Materials Literature
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Abstract In this work the structure of a hexachloroplatinate of a bivalent metal as iron with the formula FePtCl 6 · 6 H 2 O is reported. The crystal contains [PtCl 6 ] 2– and [Fe(H 2 O) 6 ] 2+ ions adopting a regular octahedral coordination. A 3D hydrogen bond framework takes part in the cohesion of the structure pak…
che der Partikel mit Detergens funktionalisiert. Vor bzw. nach Zugabe des Matrixpolymers in das organische Lsungsmittel werden Agglomerate durch mechanischen Energieeintrag dispergiert. Der Einfluss auf den dispersen Zustand und die Stabilitt des Organosols wird beschrieben. Die adsorbierten Detergensmolekle sorgen fr…
The luminescence spectra of naturally occurring apatite Ca5[F∣(PO4)3] and fluorite CaF2 crystals, containing traces of rare-earth elements have been compared with phosphate glasses doped with Pr3+, Sm3+ and Er3+ ions. The selected excitation bands for luminescence of samarium and praseodymium ions were indicated. Sepa…
Utilizing metal-vanadium oxide (VO2)-semiconductor capacitor device structures, we have investigated the temperature- and frequency-dependent dielectric and ac conductance responses of vanadium oxide thin films that undergo metal-insulator transition (MIT). In both metallic and insulating regimes, VO2-based devices sh…
By the quantum-chemical method (U)B3LYP/6-31G(d 5,p) are determined point symmetry group (D 4h ) and equilibrium structure of phthalocyanine (PcH2), phthalocyaninates PcBe, PcMg, PcCo, PcNi, PcCu, PcZn, perfluorophthalocyaninates FPcNi, FPcCu, FPcZn, cations Pc+Mt, FPc+Mt and anion PcCo−. In the approximation (U)B3LYP…
The measurement of partial discharge is used in the performance assessment of insulation systems of high voltage components. This paper describes the development of a test object consisting of a single spherical cavity within a dielectric material. The test object is used to experimentally study the effect of variable…
Soft silicone gels are frequently used to encapsulate IGBT power electronics modules. The role of the gel is to protect components and connections against moisture, pollution, and also to avoid partial discharges. The objective of this paper is to study PDs occurring on ceramic AlN metallised substrates, embedded in s…
In recent years, the availability and low cost of nanometric-sized filler particles have generated great interest in polymer nanocomposites for a host of applications, including electrical insulation with enhanced breakdown and voltage endurance properties. This work combines the results of several experiments to add…
When metallized capacitors are applied to pulsed power applications with frequency less than 1 Hz, heat induced by current can be ignored. However, it is necessary to consider the accumulation effect of heat on temperature rise of capacitors which are applied to repetitive pulsed systems. The paper mainly study the in…
We present evidence for the existence of a new form of charge transport in insulating polymers which takes the form of charge pulses that move exceptionally quickly across the insulation in comparison to the charge carrier mobility typical of such materials. This phenomenon could be associated with electromechanical c…
Amongst fission products formed in atomic reactors, 99 Tc is the most hazardous for the environment because of its long half-life (213000 yr), high content in spent nuclear fuel (SNF) (0.8–1.0 kg per ton of SNF), low sorption ability, and high mobility under aerobic conditions. The bulk of 99 Tc (∼200 t) is incorporat…
Temperature dependent synchrotron x-ray powder diffraction, differential scanning calorimetry, and magnetic measurements were performed on Ni2+xMn1−xGa (x=0.20 and 0.35) magnetic shape memory alloys. For x=0.20, though the monoclinic phase is thermodynamically stable, a trace of residual stress can stabilize a tetrago…
A 3 2+ Te6+M 3 2+ X 2 5+ O14 (A = Pb, Ba, Sr; M = Zn, Mg, Co, Mn, Cu, Cd; X = P, As, V) compounds and Pb3WZn3P2O14, all with Ca3Ga2Ge4O14 structure (space group P321), were prepared by solid-phase synthesis in air at 600–1000°C. Most compounds melt incongruently or experience solid-phase decomposition.
Macromolecule networks were introduced into the networks of normal sopping swelling materials by redesigning the materials molecule structure, and thus forming materials with the characteristics of retarding swelling, high strength and the structure of interpenetrating networks. The microscopic structure of the materi…
A dielectric barrier discharge reactor with inner electrode modified with metal oxides of Ti, Mn and Co has been designed and tested for the oxidation of diluted volatile organic compounds (VOCs) of different nature like toluene, isopropanol and trichloroethylene. It has been observed that at a fixed concentration of…
A versatile way of preparing macroporous monolithic materials from linear aliphatic polyamides is presented. Simply, polyamide pellets were treated in benzyl alcohol (BA) at elevated temperature, causing dissolution by interchain hydrogen bond disruption. Subsequent cooling below the upper critical solution temperatur…
The results of a UV-vis and fluorescent spectral investigation of a tetra-15-crown-5-substituted aluminum phthalocyanine [ (R 4 Pc)Al(OH) ] (1), where (R 4 Pc) 2- = 2,3,9,10,16,17,24,25-tetrakis(15-crown-5)phthalocyaninate-dianion, in different solvents (CHCl 3 , DMSO, MeOH) are reported. It was shown that compound ex…
The structures of two lead germante glasses – yGeO 2 ·(100-y)PbO and xNd 2 O 3 (100-x)[GeO 2 ·PbO] – are investigated by the Fourier transform infrared (FTIR) spectroscopy. The structural role of germanium, lead and neodymium ions is discussed. The presence of GeO 4 , GeO 6 and PbO 4 structural units was evidenced in…
In this work, ZrC-based composites reinforced with SiC particles were processed using the hot-pressing route. The influence of SiC content on the microstructure and mechanical properties of the hot-pressed composites was investigated. In all composites with different SiC contents, the highest relative density was obta…
Lipid matrix nanoparticles, such as solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC), have been sought as a useful alternative for formulating poorly soluble drugs intended for several administration routes, e.g. oral, parenteral and topical. These systems are surfaced by a film of surfactant in…