Materials Literature
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ZnO is attracting intensive attention for its versatile applications in transparent electronics, UV emitter, piezoelectric devices, chemical sensor and spin electronics. As one of the direct wide band gap semiconductors, it has advantages over GaN due to its larger exciton binding energy, better lattice match on heter…
The aim of molecular modeling is to mimic reality by considering approximations appropriate to the scale at which the simulation is carried out. At the atomic level, forcefields that represent average atomic interactions are used. However, the phase space has to be adequately explored in order to compare successfully…
Abstract In this work hybrid latexes of poly(styrene‐co‐butyl acrylate)/montmorillonite were synthesized via miniemulsion polymerization using a Brazilian organically modified montmorillonite. The natural clay was previously treated with Cetyltrimethyl ammonium chloride (CTAC) in order to increase the interaction betw…
The reaction of trimethylaluminum and dry, high-surface-area (500 m2/g) silica gel in a mixed slurry was studied using multinuclear, solid-state NMR spectroscopy. The products of the initial reaction were characterized, and their progress through subsequent washing with diethyl ether and reactions with measured amount…
The local dynamics of syndiotactic poly(methyl methacrylate) (PMMA) are investigated by explicit atom molecular dynamics (MD) simulations and quasielastic neutron scattering at temperatures well above the glass transition temperature. Using MD, we are able to isolate specific local motions well above T g . These inclu…
A new bialkali alanate K2LiAlH6 was synthesized at 320-330 degrees C and 100-700 bar. It was structurally characterized by powder X-ray diffraction. It crystallizes in space group R3m (No. 166) with unit cell parameters a = 5.62068(8) and c = 27.3986(6) A. The Li and K cation sites are mutually exclusive, and Rietveld…
Various parameters affecting the performance of bulk thermoelectric (TE) modules used for integrated circuit (IC) thermal management are studied. An effective circuit model is developed that takes into account various ideal and nonideal effects in the module. It is shown that there is an optimum module thickness and a…
Abstract Summary: Ammonium group containing cellulose derivatives are prepared from homogeneously synthesized cellulose p ‐toluenesulfonic acid esters (tosyl cellulose) by conversion with sodium azide and subsequent reduction of the azido moiety applying NaBH 4 /CoBr 2 /2,2′‐bipyridine as reagent. Regarding the tosyla…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHighly Oriented Electrospun Fibers of Self-Assembled Inclusion Complexes of Poly(ethylene oxide) and UreaYang Liu and Christian PellerinView Author Information Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Can…
This paper describes the importance of (H2O)6 clusters in controlling the properties of hexacyanoferrate (Prussian Blue) materials. A careful in situ study of compositional changes by using electrogravimetric techniques (in ac and dc modes) in hexacyanoferrates containing K+ alkali metals reveals the existence of a ch…
A simple dipping process has been used to prepare PEGylated surface gradients from the polycationic polymer poly(L-lysine), grafted with poly(ethylene glycol) (PLL-g-PEG), on metal oxide substrates, such as TiO(2) and Nb(2)O(5). PLL-g-PEG coverage gradients were prepared during an initial, controlled immersion and cha…
The paper is aimed at the elucidation of the main factors responsible for the single-chain magnet behavior of the cobalt(II) disphosphonate compound Co(H2L)(H2O) with a 1D structure. The model takes into account the spin-orbit interaction, the axial component of the octahedral crystal field acting on the ground-state…
Hydrolysis and condensation under acidic conditions of bis(triprop-1-ynylstannyl) p -phenylene 1, p -xylene 2, or butylene 3 precursors yielded bridged polystannoxanes in the form of xerogels after being dried under reduced pressure. The gels were amorphous and nonporous with very low specific surface areas. Thermal t…
The Commission on New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association (IMA) approved in 2002 a list containing the 4,000 or so minerals and mineral names on which the CNMMN has officially taken a decision since 1959 concerning their approval (A), discreditation (D
The structures of boundaries in a deformed and dynamically recovered and recrystallized quartz polycrystal (mylonite) were characterized by transmission electron microscopy, after the misorientation angles across the same grain boundaries had been analysed using electron backscatter diffraction in a scanning electron…
Metal-ligand interactions are critical components of metalloprotein assembly, folding, stability, electrochemistry, and catalytic function. Research over the past 3 decades on the interaction of metals with peptide and protein ligands has progressed from the characterization of amino acid-metal and polypeptide-metal c…
Abstract Bentonite from the ‘Bogovina’ coal mine in Serbia, was characterized. The influence of acid treatment on its composition, as well as mathematical descriptions of this influence are reported. The purpose of this work was to correlate the concentration of the acid used for the treatment with the resulting bento…
Gold platelets with a nanometer thickness and a width of up to 15 μm have been fabricated by photoreduction of Au(III) within a layered, crystalline gold complex. Particle shape selection (large spheres vs. platelets) is largely controlled by the sample temperature, which varies with the UV lamp-sample distance: at sh…
Natural and grafted chrysotile were used as matrices for the immobilization of second generation iron porphyrins. The catalysts obtained were evaluated in the oxidation reaction of cyclohexane, using iodosylbenzene as oxidant agent. The catalyst activity for different conditions was compared with results for the same…
Niobium nitride thin-film thermometry has been developed for the temperature range of 70 to 300 K. The deposition parameters have been optimized in order to get the best performances, i.e., the highest temperature coefficient of resistance (TCR), up to 300 K. The TCR is found to be largely higher than 1% as the temper…