Materials Literature
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Abstract Starch/poly(vinyl alcohol) films plasticized with glycerol were prepared by a solution‐casting method and were used as the matrix material for making jute‐fabric‐reinforced starch‐based composites. Four sets of composites were prepared with a variation in the matrix composition, all having 40 wt.‐% jute fabri…
Hybridization of DNA adsorbed to single-walled carbon nanotubes in solution has much slower kinetics than free solution DNA, and can be detected through a blue shift in the near-infrared nanotube fluorescence. Adsorption of the receptor DNA strand to the nanotube surface is consistent with models of polyelectrolyte ad…
Electrical properties of Pb(Zr0.53Ti0.47)O3∕CoFe3O4 (PZT/CFO) multilayers (MLs) were investigated in the light of Maxwell-Wagner space charge effects and the data differ from those of BiFeO3∕CoFe3O4 nanocomposites. These MLs are of special interest as weak field sensors of magnetism. These data fit the Maxwell-Wagner…
Abstract This contribution describes the influence of short‐chain branching on the temperature dependence of rheological properties of polyethylene (PE) melts in shear. The materials investigated are linear and short‐chain branched, metallocene‐catalyzed PEs of narrow molecular mass distribution. The linear viscoelast…
Synchrotron-radiation x-ray photoelectron spectroscopy (XPS) has been used to analyze size-dependent Si 2p core-level spectra of Si nanocrystals (NCs) embedded in SiO2. The Si0 and suboxide XPS peaks of Si NCs shift to higher binding energies with decreasing NC size, which is based on the resolved spectra fitted by us…
The structural, elastic, and electronic properties of TcB2 and recent synthesized superhard ReB2 were studied by the first-principles calculations. Both ReB2 and TcB2 are found to be elastically stable with the hexagonal and orthorhombic structures. For the two materials, the hexagonal structure is more stable than th…
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.