Materials Literature
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The Ce3+∕Eu2+ coactivated Sr3B2O6 phosphors exhibit varied hues from blue through white and eventually to yellow-orange by resonance-type energy transfer from Ce3+ to Eu2+ and tuning the relative proportion of Ce3+∕Eu2+ properly. The authors have demonstrated that electric dipole-dipole interaction dominates the energ…
A low-temperature dealloying technique was developed to tailor the characteristic length scale of nanoporous gold for advanced functional applications. By systematically investigating the kinetics of nanopore formation during free corrosion, the authors experimentally demonstrated that the dealloying process is contro…
The combination of some three-atom bridges with paramagnetic 3d transition metal ions results in the systematic isolation of molecular magnetic materials, ranging from single-molecule and single-chain magnets to layered weak ferromagnets and three-dimensional porous magnets. The design strategy and role of secondary c…
Summary Oseberg Sør field, operated by Hydro Oil & Energy, is situated 130 km west of the Norwegian coast on the eastern flank of the Viking Graben structure. It comprises a sequence of fault-bounded structural units of varying geological complexity. Within these units, the reservoir intervals are of moderate to p…
The ultimate aspiration of any detection method is to achieve such a level of sensitivity that individual quanta of a measured value can be resolved. In the case of chemical sensors, the quantum is one atom or molecule. Such resolution has so far been beyond the reach of any detection technique, including solid-state…
The possible combination of specific physicochemical properties operating at unique sites of action within cells and tissues has led to considerable uncertainty surrounding nanomaterial toxic potential. We have investigated the importance of proteins adsorbed onto the surface of two distinct classes of nanomaterials (…
Abstract A novel membrane reactor process using porous α-Al2O3 tube loaded with silver–strontium catalyst realized direct O2 epoxidation of propylene with notable selectivity of propylene oxide. Segregated feed of propylene and O2 combined with facile permeation of reactants and products across the membrane was essent…
In the search for optimal electro-optical modulating materials we report in this work molecular dynamics simulations of polycarbonate doped with Lemke chromophores which is a promising candidate system for materials with such functionality. The simulations cover the electric field poling effects on the chromophore ord…
Purpose This paper sets out to give an introduction to sonochemistry and the effects brought about by the application of ultrasound that might be useful in surface modification; and to show the feasibility of sonochemical surface modification in water on a range of materials employed in electronic manufacturing. Desig…
We report a combined X-ray photoelectron spectroscopy (XPS) and cyclic voltammetric study of Ru(0001) electrodes covered by platinum. The Ru(0001) surfaces were prepared in ultrahigh vacuum, transferred to an electrochemical cell, and covered with platinum using either spontaneous deposition or electrolysis tactics. T…
X‐ray diffraction analyses and scanning electron microscopy revealed that Na 0.5 Bi 0.5 TiO 3 (NBT) and NaTaO 3 (NTa) form solid solutions across the whole concentration range. With increasing NTa content the symmetry of the solid solutions gradually changed from rhombohedral, on the NBT‐rich side, to orthorhombic, on…
External electric field effects on absorption, fluorescence, and phosphorescence spectra of a series of unsubstituted diphenylpolyynes have been examined in a PMMA film. The analysis of the electroabsorption spectra indicates that the shorter diphenylpolyynes exhibit only the change in molecular polarizability, wherea…
A template-free facile fabrication method for one dimensional Ag nanoparticle arrays was developed. The recrystallization of silver phenylacetylide brings diameter-controlled nanowires. UV irradiation or heating converts the nanowires into one dimensional Ag nanoparticle arrays via decomposition of phenylacetylide.
Topotactic modification, by both oxidation and reduction, of the composition, structures, and magnetic properties of the layered oxychalcogenides Sr4Mn3O7.5Cu2Ch2 (Ch=S, Se) is described. These Mn3+ compounds are composed of alternating perovskite-type strontium manganese oxide slabs separated by anti-fluorite-type co…
We present for the first time an in-depth study of the RF response of a single-walled carbon nanotube (SWCNT) rope. Our novel electrode design, based on a tapered coplanar approach, allows for single tube measurements well into the GHz regime, minimizing substrate-related parasitics. From the analysis of the S-paramet…
An octaethylporphyrin derivative, 1, possessing an exo-five-membered ring fused at the 13- and 15-positions was oxidized by osmium tetroxide to give two isomeric chlorins, 3 and 5, possessing beta,beta'-dihydroxy groups at the A- and C-rings, respectively. Single dehydration of 2,3-dihydroxychlorin 3 gave a mixture of…
The effectiveness of the 2,4-dinitrobenzenesulfenyl and 4-nitrobenzenesulfenyl groups as masking and directing groups at the 2-position of pyrrole has been investigated and compared to that of 2-phenylthiopyrrole. The presence of the nitro group(s) enhances stability of the corresponding pyrrole toward acid and does n…
Unique PbS nanowires with x-shaped cross sections, with diameters in the range of 300-800 nm with an average of 598 nm (sigma = +/-21.7% ), and lengths of up to several tens of micrometers, have been made by a solventless method. Such nanowires show high adsorptivities of the PbS nanooctahedra, which can be washed off…
The formation of particle monolayers by convective assembly was studied in situ with three different kinds of particle-surface interactions: adsorption onto native surfaces, with additional electrostatic interactions, and with supramolecular host-guest interactions. In the first case carboxylate-functionalized polysty…
Hydrothermal [2+3] cycloaddition reactions of N -4‘-caynobenzylcinchonidine bromide (CBCBr) with NaN 3 in the presence of ZnBr 2 offer a novel Zn dimer (CBC−N 4 ) 2 ZnBr 2 (N 3 ) 2 (X 2 O), X = H for 1 and D for 2 ) in which the reactant Br - and N 3 - take part in the coordination to Zn. The measurements of ferroelec…