Materials Literature
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In this paper, small-angle x-ray scattering measurements are used to determine the different compressibility contributions, as well as the isothermal compressibility ${\ensuremath{\chi}}_{T}^{0}$ in thermal equilibrium in silica glasses having different thermal histories. Using two different methods of analysis, in th…
The potential barrier at the apex of a single-wall carbon nanotube emitter is found to be strongly and nonlinearly dependent on the external applied field, due to a quantum mechanical mechanism instead of the correction of image potential in Fowler-Nordheim theory. The field enhancement factor depends on the applied f…
Perovskite-type gold complex ${\mathrm{Cs}}_{2}{\mathrm{Au}}_{2}{\mathrm{Br}}_{6}$ is known to show a photoinduced valence transition as well as a pressure-induced valence transition from the mixed-valence ${\mathrm{Au}}^{+}$ and ${\mathrm{Au}}^{3+}$ state to the single-valence ${\mathrm{Au}}^{2+}$ state under high pr…
Three fundamentally different failure theories for homogeneous and isotropic materials are examined in both the ductile and brittle ranges of behavior. All three theories are calibrated by just two independent failure properties. These three are the Coulomb-Mohr form, the Drucker-Prager form, and a recently derived th…
Hot air in a hurry: An industrial Fe-Mo-O catalyst, used in the production of formaldehyde has been studied under redox conditions using rapid in situ powder diffraction studies (see contour image). Surprisingly, the oxidation step is fastest as it is completed within 15 s at 472 °C.
The famous five: The elusive five-coordinate nitrito complexes [FeIII(por)(ONO)] (por=meso-tetraphenylporphyrinato dianion or meso-tetra-p-tolylporphyrinato dianion) have been obtained by interaction of low-pressure NO2 with sublimed layers of [FeII(por)]. Spectral data confirm that the NO2− ligand prefers to bind thr…
Expanded polystyrene (EPS) was recycled into a useful nanofiber for which large lengths are produced per mass of polymer. These nanofibers are mixed with micro glass fibers to modify the glass fiber filter media. The filter media are tested in the separation of oil droplets from air. The filtration experiments show th…
The electronic and magnetic properties of both LaCoO<sub>3</sub> and La<sub>0.5</sub>Ca<sub>0.5</sub>CoO<sub>3</sub> have been investigated by means of <em>ab initio</em> full-potential augmented plane wave plus local orbitals (APW+lo) calculations carried ou…
Beachtlich selektiv (88 % bei stationärer Reaktion und 94 % bei gepulster Reaktion) verläuft die direkte Synthese von Phenol aus Benzol mit molekularem Sauerstoff über einem Re/Zeolith-Katalysator, der durch chemische Dampfabscheidung erzeugt wurde. Die neuartigen Rheniumcluster mit interstitiellen Stickstoffatomen bi…
The adsorption of atoms on the tube walls of (8,0) boron nitride nanotubes (BNNTs) has been studied using the density functional theory. Adsorption of either H or F (exohedral doping) on the B site imparts hole carrier conduction characteristics on the BNNT; however, co-adsorption on both of the B and N dimer pairs re…
Abstract The γ‐initiated reversible addition–fragmentation chain transfer mediated free‐radical graft copolymerization of styrene and m ‐isopropenyl‐α,α′‐dimethylbenzyl isocyanate (TMI) from a polypropylene (PP) solid phase was performed with cumyl phenyldithioacetate (CPDA) as the chain‐transfer agent. The initial CP…
The effect of magnetic field on the photovoltaic effect (PVE) has been investigated for a manganite-based heterojunction composed of a La0.7Ce0.3MnO3 film and a 0.5 wt % Nb-doped SrTiO3 substrate. A linear decrease in the photovoltage (Voc) with magnetic fields is observed and the relative variation of Voc [defined as…
Porous silicon surfaces can be bio-functionalised by a simple three-step method. First the hydrogen-terminated porous silicon was oxidised and amino-silanised in a one-pot reaction by 3-aminopropyl(triethoxyl)silane with the aid of an organic base, diisopropylethylamine. Secondly, the primary amine reacted with either…
Highly stable field emission current densities of more than 6A∕cm2 along with scalable total field emission currents of ∼300μA per 70μm diameter carbon nanotube (CNT)-covered electron emitter dot are reported. Microwave-plasma chemical vapor deposition, along with a novel catalyst sandwich structure and postdeposition…
Gold nanoparticles stabilized by thiolates derived from normal and ω-functionalized alkane- and arenethiols (HS(CH 2 ) n CH 3, HS(CH 2 ) 10 COOH, HS(CH 2 ) 11 OH, HSC 6 H 4 NH 2, HSCH 2 CH 2 C 6 H 5, and HSCH 2 C 6 H 4 C(CH 3 ) 3 ) were synthesized. Differences in their chemical and ultrasonic stabilities were studied…
We have studied ${[{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ge}∕\mathrm{V}]}_{N}$ multilayers with a thickness of the V layers ${t}_{\mathrm{V}}$ between 1.5 and $10\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and a fixed thickness of the Heusler layer ${t}_{{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ge}}=3\phantom{\rule{0.3em}{0ex}}\…
Perovskite-structured ceramics in the (1−x)BiSc1∕2Fe1∕2O3-xPbTiO3 (BSF-PT) system were fabricated for x⩾0.45 in which a morphotropic phase boundary (MPB) occurred between rhombohedral and tetragonal phases at x≈0.50(TC=440°C). Samples close to the MPB gave piezoelectric and electromechanical coupling coefficients of ∼…
Trilaurylamine (TLA) and dodecane (i.e., hydrogenated tetrapropylene HTP) are used in laboratories of nuclear fuel reprocessing control laboratories to extract specific radionuclides such as plutonium at a certain valence. The spent solvents issued from laboratories are generally not compatible by nature and activity…
Ordered porous ZnO films were electrodeposited on an ITO glass substrate covered with PS array templates by using a zinc nitrate aqueous solution as the electrolyte. The electrochemical deposition process was analysed and the characteristics of the porous films were discussed. The results showed that Zn 2+ had an anal…
We report a phonon transport model for a bulk thermoelectric material to investigate the effect of the grain diameter and the grain-boundary thickness on its thermal conductivity. The analysis results display that the bulk thermal conductivity is significantly reduced by decreasing the grain sizes when the grain diame…