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。
Ausgehöhlt: In einer eleganten Methode wandeln Lochfraß- und Ätztechniken einkristalline Pd-Nanowürfel in Nanokästchen (siehe SEM-Bild) und Nanokäfige um, ohne dass exotische Template erforderlich sind. Durch das Leeren der Innenräume der Pd-Nanostrukturen lassen sich Oberflächenplasmonenresonanz-Signale zwischen 410…
9, 16, or 27 [CpFe(μ3-CO)]4 clusters contain the title assemblies (see picture). The one-electron oxidation Fe4→Fe4+ of all Fe4 units appears as a single reversible cyclic voltammetry wave and was used in solution and with dendrimer-modified electrodes for oxo-anion recognition. ATP2− is selectively recognized and bet…
We present a recently developed ab initio method based on many-body perturbation theory to calculate the optical absorption spectrum of one-dimensional systems with helical symmetry. Our scheme involves a local, symmetrized basis set which allows for the calculation of large systems otherwise prohibitive in the standa…
Cerium oxide/montmorillonite layered silicate powder nanocomposites were synthesized electrochemically. The produced nanocomposites were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy. X-Ray diffraction shows the nanocomposites retain the face-centered cubic s…
The coordination ability of the electroactive TTF-based chelating ligand 5,5'-bis(4,5-bis(thiomethyl)-4'-carbamoyltetrathiafulvalene)-2,2'-bipyridine (L) has been tested with Cu(I) and Cu(II) centres. [(L)2Cu(I)](PF6), [(L)2Cu(II)](OTf)2 and [(L)Cu(II)(DMF)3](OTf)2 have been synthesized. A single-crystal X-ray analysi…
The fabrication of thermopiles suitable for thermoelectric cooling and energy generation using Bi 2 Te 3 and Sb 2 Te 3 as n- and p-type layers, respectively, is reported. The thin-film thermoelectric material deposition process , thin-film electronic characterization and device simulation is addressed. The thermoelect…
Tungstosilicat-Bausteine: Beim Ansäuern der monomeren Spezies [SiW9O34]10− entstehen die dimeren Anionen α-[{K(H2O)2}Si2W18O66]15−. Zwei dieser Anionen können direkt (siehe Bild) oder, in Gegenwart von Kieselsäure, über einen elektrophilen [Si4O4]8+-Ring miteinander verknüpft werden.
The density-matrix renormalization group is used to study the pairing when both electron-electron and electron-phonon interactions are strong in the Holstein-Hubbard model at half filling in a region intermediate between the adiabatic (Migdal's) and antiadiabatic limits. We have found (i) the pairing correlation obtai…
Ligand Field Molecular Mechanics (LFMM) parameters have been optimised for six-coordinate Cu(II) complexes containing amine, pyridine, imidazole and pyrazine donors. As found in previous LFMM applications, the new parameters automatically generate distorted structures with the magnitudes of the Jahn-Teller elongations…
Crystalline styrene−butadiene−styrene (SBS) triblock copolymers consisting of elastic cis -polybutadiene ( cis -PB) chemically bonded with crystallizable syndiotactic polystyrene ( syn -PS) were synthesized through a stereospecific sequential triblock copolymerization of S with B catalyzed by C 5 Me 5 TiMe 3 /B(C 6 F…
Reconstruction of extracellular matrix substrates for delivery of functional photoreceptors is crucial in pathologies such as retinal degeneration and age-related macular degeneration. In this study, we assembled polyelectrolyte films using the layer-by-layer deposition method. The buildup of three different films com…
Partial discharge (PD) measurement is a proven flaw detection technique for finding cavities that are defects in the insulating material. In this paper, a novel approach for the classification of cavity sizes, based on their maximum PD charge transfer-applied voltage (/spl Delta/Q-V) characteristics using a fuzzy deci…
Light-induced diffusion-controlled electron transfer is proposed as an underlying mechanism for the intermittency (power law and breakdown) of a single quantum dot and ensemble-averaged fluorescence decay. The intensity decay can be approximated to a stretched exponential expression. The physical links to the free ene…
We use tetrahedral microwave networks consisting of coaxial cables and attenuators connected by T -joints to make an experimental study of Wigner's reaction K matrix for irregular graphs in the presence of absorption. From measurements of the scattering matrix S for each realization of the microwave network, we obtain…
The strength of magnetoelectric (ME) coupling at 10Hz–3MHz has been measured in trilayers of Fe, Co, or Ni and lead zirconate titanate (PZT). The strongest ME coupling is measured for trilayers with Ni and the weakest in Co. Data on ME voltage coefficient αE versus bias magnetic field H for Fe–PZT–Fe show unique featu…
Abstract In this paper a detailed nature of the electrical potential barriers in ZnO based varistors are presented. The excellent nonlinear current–voltage ( I–V ) characteristic of these varistors is attributed to the potential barriers formed between the successive ZnO grains during the processing cycle. These grain…
We report the vibrational spectra of the carbonyl complexes of anionic gold clusters in the range of the CO stretching frequency as measured in the gas phase using IR multiple photon dissociation spectroscopy. The investigated complexes contain between 3 and 14 Au atoms and up to 7 CO ligands. Special attention is giv…
At the heart of the relaxor behavior lies the development of mesoscopic or intermediate range order and the low frequency or relaxation dynamics associated with it. To investigate this development, we have measured the Raman spectra of a $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ (PZN) singl…
The surface valence-band densities of states (DOS) of Pt(3)M (M=Ti,V,Cr,Fe,Co,Ni) polycrystalline alloys were investigated with ultraviolet photoemission spectroscopy. Upon annealing the ion-sputter-cleaned alloys at high temperatures, the observed valence-band DOS spectra clearly show the modified electronic structur…
The history of electron emission is reviewed from a standpoint of the work function that determines the electron emission capability and of applications in the fields of scientific instruments and displays. For years, in thermionic emission, a great deal of effort has been devoted to the search for low work function m…