Materials Literature
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Octasubstituted zinc tetrapyrazinoporphyrazines with four N,N-dimethylaminophenyls and four phenyl or pyridin-3-yl substituents were synthesized and fully characterized. Their fluorescence quantum yields in DMF or pyridine were very low, almost undetectable, as a consequence of ultrafast intramolecular charge transfer…
Thermoelectric materials can be used for cooling/heating applications, or converting waste heat into electricity. Novel thermoelectric materials have been discovered in recent years. Characterization of an electrical conductivity and thermopower of a sample from room temperature to > or = 900 K is often necessary for…
Any attempt to summarise the concept of ‘grain boundaries’ in a short article is destined to fail, but by focusing on one aspect of the literature, the coincident site lattice model, it may be possible to provide an historical perspective that includes some insight. This contribution attempts to outline the symbiotic…
A moth-eye structure, which suppresses the reflection on a surface, was fabricated on the entire surface of a large silicon wafer by the formation of a self-assembled particle monolayer as a dry-etch mask formed by our embedded particle monolayer (EPM) method. We optimized the shape of moth-eye structures by optical c…
Dielectric studies of nanoparticles of the Rochelle salt embedded in pores of porous alumina have been performed in the temperature range from 80 K to the decomposition temperature of the bulk Rochelle salt. It has been revealed that the permittivity exhibits an anomaly corresponding to the lower structural transition…
Epoxy resin is widely used in high voltage apparatus as insulation. Fillers are often added to epoxy resin to enhance its mechanical, thermal and chemical properties. The addition of fillers can deteriorate electrical performance. With the new development in nanotechnology, it has been widely anticipated that the comb…
The aim of this study is to improve both thermal conductivity and electrical insulation properties of epoxy based composites using nanocomposite techniques. This paper deals with the effects of adding nano-scale alumina and silica fillers on thermal conductivity and dielectric strength of epoxy/alumina micro-composite…
A room temperature multiferroic compound Ba4Bi2Fe2Nb8O30 was synthesized using a solid state reaction technique. Rietveld analysis of x-ray diffraction data shows that Ba4Bi2Fe2Nb8O30 has a tetragonal (space group P4bm) tungsten bronze structure. In this structure, the Fe3+ and Nb5+ statistically occupy the octahedral…
We drew upon recent advances in tandem mass spectrometry‐based proteomic analyses in order to examine the proteins that remain after a diatom bloom enters the stationary phase, precipitates out of the photic zone, and is subjected to microbial degradation over a 23‐d period within a controlled laboratory environment.…
We studied the following to clarify the design rule of the miniature cantilever-type ultrasonic motor using lead-free array-type multilayer piezoelectric ceramics, which is (Sr,Ca) 2 NaNb 5 O 15 . The relationship between the motor properties and stator vibrator dimensions was investigated by the finite element method…
In recent past research on nanometal-glass hybrid composites has been the centre of attention across the globe particularly in the area of nanoscience and for the future nanotechnology. In this review, with a short historical background, its preparation by various multi-step techniques, properties and applications are…
A correlation between the temperature of the synthesis of carbon nanotubes ( CNT ) by method of catalytic pyrolysis from ethanol on a nickel catalyst and their ability for the modification of oxidation under various conditions and also their adsorption capacity to a number of metal ions is demonstrated. The study of i…
Abstract Oxide formation during production annealing and the subsequent pickling response in mixed acid have been studied. The aims were to characterise the oxides formed and to understand how the pickling mechanism and kinetics are affected by the nature of the oxide. Totally, eight different versions of the austenit…
We have explored the effect of the O/Ru ratio on the morphology and the Seebeck coefficient of RuO2 nanorods (space group P42/mnm) synthesized by reactive sputtering. At an O/Ru ratio of 1.69, a faceted surface is observed, while nanorod formation occurs at O/Ru ratios of 2.03 and 2.24. Using classical molecular dynam…
We report the activation of silicon implanted with phosphorus and boron atoms by infrared semiconductor laser annealing using carbon films as an optical absorption layer. 2-µm surface region was heated above 1000 °C longer than 22 µs by scanning the laser beam for a dwell time of 40 µs. We carried out implantations of…
The crystal structure of the ground state of ten free-standing ferroelectric superlattices based on crystals with the perovskite structure (BaTiO 3 /SrTiO 3 , PbTiO 3 /SrTiO 3 , PbTiO 3 /PbZrO 3 , SrZrO 3 /SrTiO 3 , PbZrO 3 /BaZrO 3 , BaTiO 3 /BaZrO 3 , PbTiO 3 /BaTiO 3 , BaTiO 3 /CaTiO 3 , KNbO 3 /KTaO 3 , and KNbO 3…
Absorption and fluorescence spectra obtained at temperatures as low as 4 K were investigated between 200 and 1550 nm on samples containing approximately 1.2 at. wt. % Er in Y3Al5O12 (YAG). Within this wavelength range 125 experimental energy (Stark) levels were analyzed, representing data that span 29 2S+1 L J multipl…
We employ large-scale quantum Monte Carlo simulations to study the magnetic ordering transition among dilute magnetic moments randomly localized on the graphene honeycomb lattice, induced by long-ranged Ruderman-Kittel-Kasuya-Yoshida interactions at low charge-carrier concentration. In this regime the effective exchan…
Abstract We present Car–Parrinello molecular dynamics (CPMD) simulations of yttrium alumino‐silicate (YAS) glass. Alumino‐silicate glass microspheres are used as vectors of yttrium radioisotopes in cancer radiotherapy; understanding in detail how yttrium is bound within the glass network is important to control the un…
A bundle of single wall carbon nanotubes (SWCNTs) with circular cross-section is treated as a homogeneous material with a.c. effective conductivity σ(ω), which is evaluated by using the Drude's complex expression. The effective d.c. conductivity of the homogeneous bundle is obtained from the total d.c. resistance. The…