Materials Literature
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In situ laser-induced luminescence spectroscopy is used to study the visible luminescent characteristics of ZnO during the preparation process of ZnO supported on SiO2 by the pyrolysis of different Zn precursors in N2 or O2 atmosphere. The excitation source is 325 nm light, which is above the band gap (3.37 eV) of ZnO…
A novel bis scaffold containing a pentapeptide PHGGG, derived from the prion octarepeat, forms fibrils of nanometric dimensions, thus indicating that certain segments in the unstructured region of the prion protein may facilitate an initial fibrillation event.
Luminescent lanthanide complexes of europium and terbium grafted on amino-functionalised silica particles can easily be discriminated from conventional fluorescent markers such as fluorescein thanks to a new and simple time-resolved luminescence microscopy set-up.
The temperature-dependent physical properties of four related liquid crystalline materials are reported. The materials differ chemically only in the degree of fluorination of one of the core aromatic rings and all materials exhibit both chiral smectic-C (ferroelectric) and antiferroelectric liquid crystal phases. The…
The peroxo-heteropoly compound {HPO4[W(O)(O2)2]2} was synthesized on the surface of HMS by reacting HMS-PrNH(PO3H2) with [W2O3(O2)4(H2O)2]2− solution, and then palladium ions were exchanged into the channels of HMS to form a hybrid catalyst. The novel solid catalyst showed 34.1% propylene conversion and 83.2% selectiv…
Considerable effort has been spent to incorporate carbon nanotubes into polymer matrices to exploit their extraordinary modulus and resistance to brittle failure. However, when as-synthesized nanotubes are used, the composites often fail through nanotube pullout due to poor adhesion between the nanotube and polymer ma…
A high temperature approach has been utilized for the mass production of ultra-long, straight silica nanotubes and indium sulfide filled cable-like structures by heating of an Si wafer and In2S3 powder under a stream of hydrogen/argon gases at 950 °C. Transmission electron microscopy, scanning electron microscopy and…
A series of new derivatives of the di(2-pyridyl)amine ligand has been prepared, having the general formula (py)2NR, where R is one of a wide range of groups including naphthyl, pyrenyl, benzo-18-crown-6, pyrenyl, oxazolyl and bromo-biphenyl. All ligands are luminescent, with emission maxima between 370 and 520 nm, and…
This work focuses on the study of the mechanical properties and microstructure of plates of thin wall ductile iron, cast in sand moulds of vertical and horizontal configuration. All tests were carried out on ferritised samples. Melts of carbon equivalent values ranging from 4.06 to 4.85 were used to cast plates of thi…
Abstract Summary: Copolyesters of terephthalic acid with bis(hydroxyethyl ether) of bisphenol A (BHEEB) in different molar ratios have been synthesized by reactive blending from terephthalate polyesters and by melt polycondensation from the monomers. By this way, bisphenol A groups were inserted in the polyester chain…
Table 1. The standard set of input parameters in a neural network model of creep rupture strength. The chemical compositions are all in wt%. The cooling rate can be set discreetly to air cooling, furnace cooling or quenching.
Amorphous mesoporous aluminophosphate materials synthesized from precursors of Al(NO3)3/H3PO4/NH4OH in the presence of citric acid, exhibit high specific surface areas, narrow pore size distributions and excellent thermal stabilities.
Commercially available hollow fiber membranes (HFMs) made from synthetic polymers, including cellulose acetate (CA) HFMs, used as hemopurification membranes, need to improve in hemocompatibility, by suppressing protein adsorption and clot formation. In this study, CA HFMs blended with 2-methacryloyloxyethyl phosphoryl…
The adsorption of hexane on mesoporous MCM-41 materials having different pore sizes has been studied by thermodynamic means. Additional information about their textural properties has been found using the BET model and by tracing comparison plots. Extremely low CBET parameters have been found, confirming the very low…
A constant speed, direct-injection diesel engine rated at 7.4 kW was tested on diesel fuel and four different ethanol-1-butanol-diesel microemulsions. The stable and homogeneous microemulsions were obtained by mixing 160., 170, and 180 proof ethanol-1-butanol-diesel in 1:2.5:5.5 as well as 180. proof ethanol-1-butanol…
Abstract Beginning with work by U. von Barth and L. Hedin in 1972 and continuing with recent papers in 2001 by K. Capelle and G. Vignale and by H. Eschrig and W. E. Pickett, questions have been raised about the meaning and validity of Hohenberg–Kohn theory when spin magnetism and/or magnetic fields are present. This a…
Electrochemically monoreduced [M(R,R'timdt)(2)](-) dithiolenes, showing unprecedented wavelength selective photoconducting properties in the third optical fiber window (1500-1800 nm), fine-tunable through modifications in the chemical structure, allowed for the fabrication of a test photodetector with a bit rate of ab…
Nanosized zinc gallate phosphors were prepared via the citric gel route and their luminous properties were characterized by photoluminescence in this study. From the results of X-ray diffraction studies, it was found that a spinel phase of ZnGa 2 O 4 formed after the dry gel had been heat-treated at 470°C for 1 h and…
Ac conductivity (σac) obtained from admittance of Eu2Zr2O7 and La2Ce2O7, which have pyrochlore- and fluorite-type structure, respectively, was measured as a function of frequency in the range between 5 Hz and 13 MHz and in the temperature range between 573 and 1073 K. The frequency dependence of the σac of these oxide…
ABSTRACT: Molecular dynamics simulations have been employed to study the formation of a physical (thermoreversible) gel by amphiphilic A-B-A triblock copolymers in aqueous solution. To mimic the structure of the hydrogel-forming polypeptides employed in experiments [W.A. Petka et al., Science 281, 389 (1998)], the end…