Materials Literature
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We study both experimentally and theoretically the driven motion of domain walls in extended amorphous magnetic films patterned with a periodic array of asymmetric holes. We find two crossed ratchet effects of opposite sign that change the preferred sense for domain wall propagation, depending on whether a flat or a k…
Dendrimers are hyperbranched nanosized and precisely defined molecules, attracting increasing attention each year due to their numerous properties in catalysis, materials science, and biology. This tutorial review concerns the use of dendrimers as catalysts and focuses more precisely on their properties as enantiosele…
Exchange interactions among defects in semiconductors are commonly treated within effective-mass theory using a scaled hydrogenic wave-function. However such a wave-function is only applicable to shallow impurities; here we present a simple but robust generalization to treat deep donors, in which we treat the long-ran…
Effect of a magnetic field on martensitic transformation in the NiCoMnGa alloys was investigated. A field-induced reversible martensitic transformation from the martensitic phase of low magnetization to the parent phase of high magnetization has been realized. The substitution of Co for Ni atoms has turned the magneti…
A method is suggested to separately determine the surface density of positively and negatively charged impurities that limit the mobility in a graphene monolayer. The method is based on the exact result for the transport cross section, according to which the massless carriers are scattered more strongly when they are…
The experimental Mn K-edge x-ray absorption spectra of La$_{1-x}$Sr$_x$MnO$_{3}$, $x$ = 0 - 0.7 are compared with the band structure calculations using spin polarized density functional theory. It is explicitly shown that there is a correspondence between the inflection point on the absorption edge and the centre of g…
The effects of process variables on the microcellular structure and crystallization of foamed polypropylene (PP) with supercritical CO2 as the foaming agent were investigated in this article. The cell size increased and the cell density reduced with increased foaming temperature. Differently, both the cell diameter an…
As part of an ongoing research on biodegradable composites, which can be aptly termed as green composites, the present article reports on the incorporation of wood industry waste material, wood dust, as organic filler in film matrix based on Poly(Vinyl Alcohol) as continuous phase. In this study as filler, dust of Piy…
Lead sulfide is an important semiconductor that has found technological applications for over a century. Raman spectroscopy, a standard tool for the investigation and characterization of semiconductors, has limited application to this material because of the forbidden nature of its first order scattering and its opaci…
The recent finding of a 1-bond->2-phonon `percolation'-type behaviour in several random zincblende alloys, supporting an unsuspected 1-bond->2-mode behaviour in the bond length distribution, renews interest for a discussion of CuPt-type spontaneous ordering (CPSO) as a purely intrinsic effect. We investigate this key…
This paper discusses the spectral properties of glasses doped with ytterbium and erbium ions with the maximum concentrations of ytterbium. The absorption spectra are measured and the Judd-Ofelt parameters are determined for ytterbium metaphosphate doped with erbium.
The synthesis of a layer of catalytic filamentous carbon (CFC) on a Co catalyst supported by homogeneous precipitation onto the surface of aluminosilicate supports (ceramic foam and vermiculite) was studied. The effects of CFC layer synthesis conditions (the catalyst concentration on a support, the pyrolysis temperatu…
Conditions for the synthesis of linear polysilylcarbodiimides based on bis(trimethylsilyl)carbodiimide have been investigated. The method of preparing new silylcarbodiimidesilazane polymers via the polycondensation of bis(trimethylsilyl)carbodiimide with methylphenyldichlorosilane and cyclosilazanes has been developed…
It is shown that lead ferronyobate Pb 2 FeNbO 6 (PFN) ceramics exhibit ferroelectric relaxor properties at low frequencies. The possible mechanisms of conductivity in PFN ceramics are analyzed.
The paper reports on the results of ab initio calculations of the static and dynamic properties of the LaMnO 3 crystal with a perovskite structure in the cubic, rhombohedral, and orthorhombic phases. The calculations are performed within the ionic crystal model, which takes into account the deformability and polarizab…
Polyamides were one of the earliest powder coatings invented for metal protection and soon established recognition for their physical toughness, visual attractiveness and compatibility with potable water and foodstuffs. The available polyamides today can be derivatives from both crude oil and castor oil refining proce…
The dependence of the strain energy of anion-cation bonds on the sum Ψ2 of squares of the angles of ordered rotations of octahedra around the coordinate axes of the reduced cell has been determined for ABX 3 compounds with perovskite structure in the two-particle approximation. A relation determining the change in the…
A thermodynamic approach to predicting the compatibility of the binder with the filler by calculating the nonpolar and acid-base parameters of the filler and polymeric matrix was considered. The calculated adhesion stabilities of the composite systems are consistent with the structural and functional features of their…
Gel permeation chromatography with differential refractometry is used to obtain molecular weight distributions (MWD) of poly-(epsilon-caprolactams). Elution is carried out using an m-cresolchlorobenzene mixture (50:50, v/v) at 50 degrees C. MW values are obtained by a Hamielec-based calibration method, using broad-MWD…
The author offers counterpoint commentary in response to Shaffer's suggestion that the Lewis acid–base approach be applied to reactions such as ammonia–water and HCl–water.