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 study the effect of a single nonmagnetic impurity on the recently discovered (K,Tl)Fe(x)Se(2) superconductors, within both a toy two-band model and a more realistic five-band model. We find that, out of five types of pairing symmetry under consideration, only the d(x(2)-y(2))-wave pairing gives rise to impurity res…
We present evidence for a concomitant structural and ferroelectric transformation around ${T}_{S}\ensuremath{\sim}360$ K in multiferroic BiFeO${}_{3}$/LaAlO${}_{3}$ thin films close to the tetragonal phase. Phonon excitations are investigated by using Raman scattering as a function of temperature. The low-energy phono…
Nitrogen-doped bamboo-structured carbon nanotubes have been successfully grown using a series of cobalt/molybdenum catalysts. The morphology and structure of the nanotubes were analysed by transmission electron microscopy and Raman spectroscopy. The level of nitrogen doping, as determined by X-ray photoelectron spectr…
Two types of new pyridine-based azo dyes, namely, 4-(3′-pyridylazo)-4″-alkoxybenzoates with various alkoxy chains and 4-(3′-pyridylazo)-4″-substituted benzoates bearing groups of different polarities, were prepared and investigated for their mesophase behaviour by differential scanning calorimetry and polarised light…
The synthesis and self-organizing behaviour into liquid-crystalline mesophases of two libraries of segmented block co-dendrimers are described. The overall structure of the dendritic supermolecules consists of two chemically incompatible molecular moieties, covalently connected by combinatory cross-coupling reactions.…
The transport properties of a suspended carbon nanotube probed by means of a scanning tunnel microscope (STM) tip are investigated. A microscopic theory of the coupling between electrons and mechanical vibrations is developed. It predicts a position-dependent coupling constant, sizable only in the region where the vib…
We investigate the dynamic response of pristine and potassium-doped picene, the first example of a new family of organic molecular superconductors, by combining first-principles calculations and state-of-the-art experimental tools. We find that charge-carrier plasmons in K${}_{3}$ picene have a negative or almost negl…
The incredible bulk: Although nano-sized Au is required in numerous reactions, π-activated alcohols, such as benzyl alcohol and cinnamyl alcohol, can be catalytically oxidized by unsupported bulk Au, which provides a promising starting point to explore the origin of Au catalysis.
Recent ab initio studies have theoretically predicted room temperature ferromagnetism in several oxide materials of the type AO(2) in which the cation A(4+) is substituted by a non-magnetic element of the 1 A column. Our purpose is to address experimentally the possibility of magnetism in Ti(1-x)K(x)O(2) compounds. Th…
Abstract Ternary composites of glass fiber‐reinforced poly( p ‐phenylene sulfide) (PPS/GF) filled with nanometric calcium carbonate (nano‐CaCO 3 ) were prepared by means of a twin‐screw extruder. The nano‐CaCO 3 surface was treated with stearate and treated with titanate, the composites being called SI composite syste…
Titanium-carbide-derived carbons (TiC-CDCs) are porous $s{p}^{2}$-bonded networks synthesized by exposing TiC to chlorine gas at an elevated temperature. The latter ``chlorination temperature'' adjusts the size of the pores and the $s{p}^{2}$-bonded carbon domains within this material. We perform magnetoresistance, el…
The dimerization of receptors on the cell membrane is an important step in the activation of cell signaling pathways. Several methods exist for observing receptor dimerization, including coimmunoprecipitation, chemical cross-linking, and fluorescence resonance energy transfer (FRET). These techniques are limited in th…
Abstract The ac‐conductivity measurements carried out on (1 − x )NBT‐ x BiCrO 3 solid solution in the radio frequency range. The conductivity measurements suggest that with increase in BiCrO 3 content the electrical conductivity of sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 ) (NBT) increases. For x = 0.10 and 0.15 t…
This paper reports the study of structural, electrical, magnetic and optical properties of Gd-doped nickel ferrite nanoparticles in order to investigate the possibility of multiferroism. The NiGd 0.04 Fe 1.96 O 4 nanoparticles were prepared by a chemical route and characterized by various techniques. Doping with Gd io…
Studying the behavior of organic molecules adsorbed on graphene is an issue of special importance to exploit the full potential of graphene in future technology. Here we report on a scanning tunneling microscopy study in ultrahigh vacuum of the surface diffusion and initial stages of growth of a simple organic molecul…
Cadmium-doped zinc oxide CdxZn1−xO (x = 0, 0.05, 0.15 and 0.40) nanoparticles were synthesized by using a sonochemical method. The X-ray diffraction (XRD) patterns show that CdxZn1−xO nanoparticles keep a wurtzite structure up to x = 0.40. However, the lattice parameters a, c, and internal parameter u gradually increa…
Quantum yield is one of the most important properties of photochromic systems. Unfortunately, a lack of data at the solid state exists, because measurements are intrinsically not straightforward. A kinetic model describing the conversion of the photoactive species is reported and both analytic and numeric solutions ar…
Abstract Equimolar blends of poly( L ‐lactic acid) (PLLA) and poly( D ‐lactic acid) (PDLA) were obtained by solution casting from chloroform/methanol mixed solvents and analyzed using wide‐angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC) and polarizing optical microscopy. Chloroform and methanol…
We investigate oxidation and oxide growth on single-crystal copper surfaces using reactive molecular dynamics simulation. The kinetics of surface oxide growth are strongly correlated with the microstructure of the metal substrates. Simulating oxide layer growth along the (100), (110), and (111) orientations of crystal…
We report here on the adsorption and deposition of l -glutamic acid (Glu) on an amorphous silica and its subsequent thermal transformations. When adsorbed from aqueous solutions, Glu only has a low affinity for the silica surface but at high concentrations the adsorbed molecules serve as nuclei for the formation of sm…