Materials Literature
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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.
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…
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…
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…
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…
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…
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 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…
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…
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…
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…
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…
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…
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…
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 (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…
${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ doped with Fe were studied by M\"ossbauer spectroscopy and neutron powder diffraction. The M\"ossbauer spectra (MS) reveal that Fe substitutes for Mn as ${\mathrm{Fe}}^{3+}$ $(S=5/2)$ and is antiferromagnetically coupled to the Mn host lattice. The magnetic be…
A series of Al, Ti, Zn and Zr compounds, i.e., their metal alkoxides, organic acid and enolate salts, halid and oxide, were evaluated as intramolecular transesterification catalysts for the thermal depolymerization reaction of poly(L-lactic acid) oligomer resulting in LL-lactide, meso-lactide and DD-lactide by gas chr…
A summary of the outstanding characteristics of the polarizable continuum model (PCM), compared with other effective Hamiltonian methods to treat chemical problems in solution, is accompanied with a more detailed exposition of the computational features recently introduced for the calculation of molecular properties i…
In the light of a recent study which identified the beneficial influence of poorly crystallised ferrihydrite Fe5HO8·4H2O on the activity of CO conversion catalysts comprising gold nanoparticles on oxidic iron, we have investigated three series of ferrihydrite-rich samples prepared by coprecipitation. The samples were…