Materials Literature
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We theoretically investigated the local structure of the aperiodic states of zircon (ZrSiO 4 ) using ab initio quantum mechanical calculations. The low and high density liquid and solid glassy phases were obtained by constant volume Car-Parrinello molecular dynamics simulations, using the molar volume of metamict and…
Abstract The neutral Ln III 1:1 nitrato complexes with the chiral ligand 2,6‐bis(1‐ S ‐neopentylbenzimidazol‐2‐yl)pyridine (L 11 ) have been synthesised and their stability constants measured in acetonitrile (log K 1 = 4.0−6.4). The crystal and molecular structure of [Eu(NO 3 ) 3 (L 11 )(MeCN)] shows the typical merid…
We have measured the optical properties of wire-grid polarizers (WGPs). The implications of these results to the application of WGPs in projectors that use reflective light valves are discussed. In particular, the brightness and the contrast ratio of the projection system are investigated as functions of the angle of…
Abstract N ‐hydroxysuccinimide‐functionalized polypyrrole (PPy–NHS) coated onto polystyrene (PS) latex particles were prepared by the in situ copolymerization of pyrrole and the active ester‐functionalized pyrrole (pyrrole–NHS) in the presence of bare PS substrates. The initial comonomer concentration ratios were 25/7…
Abstract Several attempts have been made recently in order to develop “Smart” windows, which can moderate light and heat intensities. Based upon the phase transitions of polymer gels, a novel electrically adjustable window, which includes a gel layer, has been developed in our laboratory. Unlike other electrically con…
SEM and TEM observations on the cleaned material used by Hustedt for the preparation of the type of the marine diatom Cocconeis disculoides Hustedt and on living specimens of the species scraped from Posidonia oceanica (L.) Delile leaves collected in different coastal areas of the Mediterranean Sea revealed structures…
Ultrasonic atomization is a very convenient method to produce sprays of very small droplets. Resulting droplet size distributions are very narrow and the mean diameter is essentially only controlled by the excitation frequency. Generation of droplets in the micron range requires MHz waves, with voltages around 30 V, w…
Three small-celled Nupela species were found in streams and moist habitats of the United States, with a concentration of locations in the eastern part of the country. Two new species are described here: N. neglecta Ponader, Lowe & Potapova and N. Carolina Potapova & Clason. These two species and Nupela wellneri (Lange…
Abstract Chitosan grafted oligo( L ‐lactic acid) copolymers with different length of side chain were prepared through the reaction of terminal aldehyde group of oligo( L ‐lactic acid) (OLLA) and amino groups of chitosan. The mean molecular mass of the grafting OLLA chain was ca. 600 ∼ 5 000. The graft copolymers are s…
Aluminum foam metal was produced directly from the foaming method. In this foaming process, the surface tension and the viscosity of molten Al that were measured by the ring method and the rotational method, respectively, and are the two most important factors. The surface tension and the viscosity were investigated a…
Nanocrystalline nickel and zinc ferrites synthesised using a microemulsion technique were characterised by high resolution transmission electron microscopy and vibrating sample magnetometry. A narrow and uniform distribution of crystals of size range 5-8 nm, distinguished by a clear lack of saturation magnetisation at…
The use of a honeycomb zeolite concentrator and an oxidation process is one of the most popular methods demonstrated to control volatile organic compound (VOCs) emissions from waste gases in semiconductor manufacturing plants. This study attempts to characterize the performance of a concentrator in terms of the remova…
The open-closed conformational switch in the active site of Escherichia coli beta-galactosidase was studied by X-ray crystallography and enzyme kinetics. Replacement of Gly794 by alanine causes the apoenzyme to adopt the closed rather than the open conformation. Binding of the competitive inhibitor isopropyl thio-beta…
A multipole representation of the experimental electron density distribution for the high-pressure silica polymorph coesite, using Hirshfeld-type radial functions, has been generated with single-crystal X-ray diffraction data recorded to a sin θ max /λ value of 1.21 Å -1 at 100 K. Unlike an earlier modeling of the dis…
Abstract The reaction of the ligands 5 and 6 , containing two tridentate binding units, with iron( II ), cobalt( II ) and zinc( II ) leads to the self‐assembly of supramolecular architectures of [2 × 2] grid type containing four ions in octahedral coordination sites. The grid‐type structures have been assigned on the…
Abstract A crystallographic study of 13 specimens of diamonds with euhedral single-crystalline graphite inclusions in their centres is presented. All inclusions belong to the hexagonal graphite modification (space group P 6 3 / mmc ; a 0 ≈ 2.46 Å, c 0 ≈ 6.70 Å) and are up to 300 μm in diameter. Comparison of the measu…
Crack–opening displacement (COD) measurements were performed on a commercial lead zirconate titanate (PZT). The intrinsic fracture toughness (or crack–tip toughness) of this material was determined using a new evaluation procedure, which takes into account the near–tip CODs and complete crack profile CODs. The crack–t…
Abstract The mechanical properties and crystal morphological structures of dynamically photocrosslinked polypropylene (PP)/ethylene‐propylene‐diene terpolymer (EPDM) blends have been studied by mechanical tests, wide‐angle X‐ray diffraction (WAXD), scanning electron microscopy (SEM), and differential scanning calorime…
Polymer-nano-metallic-particle composites have demonstrated technological potential due to their unique optical and electrical properties. Herein, we report on composites prepared via physical vapor deposition of silver metal onto pliable poly(dimethylsiloxane) (PDMS) polymer. Rapid Ag diffusion and nano-metallic-part…
Post-steam-treatment is a facile and effective method for improving the catalytic performances of Mo/HZSM-5 catalysts in methane dehydroaromatization under nonoxidative conditions. The treatment can enhance the stability of the catalyst and also give a higher methane conversion and a higher yield of light aromatics, a…