. In-plane and inter-plane lattice constants were found to decrease and increase, respectively. Superconducting transition temperature $T_{c}$ decreases with $x$. We fo…
In a previous paper a method was developed to subtract the interactions due to periodically replicated charges (or other long-range entities) in one spatial dimension. The method constitutes a generalized "electrostatic layer correction" (ELC) which adapts any standard 3D summation method to slab-like conditions. Here…
The title complex, [CaZn2(C7H5O2)6(C10H14N2O)2], has a centrosymmetric molecule containing a linear array of two zinc and one central calcium ions bridged by two sets of three unsymmetrical benzoate ligands. Zinc is additionally coordinated by a nitrogen-base ligand to give distorted tetrahedral geometry, while the…
An efficient method for the preparation of 1,2,5-trisubstituted 4-imidazolidinones is presented. The synthetic approach is based on the formation of an N-[1-(benzotriazol-1-yl)alkyl] moiety on the amino group of a MBHA resin-bound amino acid. The nucleophilic substitution of the benzotriazole group with an amidic nitr…
In this work, an improved solution for multilayer adsorption of linear species is presented. The particular case of multilayer dimer adsorption is dealt with in detail, and a new adsorption isotherm is obtained for determination of surface area and adsorption energy from experiments. From the comparison between the ne…
The Co and Fe sites have been probed in pristine and CO 2 -treated Sr 0.95 Ca 0.05 Fe 0.5 Co 0.5 O 3 - δ using emission (EMS) and transmission (TMS) Mössbauer spectroscopy and found to have different local oxygen coordination environments and, most probably, a layered arrangement in the lattice. The EMS and TMS spectr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAnionic Polymerization of Macrocyclic α-(Alkoxymethyl)acrylates Leading to Novel Vinyl Polymer with Crown Ether Type Side ChainShigeki Habaue, Masatake Morita, and Yoshio OkamotoView Author Information Department of Applied Chemistr…
Polyanilines with liquid crystalline (LC) substituents, which consist of a flexible methylene spacer and phenylcyclohexyl moiety as a mesogenic core, were synthesized. Polymerizations were performed using ammonium persulfate and perchloric acid as the catalytic system. The polymers were quite soluble in organic solven…
The excitation, emission, electron paramagnetic resonance, and Raman scattering spectra of as-prepared and aged Si wires, like porous silicon, have been examined. Atomic force microscope is used for the surface morphology investigation, as well as the study of this morphology connection with photoluminescence (PL) pec…
Homogeneous DNA hybridization assay based on the luminescence resonance energy transfer (LRET) from a new luminescence terbium chelate, N,N,N(1),N(1)-[2,6-bis(3'-aminomethyl-1'-pyrazolyl)-4-phenylpyridine]tetrakis(acetic acid) (BPTA)-Tb(3+) (lambda(ex) = 325 nm and lambda(em) = 545 nm) to an organic dye, Cy3 (lambda(e…