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。
The Hohenberg-Kohn theorem of density functional theory (DFT) for the case of electrons interacting with an external magnetic field (that couples to spin only) is examined in more detail than previously. A unexpected generalization is obtained: in certain cases (which include half metallic ferromagnets and magnetic in…
We report scanning tunneling microscopy observations, which imply that all atoms in a close-packed copper surface move frequently, even at room temperature. Using a low density of embedded indium `tracer' atoms, we visualize the diffusive motion of surface atoms. Surprisingly, the indium atoms seem to make concerted,…
The building of multidimensional magnetic materials obtained with the molecular precursor [Cu(opba)](2-) is described. The reaction with other paramagnetic species (3d or 4f metal ions, organic radicals) yielded one-dimensional, two-dimensional, and interlocked networks. The magnetic properties of these systems are re…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAluminum Tris(2,6-diphenylphenoxide)-ArCOCl Complex for Nucleophilic Dearomatic FunctionalizationSusumu Saito, Toshihiko Sone, Masaaki Murase, and Hisashi YamamotoView Author Information Graduate School of Engineering, Nagoya University CREST, Japan Science and Technol…
In this paper, we address the issue of modeling the temperature distribution in a shape memory alloy (SMA) wire with variable thermal and electrical properties. This is done in the context of a one-dimensional (1D) boundary value problem where an initially martensitic SMA wire is electrically heated under zero-stress…
The concept of dendritic networks via four bis(2,2‘:6‘,2‘ ‘-terpyridine)ruthenium(II) connectivities was utilized to create “dendritic methane”-type metallomacromolecules. In addition, two structurally isomeric metallodendrimers ( 16 and 17 ) were designed, synthesized, and characterized. These two isomers were spectr…
A novel ligand based on a pyridine-containing macrocycle bearing two acetic and one methylenephosphonic arms (PCP2A) has been synthesized. An efficient synthesis of PCP2A is based on the macrocyclization reaction between 2,6-bis(chloromethyl)pyridine and a 1,4, 7-triazaheptane derivative bearing a methylenephosphonate…
Molybdenum disulfide ((MoS 2 ) n ) nanotubes are generated when polycrystalline MoS 2 powder, covered by Mo foil, is heated to ca. 1300 °C in the presence of H 2 S. Electron diffraction reveals the presence of zigzag arrangements within the tube walls.
Bis(tert-butylsilyl)decatungstophosphate (n-Bu4N)3[(gamma-PW10O36)(t-BuSiOH)2] (1) has been synthesized through phase-transfer conditions, by reaction of t-BuSiCl3 with Cs7[(gamma-PW10O36)].xH2O. This new hybrid anion has been characterized by elemental analysis, X-ray crystallography, multinuclear solution and solid-…
Spherical polyoxometalates (POMs) such as M 6 O 19 2 - and SiM 12 O 40 4 - (with M = Mo or W) and planar arene donors (anthracenes and pyrenes) can be cocrystallized (despite their structural incompatibility) by attaching a cationic “anchor” onto the arene which then clings to the POM anion by Coulombic forces. As a r…
We present a precise microscopic description of the limiting step for low temperature shape relaxation of two dimensional islands in which activated diffusion of particles along the boundary is the only mechanism of transport allowed. In particular, we are able to explain why the system is driven irreversibly towards…
The mineralized shell (consisting of calcium carbonate) of the tropical freshwater snail Biomphalaria glabrata was investigated with high resolution synchrotron X-ray powder diffractometry and X-ray absorption spectroscopy (EXAFS). Parts from different locations of the snail shell were taken from animals of different…
Porphyrins bearing specific patterns of substituents are crucial building blocks in biomimetic and materials chemistry. We have developed methodology that avoids statistical reactions, employs minimal chromatography, and affords up to gram quantities of regioisomerically pure porphyrins bearing predesignated patterns…
Novel ampholytic grafted polysaccharides were prepared by grafting the Zwitterionic monomer 2-(2-methacryloethyldimeth-ylammonio) ethanoate onto hydroxyethyl cellulose. Ethylenediamine tetraacetic acid was used in combination with ceric ammonium nitrate as the redox initiator. The effects of various factors such as in…
Spin probe rotational mobility has been studied by means of saturation transfer ESR in malto-oligomer−water glasses and has been compared to water mobility as measured by 1 H NMR. Increasing the water content from 10 to 30 wt % leads to a decrease in spin probe mobility at T g while the water mobility increases at T g…
The reactions of various derivatives of chelidamic acid (4-hydroxypyridine-2,6-dicarboxylic acid) with p-tert-butylcalix[4]arene have produced several new mono- and difunctionalized derivatives of the calixarene in which tridentate functional groups suitable for the binding of rare earth metal cations have been incorp…
Photoemission in the system of linear charged chains has been studied with the dipole matrix incorporated, from which its dependencies on the photoelectron momentum (${\bf k}$), photon polarization ($\hat{\bf E}$), and photon energy ($ω$) can be explored. The used model is the three-dimensional array of noninteracting…
Cuttlebone is a highly organized calcium carbonate biomineral with an elaborate macroporous architecture consisting of mineralized sheets and supporting wall structures that are constructed on a β-chitin matrix (figure). Removal of the calcium carbonate by demineralization results in an intact polysaccharide matrix th…
Reversible anion binding in aqueous media at chiral Eu III and Tb III centers has been characterized by 1 H NMR and by changes in the emission intensity and circular polarization following direct or sensitized (365 nm) excitation via an alkylphenanthridinium chromophore. Using a series of heptadentate tri-amide or pol…
In this paper the problem of the Mott metal-insulator transition in vanadium dioxide driven by an external electric field is considered. Delay time ( t d ) measurements have shown that the experimental value of t d is almost three orders of magnitude lower than the theoretical value, calculated in a simple electrother…