Nickel nanowires of 4 nm diameter in the cavity of carbon nanotubes
Nickel nanowires of 4 nm diameter were formed in the cavity of carbon nanotubes with an inner diameter of 20 nm.
Materials Literature
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Effect of temperature on cation disorder in ABi2Nb2O9 (A=Sr, Ba)
The influence of thermal annealing on cation disorder in ABi 2 Nb 2 O 9 (A=Sr, Ba) has been studied using synchrotron powder X-ray diffraction methods. BaBi 2 Nb 2 O 9 adopts a tetragonal (I4 1 /mmm) structure, whilst SrBi 2 Nb 2 O 9 is orthorhombic, space group A2 1 am, irrespective of the annealing conditions. In bo…
Mechano-catalysis—a novel method for overall water splitting
A novel finding of mechano-catalytic overall water splitting by metal oxides, a way to produce hydrogen by water decomposition, is reported. It was clearly revealed that some simple and mixed oxide powders such as NiO, Co3O4, Cu2O, Fe3O4, and CuMO2 (M=Al, Fe, Ga), when suspended in distilled water by magnetic stirring…
Surface-Enhanced Fluorescence on SiO 2 -Coated Silver Island Films
Fluorescence is one of the molecular spectroscopic properties that is enhanced by placing the molecule on the rough surface of a coinage metal. The surface-enhanced fluorescence (SEF) can be directly observed in steady-state fluorescence experiments. The observations are the results of a delicate balance between the e…
Synthesis of single-wall carbon nanotubesby catalytic decomposition of hydrocarbons
Individual single-wall carbon nanotubes (SWNTs) and bundles can be obtained over different types of supported metal catalysts by decomposition of ethylene, similar to the synthesis of multi-wall carbon nanotubes.
Growth of high-Tcthin films
An overview of the deposition and deposition techniques (with the emphasis on PVD techniques) of high- T c material is presented. The major technologies are discussed and compared, and advantages and problems of various substrate materials are illustrated. The consequences connected with lattice mismatch are discussed…
Compact laser molecular beam epitaxy system using laser heating of substrate for oxide film growth
A high-temperature, oxygen compatible, and compact laser molecular beam epitaxy (laser MBE) system has been developed. The 1.06 μm infrared light from a continuous wave neodymium-doped yttrium aluminum garnet (Nd:YAG) laser was used to achieve a wide range and rapid control of substrate temperature in ultrahigh vacuum…
Peanut Protein Film as Affected by Drying Temperature and pH of Film Forming Solution
ABSTRACT Films were made from peanut protein concentrate solution of pH 6.0, 7.5 or 9.0, and dried at 70, 80 or 90°C. Both total solubility and protein solubility of film decreased with increasing temperature but increased with increasing pH. Film color was darker and more yellow when pH increased. Tensile strength (T…
Superplasticity of Ultra-Fine Grained Al–Mg Alloy Produced by Accumulative Roll-Bonding
Fully annealed Al–Mg alloy (5083) bulk sheets were highly strained up to a true strain of 4.0 at 473 K by the novel Accumulative Roll-Bonding (ARB) process, and superplastic behavior of the ARBed sheets was investigated at elevated temperatures. Just before tensile tests, usual recrystallization structure whose mean g…
Structural approach of the features of the spin crossover transition in iron (II) compounds
We have determined the crystal structures, both in high and low spin state, of four Fe(PM-L) 2 (NCS) 2 complexes, where PM is N-2′-pyridylmethylene and the aromatic subunit L is 4-aminoterphenyl (TeA), 4-(phenylazo)aniline (AzA), 4-aminobiphenyl (BiA) or 4-(phenylethynyl)aniline (PEA). As previously reported, these co…
ZnS nanoparticles doped with Cu(I) by controlling coordination and precipitation in aqueous solution
A novel method for the synthesis of ZnS:Cu colloids has been studied in aqueous solution, in which the Cu + ions were incorporated into the ZnS matrix by the assistance of a sulfur-containing ligand, i.e. thiourea or thiosulfate. The optical properties of the colloids (absorption, emission and excitation spectra) were…
Synergistic and Catalytic Effects in Flame Retardancy of Polymeric Materials— An Overview
Synergistic and antagonistic effects of two or more additives are often encountered in flame retardancy of polymeric materials. Halo gen-antimony synergism is the best known. Evidence for bromine-ammonium, bromine-chlorine and bromine-phosphorus synergisms has been observed in some systems. Useful phosphorus-nitrogen…
Crystal structures and magnetic properties of the interpenetrating rutile-related compounds M(tcm)2 [M = octahedral, divalent metal; tcm− = tricyanomethanide, C(CN)3−] and the sheet structures of [M(tcm)2(EtOH)2] (M = Co or Ni)
The isomorphous structures of M(tcm)2 [MII = Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd or Hg; tcm– = tricyanomethanide, C(CN)3–] contain two interpenetrating rutile-related networks generated by octahedral six-connecting metal ions and trigonal three-connecting tcm– anions. The detailed variable temperature and variable field ma…
Electroactive and luminescent polymers: new fluorene-heterocycle-based hybrids
The synthesis, characterization, and electrochromic properties of copolymers derived from 9,9-dialkyl-2,7-dibromofluorene (18a, alkyl=C 10 H 21 ; 24, alkyl=Et) and pyrrole, thiophene, 3,4-ethylenedioxythiophene, and furan are described. Two synthetic routes to 9,9-diethyl-2,7-bis(pyrrol-2-yl)fluorene (30) afford produ…
Mechanical strength of single microcapsules determined by a novel micromanipulation technique
A micromanipulation technique has been developed to measure the bursting force of single dry microcapsules coated onto a surface, such as those normally used in carbonless copying paper. For measuring the bursting force of a given microcapsule, a single fine probe with a flat end about 10 microns in diameter was used…
Competition between benthic cyanobacteria and diatoms as influenced by different grain sizes and temperatures
An experimental laboratory set-up was used to study the influence of different grain size compositions and temperatures on the growth of benth~c cyanobacteria and diatoms, and on the competition between these 2 groups. Monospecific cultures of 3 species of cyanobacteria (Merismopedia punctata, Microcoleus chthonoplast…
Simple glass-forming liquids: their definition, fragilities, and landscape excitation profiles
The `excitation profile' of a liquid is a measure of the rate per kelvin at which the liquid is driven by entropy generation to the top of its potential energy landscape. We argue that it determines the liquid fragility, and hence controls the canonical features of viscous liquid phenomenology. We seek to prove this u…
Synthesis dependent luminescence efficiency in Eu3+ doped polycrystalline YBO3
The influence of the synthesis method on the luminescence efficiency of the orthoborate YBO 3 :Eu 3+ was studied by comparing the optical performances of samples prepared by three routes: solid state reaction (SR), wet process (WP) and sol-gel processing (SG). On the basis of X-ray powder diffraction, SEM micrographs…
Improvement of hydrothermal stability of MCM-41 mesoporous molecular sieve
Addition of cations such as tetraalkylammonium or sodium ions to the synthesis gel results in considerable improvement of the hydrothermal stability of mesoporous molecular sieve MCM-41.
Ti 2p and Ti 3p X-ray photoelectron spectra for TiO2, SrTiO3 and BaTiO3
Ti 2p and Ti 3p X-ray photoelectron spectra (XPS) were taken for TiO2, SrTiO3 and BaTiO3 single crystals fractured insitu in an electron spectrometer. The inelastic scattering energy loss parts were removed from the observed Ti core level XPS by a deconvolution method using O 1s spectra as a response function. The Ti…