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 report superconductivity in an iron-based layered oxy-pnictide LaOFeP. LaOFeP is composed of an alternate stack of lanthanum oxide (La3+O2-) and iron pnictide (Fe2+P3-) layers. Magnetic and electrical resistivity measurements verify the occurrence of the superconducting transition at approximately 4 K.
Our recent work on photon-stimulated desorption of alkali halide surfaces has been reviewed. Most of the experimental data are presented for the first time. This new material is supplemented with two examples of our work published previously (see Szymonski et al 1996 Surf. Sci. 363 229; 2002 Acta Phys. Pol. 33 2237).…
Rotation of the electrode during the electrochemical polymerization of delta4,4'-di-cyclopenta[2,1-b;3',4'-b']-dithiophene results in enhanced rates of film growth on the electrode and changes in morphology from dominantly fibrilar to globular structures. The impedance of the resulting films shows their ionic conducti…
We report here on an in‐situ synthetic method for the preparation of a metal‐polymer composite material. This technique offers a route to achieving an intimate contact between the polymer and the metal nanoparticles. Very small palladium nanoparticles (∼3 nm) are uniformly dispersed and highly stabilized throughout th…
In this paper we review a number of works on photon stimulated ion desorption (PSID) of hydrogen from various diamond surfaces. In particular, we elaborate on the bonding configuration of adsorbed hydrogen (deuterium) and its neighbouring atoms, and its thermal stability in surface and sub-surface regions. Usage of hy…
The synthesis and structural characterization of new layered rare-earth silicates K(3)[M(1-a)Ce(a)Si(3)O(8)(OH)(2)], M = Y(3+), Tb(3+), a << 1 (AV-22 materials), have been reported. These materials combine the properties of layered silicates, such as intercalation chemistry, and photoluminescence and may find applicat…
A probe beam deflection (PBD) study of ion exchange between an electroactive polymer poly(allylamine)-bipyridyl-pyridine osmium complex film and liquid electrolyte is reported. The PBD measurements were made simultaneously to chronoamperometric oxidation-reduction cycles, to be able to detect kinetic effects in the io…
The triple-helix structure of grafted collagen is reinforced with bimetallic Al2O3–ZrO2 nanoparticles (see figure), thereby significantly improving the mechanical and thermal stability of the polymer matrix. The stability of this hybrid nanocomposite is thought to derive from the chemical bonding between the surface o…
To improve the physico‐mechanical and chemical resistance properties, lower the curing temperature of annona squamosa and pongamia glabra seeds oils based polyesteramides [ASPEA, PGPEA], as well as to convert the non‐edible seed oils into value added products, their respective alumina‐incorporated polyesteramides resi…
We investigate the effects of erbium doping on SnO(2) nanoclustering in Sn-doped silica. Vibrational spectroscopy data from Raman and infrared absorption measurements show nanostructuring effects on the SnO(2) nanophase. Ultraviolet absorption spectra evidence a gap shift ascribable to size-dependent quantum confineme…
We report absorption spectra for Ag(7), Ag(9), and Ag(11) in an argon matrix grown at a temperature of 28 K and compare them with previous spectra of the same species measured in matrices of argon grown at lower temperatures as well as in neon matrices. We discuss the discrepancies in the light of the matrix crystalli…
The anionic conjugated polymer poly{1,4-phenylene[9,9-bis(4-phenoxybutylsulfonate)]fluorene-2,7-diyl} (PFP-SO 3 - ) can form a complex with cationic quencher 4-(trimethylammonium)-2,2,6,6-tetramethylpiperidine-1-oxyl iodide (CAT1) through electrostatic interactions. The fluorescence of PFP-SO 3 - is efficiently quench…
The binary nitride ${\mathrm{Cu}}_{3}\mathrm{N}$ is a semiconductor with a rather open, cubic crystal structure built up from rigid, perpendicular Cu-N-Cu covalent bonds. It has been reported experimentally that the voids in this structure can be filled with Pd atoms and that one ends up with $\mathrm{Pd}{\mathrm{Cu}}…
Based on gradient-corrected density-functional theory and genetic global optimization approach that directly searches for the configuration of greatest stability, we are able to find particularly stable structures for binary gallium arsenide clusters. We report a formation of fullerenelike ${\mathrm{Ga}}_{n}{\mathrm{A…
Abstract In this work dynamic and steady‐state CH 4 partial oxidation tests, performed in an insulated lab‐scale reactor over a Rh‐based catalyst supported onto Al 2 O 3 spheres, are presented and discussed. To gain insight in the complex observed phenomena a previously developed 1D heterogeneous mathematical model of…
We investigated the nanoscale tribological properties of a decagonal quasicrystal using a combination of atomic force microscopy and scanning tunneling microscopy in ultrahigh vacuum. This combination permitted a variety of in situ measurements, including atomic-scale structure, friction and adhesion force, tip-sample…
The synthesis of a series of soluble poly(2,7-phenanthrylene)s and poly(3,6-phenanthrylene)s is presented. Depending on the nature of the repeat units they constitute analogues of poly( p -phenylene) (PPP) and poly( p -phenylenevinylene) (PPV) and thus should give rise to different modes of extended π -conjugation. In…
We studied the electrochemical and spectroscopic properties of a series of extended silole-based chromophores to understand the effect of structure on behavior. By changing the substituents attached to the chromophore, we observed large variations in luminescence quantum efficiency (ca. 0-0.6), lambdamax for absorbanc…
Abstract The chemical structure of a water‐soluble polysaccharide, coded as TM3b, extracted from sclerotia of Pleurotus tuber‐rigium was analyzed to be a hyperbranched β‐ D ‐glucan with β‐(1→6), β‐(1→4), and β‐(1→3)–linked residues, with degree of branching (DB) of 57.6%. The results from size‐exclusion chromatography…
Paramagnetic lanthanide(III) complexes that contain hyperfine-shifted exchangeable protons offer considerable advantages over diamagnetic molecules as chemical exchange saturation transfer (CEST) agents for MRI. As part of a program to investigate avenues to improve the sensitivity of such agents, the CEST characteris…