Materials Literature
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The different crystal structures of ferromagnetic Ni2MnGa have been calculated using density functional theory (DFT) with special emphasis on the modulated structures 10M and 14M. These are important for understanding the stability of Ni2MnGa martensites and their functionality as shape-memory materials. The modulated…
Abstract This article begins with a discussion on the environmental factors that induce corrosion in magnesium alloys. It reviews the factors that determine the severity of different forms of localized corrosion, namely, galvanic corrosion, corrosion fatigue, and stress-corrosion. The article discusses corrosion prote…
The objective of this study was to assess food polymers for their ability to form edible films using extrusion technologies. Screening of a variety of food ingredients identified pectin, pea starch and gelatine/sodium alginate blends (1:4) as potential materials for formation of stable films. Extrusion temperature, po…
This paper introduces a corona-resistant nano-inorganic/organic insulation material. Chemical constitution and microscopic pattern of the inorganic filler in a corona-resistant magnetic wire insulating coating was tested and analyzed. The electricity, thermal effect of packed nano TiO/sub 2/ powders during the course…
Antimonic acid Sb2O5·4H2O with the pyrochlore structure is a well known ion-exchanger that is selective for Sr2+ in mildly acidic solution. An enhancement of the ion exchange properties of antimony-based pyrochlore materials, with respect to Cs+ and Sr2+, was previously reported by Möller and co-workers to be achievab…
Abstract Clay minerals show various chemical compositions according to numerous cationic substitutions occurring in their interlamellar space, tetrahedral and octahedral sheets. Chemical analyses are often performed at macroscopic scale and the deduced structural formulae do not necessarily reflect the actual crystal…
TiB2–SiC system composites were prepared using TiB2 and SiC powders as starting materials by an arc-melted method in Ar atmosphere. The TiB2–SiC system was binary eutectic. The eutectic composition was 40TiB2–60SiC (mol%) showing a labyrinth texture. The hardness of the eutectic composite was 27 to 30 GPa at the loads…
A combined chemical/chiroptical microscale protocol for the determination of absolute configurations of cyclic alpha-hydroxyketones is described. The hydroxyl group in cyclic alpha-hydroxyketones is converted into (3-aminopropylamino)acetate (NH2CH2CH2CH2NHCH2COOR), or more generally, according to a newly developed pr…
We study the influence of structural lattice fluctuations on the elastic electron transport in single-wall carbon nanotubes within a density-functional-based scheme. Results obtained from a frozen-phonon approach as well as from molecular dynamics simulations are compared. The linear conductance can be calculated afte…
Abstract In this paper poly(vinyl chloride)/clay nanocomposites were prepared by melt intercalation using a single screw extruder. Problems with thermal stability of these nanocomposites during compounding were largely eliminated by pre‐treatment of the organoclay with plasticizer (dioctyl phthalate), which created a…
Two Focused Ion Beam based transmission electron microscopy (TEM) thin film preparation techniques are introduced. One is dedicated to the preparation of single fibres, the other to fibre/matrix interfaces of fibre reinforced composites. Due to their thin film quality, reliability and predictable processing times both…
Abstract The newly developed VW- pVT technique for simultaneously measuring the solubility of a gas in a polymer and the concomitant change of volume of the polymer has been used to estimate the solubilities of N 2 , CO 2 , and two hydrofluorocarbons, HFC-134a and HFC-152a, in polystyrene (PS). In conjunction with the…
Electrical and magnetic properties, room temperature optical absorption bands, and 300 and 90K microcathodo luminescence (MCL) bands were studied in heavily Mn and Co doped (1–5at.%) bulk ZnO crystals. Optical absorption bands near 1.9eV (Co) and 2eV (Mn) and MCL bands near 1.84eV (Co) and 1.89eV (Mn) are found to be…
The eddy current loss of a Nd-Fe-B sintered magnet is estimated from temperature rise rate of their magnets. The obtained values of the eddy current loss coincide with the simulated data of the Integral Element Method. The method of dividing magnet is found effective in the suppression of the current loss. Also, it is…
Optically clear and stable dispersions of brightly photoluminescent Si nanoparticles were obtained by covalent attachment of alkenoic compounds to the particles. Quenching of photoluminescence by ethylamine, diethylamine, triethylamine, pyrazine, and piperazine was investigated. The photoluminescence was quenched by t…
A new charge-coupled device (CCD) spectrometer has been studied and constructed by using a two-dimensional CCD detector and an integrated grating consisting of 10 subgratings. Effective spectral images of 268 mm along the dispersion direction have been densely folded 10 times to cover the full 200-1000 nm working wave…
Our aim in this article is to derive modelsfor nonisothermal phase separation. Starting from the two fundamentallaws of thermodynamics, we consider the approach of Gurtin, based on abalance law for microforces, to derive nonisothermal Cahn-Hilliardtype equations. These equations extend previous models derived by Altan…
SrIrO3 thin films were prepared by laser ablating a monoclinic SrIrO3 target at the substrate temperature of 973 K with oxygen pressure ranging from 4 to 67 Pa. The glancing angle incidence X-ray diffraction (GIXRD) and micro-X-ray photoelectron spectroscopy (XPS) results suggested that SrIrO3 thin films were obtained…
The initial -induced atmospheric corrosion of copper deposited with NaCl has been examined with Fourier transform infrared microspectroscopy under in situ and ex situ conditions in order to reveal the spatial distribution of reaction products. The oxidation of S(IV) turns out to be fast at the area of the NaCl-contain…
The dilatometric investigation in the temperature range of 2–28 K shows that a first-order \npolyamorphous transition occurs in the orientational glasses based on C₆₀ doped with H₂, D₂ and \nXe. A polyamorphous transition was also detected in C₆₀ doped with Kr and He. It is observed that \nthe hysteresis o…