Materials Literature
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Ln(4)FeGa(12), where Ln is Y, Tb, Dy, Ho, and Er, prepared by flux growth, crystallize with the cubic Y(4)PdGa(12) structure with the Im3m space group and with a = 8.5650(4), 8.5610(4), 8.5350(3), 8.5080(3), and 8.4760(3) A, respectively. The crystal structure consists of an iron-gallium octahedra and face-sharing rar…
Abstract A combined power system with solid oxide fuel cell (SOFC) and gas turbine (GT) is modelled and analysed thermodynamically in this paper. A novel optimisation strategy including the design of optimal parameters is proposed and applied to the hybrid system. Different sources of irreversible losses are specified…
Polypyrrole films have been prepared by potentiostatic electrochemical polymerization at low temperatures. The cyclic voltammograms and the electronic transport properties of the films are investigated as a function of the polymerization potential. As the potential increases from 520 mV to 1.2 V, the oxidation peak mo…
In the present study, the duplex stainless steel (DSS) composite plate (SAF2205/16MnR) was welded by shielded metal arc welding, and the appropriate joint design and welding procedure were carried out. After welding, the mechanical behaviors and microstructure of welded joint were analyzed by using SEM and TEM. Result…
In the present study, we investigated the magnetic interactions of some dinitrenes by employing the broken symmetry-unrestricted density functional theoretical (BS-UDFT) approach along with the use of three basis sets. The magnetic coupling parameter (J) has been calculated, and thereby the magnetic character of the m…
A combined structural/EPR/computational chemistry investigation is reported on the two paramagnetic hydrido-cluster salts [Rh(6)(PCy(3))(6)H(12)][BAr(F)(4)] and [Rh(6)(PCy(3))(6)H(14)][BAr(F)(4)], the latter being formed by reversible addition of H(2) to the former, [BAr(F)(4)](-) = [B{C(6)H(3)(CF(3))(2)}(4)](-). The…
We propose a scheme to induce transparency in one-dimensional disordered multilayers which are composed of negative permittivity and negative permeability metamaterials. First, analytical expressions for transparency condition are derived exactly, providing us a picture that complete tunneling in such kind of multiple…
Abstract The synthesis of the phthalocyanine variant dicarbahemiporphyrazine ( 1 ) follows a simple Schiff base condensation protocol, and can be readily modified to incorporate a variety of modified benzene rings into the macrocycle. In this report, we present the synthesis of dihydroxydicarbahemiporphyrazine ( 2 ) a…
Abstract Synthetic methods for a series of zinc tetra[6,7]quinoxalinoporphyrazines (6,7‐TQP) with peripheral chains connected through the S, O and N heteroatoms as well as through the C–C bond were developed. Photophysical and photochemical properties of 6,7‐TQP were compared with tetrapyrazinoporphyrazines (TPP) bear…
For a variety of laser interferometric experiments, the thermal noise of high-reflectivity multilayer dielectric coatings limits the measurement sensitivity. Recently, monolithic high-reflection waveguide mirrors with nanostructured surfaces have been proposed to reduce the thermal noise in interferometric measurement…
Three methods for improved deresination of sulphite pulps were evaluated, namely, alkaline washing, enzyme treatment, and pulp fractionation. Alkaline washing appears to come at a high cost, because caustic is expensive and affects cellulose chain length, as indicated by lower viscosity of the pulps. Thus this is not…
The discovery of ultrasound-induced in-situ formation of coordination organogels using various isobutyric acids (such as isobutyric acid or 2-methylisobutyric acid or 2-bromoisobutyric acid) and zinc oxide nanoparticles was described. FTIR and XRD results suggest that ultrasound irradiation triggers the quick dissolut…
Highly ordered hierarchical calcium carbonate is an important phase involved in calcification by a wide variety of invertebrate organisms, and its formation is of technological interest in the development of functional materials. In this article, porous CaCO(3) hierarchical microspheres with a hedgehoglike appearance…
By developing and making use of the potential theory of the polymer-mediated interaction between spherical colloids, we investigate the many-body effects on the depletion interaction among these colloids in the colloid-polymer mixture. As our main results, we obtain analytic expressions for the polymer end density in…
We introduce a novel imaging technique adopting remote focusing for resolving the axial dynamics in the director field for liquid crystals. The high axial time resolution of our approach is demonstrated by imaging directly the evolution of the director field for an initially splayed nematic layer subject to a sudden v…
Abstract Aromatic polyimides are high‐performance polymers used in applications demanding service at enhanced temperature while maintaining their structural integrity and excellent combination of chemical, physical and mechanical properties. The incorporation of various metallic additives into a polyimide matrix impro…
Two tridentate and one bidentate binding strands have been anchored on a carbon atom to provide a new unsymmetrical tripodal ligand L for Ln(III) coordination. The ligand itself adopts a single conformation in solution stabilized by intramolecular hydrogen bonds evidenced in the solid state. The reaction of L with tri…
Auf Molekülebene wurde der Bildungsmechanismus kolloidaler InP-Quantenpunkte (QDs) mithilfe von NMR-Spektroskopie untersucht. Anders als bei der Bildung von monodispersem PbSe und CdSe werden bei InP-Synthesen üblicherweise die molekularen Phosphorspezies nach der Keimbildung vollständig verbraucht, sodass die QDs aus…
A nice gathering at the interface: The de novo design and characterization of amphiphilic α/β-peptides, which form ordered two-dimensional assemblies at the air–water interface composed of oligomers in pleated conformation similar to β-sheets of α-peptides, is reported. The positioning of ionic side chains along the b…
X-ray nonlinear optics, which has been considered as a scientific frontier to be explored with x-ray free-electron lasers, is accessible with existing synchrotron x-ray sources, revealing its unique features. We demonstrate that x-ray parametric down-conversion is observed indirectly through quantum mechanical interfe…