Materials Literature
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Advances in first-principles computational approaches have, over the past fifteen years, made possible the investigation of physical properties of ferroelectric systems. In particular, such approaches have led to a microscopic understanding of the occurrence of ferroelectricity in perovskite oxides at ambient pressure…
Abstract The strain rate sensitivity of nanocrystalline nickel was studied at different temperatures in tensile tests and with a nanoindenter in order to examine the effect of grain size on the different deformation mechanisms of nanocrystalline materials. The experiments yielded, depending on temperature and strain r…
OBJECTIVES: Brain malignant neoplasms are still characterized by poor prognosis due to their peculiar hallmarks that severely limit aggressive multimodal therapeutic approaches. The optimization of the intratumoral drug delivery, directed to achieve effective concentrations and to reduce systemic undesired toxicity, i…
An analysis system was developed to evaluate the sliding behavior of a liquid droplet on a hydrophobic surface. This system enables continuous and simultaneous measurement of both the sliding acceleration and shape deformation during the sliding of a liquid droplet. Moreover, the velocity vector of the internal fluidi…
Nuclear quadrupole resonance (NQR) is a radio-frequency technique that can be used to detect the presence of quadrupolar nuclei, such as the$^{14}{\rm N}$nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin…
Positive ac dielectrophoresis (DEP) is used to rapidly align ensembles of CdSe semiconductor nanowires (NWs) near patterned microelectrodes. Due to their large geometric aspect ratio, the induced dipole of the wires is proportional to their conductivity, which can be drastically enhanced under super-band-gap illuminat…
Inclusions embedded in conventional positive refractive index materials are used to fabricate artificial materials, with negative permittivity, permeability and negative refractive index (NRI). We consider electromagnetic wave propagation in NRI materials with chiral properties that are not negligible. To this end we…
The optical properties of ethylene vinyl acetate (EVA) film have been studied. The effects of gamma irradiations on the optical spectrum of EVA films have been investigated using spectrophotometric measurements of reflectance and transmittance in the wavelength range 200–1100 nm. The absorption spectra were recorded i…
The previous thermodynamic consideration of the mechanochemical effect of dissolution and the calculation of the chemical affinity of dissolution under the conditions of strain are supplemented by the analysis of the process kinetics. A typical, for modern experiment, case of dissolution (evaporation) of a bent plate…
This paper presents proof-of-concept experiments on metallic bistable structures, and is followed by a companion paper about experiments on composite bistable structures.A bistable structure is characterized by a stress/strain curve with stable branches separated by unstable branches.The authors were interested in a p…
Abstract Thermally induced lamellar structure changes due to phase transition and degradation in organoclays based on a synthetic ‘Somasif’ mineral and two organic surfactants, di-methyl dihydro-ditallow ammonia chloride (DMDTA) and tri-butyl-hexadecyl phosphonium bromide (HTBP) were investigated by differential scann…
To study the self-formation mechanism of Ti-rich layers in Cu(Ti) alloy films, the microstructures and electrical resistivities of the Cu(Ti) alloy films were investigated by changing the annealing atmosphere and substrate materials. Oxygen contained in Ar facilitated Ti segregation at the surface, reduced the Ti cont…
A novel plasma CVD process induced by diffuse coplanar surface discharges (DCSD) for TiO 2 film fabrication at atmospheric pressure and room temperature is reported. Using this simple and low‐cost process, uniform‐sized nanosphere, crystalline TiO 2 thin films (see figure) have been successfully fabricated.
Thin films of ZnO grown by sol-gel spin method using two different precursors viz. zinc nitrate and zinc acetate have been characterized for their crystalline nature and associated nanostructures. In some cases, the films consist of nanostructures in the form of nanocrystals and nanoneedles of dimensions in the range…
Perovskites are a large class of minerals, both naturally occurring and synthetically produced, with important technological applications. In this article, platinum group metal (pgm) perovskites are introduced as a relatively new catalyst material. Due to their high activity, versatile and stable structure and low pgm…
The parameters such as the angle in “V” area in Sirofil spinning system, the tension and torque of the filament and roving with different feeding spacing are theoretically discussed. The optimal strand-spacing of different spinning materials is, thus, recommended. The configuration, strength and elongation, hairiness…
Abstract The selectivities of clay minerals for larger organic cations over smaller ones have been attributed to favorable clay-organic interactions in clay interlayers and to hydrophobic effects resulting from (partial) dehydration of organic cations in the clay interlayers, but the magnitudes of these energy compone…
The 28-kV, novel, environmental-friendly, thermoplastic elastomeric insulators were tested under slightly modified IEC 1109 5000-h (Annex C) conditions for their long-term performance. The modifications were made to more closely represent the actual service environment than the conditions used in the IEC. Various stre…
Plasma-deposited polymer films were prepared from organic molecules and investigated using near edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) for aging effects after exposure to air. Results from the investigation of homopolymers are summarized. Primarily the effect of the de…
Basing on the literature data the process of foaming extrusion was discussed in details including the types of extrusion heads used (Fig. 1-5) and porophors used in the process, with their decomposition characteristics. Using modernized technological line for coating extrusion, containing a vacuum-pressure calibrator…