Materials Literature
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The dissolution of nickel metal in nitric acid in the presence of the dichromate anion as the oxidizer is reported. The formation of Ni(II) and Cr(III) nitrates takes place in two steps with the intermediate formation of nitrous acid. A new method to synthesize the nickel-chromium oxide catalyst from nickel and chromi…
Component interactions in the iron-molybdenum-samarium system at 773 K were studied by powder X-ray diffraction, microstructure observation, electron probe microanalysis, and hardness and microhardness testing. The formation of a ternary intermetallic compound π with a ThMn 12 structural type was found in this system.…
The application of a multistate Markov chain is considered as a model of electromigration interconnect degradation and eventual failure. Such a model has already been used [Tan et al., J. Appl. Phys. 102, 103703 (2007)], maintaining that, in general, it leads to a failure distribution described by a gamma mixture, and…
Abstract Vermiculites have the potential to serve as effective catalysts if pillared with Al, but their high charge presents an obstacle to the pillaring process. The purpose of this study was to submit natural vermiculite to thermal treatments in the presence of water vapor in order to effect a reduction in the globa…
Solutions of metal salts in liquid polar dielectrics were considered in the approximation of a single ion placed in a system of liquid polar dielectric molecules and a system of interacting charged particles, such as cations, anions, and polarized liquid polar dielectric molecules, arranged around them. The sizes of t…
The emission spectra were measured for the sol-gel glass 5.7Na 2 O · 19B 2 O 3 · 75.35SiO 2 with chemical composition prepared under different experimental conditions, and the characteristic features of emission spectra are discussed. The results show the broad visible (500–750 nm) and IR (850–1350 nm) emission with u…
We report on the camera materials test chamber, a multivessel apparatus that analyzes the outgassing consequences of candidate materials for use in the vacuum cryostat of a new telescope camera. The system measures the outgassing products and rates of samples of materials at different temperatures and collects films o…
Photocurrents in liquid crystal cells of different structures were experimentally studied. The results of the study confirm the photorefractive mechanism of the light beam self-action in nematic liquid crystals, which consists in a decrease in the density of surface charges screening an external electric field upon li…
Bioimaging is an important tool for investigation and visualization of biological phenomena and as diagnostic tool in medicine. In this context upconverting Gd2O3:Er3+, Yb3+nanostructures (nanoparticles, nanorods) have been synthesized and investigated with regard to potential biomedical applications. Besides size and…
A new method to synthesize conducting oxide nanoparticles with low photocatalytic activity was investigated. Initially, the preparation of amorphous ZnO-SnO2solid solution nanoparticles was studied using a sol-gel technique. It was found that X-ray amorphous nanopowders with low photocatalytic activity were produced w…
In this paper, PVA/Fe3O4 composite nanofibres with diameters ranging from 100 to 300 nm via an electrospinning technique were obtained. The polyvinyl alcohol/magnetite nanofibres exhibited superparamagnetic behaviour at room temperature. In the presence of an applied magnetic field, the oriented nanofibres were obtain…
Based on classical molecular dynamics simulation, we show the possibility of the formation of multi-walled carbon nanotubes from diamond nanowires at elevated temperatures. Since the outermost shell of a diamond nanowire can be regarded as a corrugated graphene sheet bound via elongated intershell bonds, thermal annea…
Gadolinium zirconium oxide (Gd 2 Zr 2 O 7 ) films and diamond-like carbon (DLC) films were prepared by RF-magnetron sputtering and an ion gun method, respectively. To study the thermal conductivity of these films, we used the 3ω and time-domain thermoreflectance (TDTR) methods. The thermal conductivity showed a film t…
Well-defined CdS branched nanorod arrays on ITO glass were fabricated via a facile one-step hydrothermal approach in large scale employing cadmium sulfide and thiourea as starting agents. Structural and morphological evolutions of CdS branched nanorod arrays were studied by scanning electron microscopy, transmission e…
The physical properties of one-dimension al (1 D) nanostructure s of magnetic materials are presently the subject of intensive research, taking into account the considerable attention they have recently received and the few cases reported. [1-4] Much of the early work was concerned with exploratory issues, such as est…
The effect of the change in size of p-dibromobenzene nanoparticles on lattice dynamics has been studied. The nanoparticle size has been determined with an electron microscope. Experimental low-frequency Raman spectra of p-dibromobenzene particles from ∼21 µm to 50 nm in size have been taken. Frequencies of the spectru…
Wurtzitic aluminum nitride-based ceramic materials having the following high characteristics: structural ceramics with a Vickers hardness of HV = 16.8 GPa, fracture toughness K Ic = 4.7−4.9 MPa·m1/2, bending strength σ = 370–430 MPa; functional ceramics for heatsinks with a thermal conductivity of 140 W/(m·K) and for…
Recent advances in high-resolution electron backscatter diffraction (EBSD)-based microscopy are applied to the characterization of incompatibility structures near the grain boundaries (GBs) in polycrystals. The principal interest described here is recovery of geometrically-necessary dislocation (density) tensors, of t…
Natural fibre-reinforced thermoplastic composites have a significant role in non-structural applications. Natural fibres are biodegradable, renewable and of low cost, high toughness and possess good thermal properties. This work involved the study of solvent absorption of cotton/polypropylene (PP) side-by-side comming…
Nanoscale patterning in block copolymer (BCP) thin films is one of the key issues in nanoscience and nanotechnology. To make useful nanoscale patterns in applications such as magnetic media, wire-grid polarizer, and opto-electronics, the control of orientation and lateral ordering of BCP microdomains is required. The…