Materials Literature
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Abstract The anionic ring‐opening polymerization of oxetanes containing hydroxyl groups was carried out with potassium tert ‐butoxide as an initiator in the presence of 18‐crown‐6‐ether in N ‐methylpyrrolidinone at 180 °C; it yielded corresponding multifunctional hyperbranched polymers: poly(3‐ethyl‐3‐hydroxymethyloxe…
Abstract The preparation, characterization, and properties of the new thermoplastic vulcanizate (TPV)/organoclay nanocomposites are reported in this article. The nanocomposites were prepared by the melt intercalation method. The organoclay was first treated with glycidyl methacrylate, which acts as a swelling agent fo…
The coupling between the reorientation of molecular probes and the density in one low-molar mass glass former [ o -terphenyl (OTP)] and one polymer [poly(vinyl acetate) (PVAc)] is studied in the Goldstein's crossover region where the structural (alpha) and the secondary (beta) relaxations bifurcate. The coupling is fo…
A series of nonlinear optical (NLO) donor-acceptor (D-A) chromophores containing a fused terthiophene, namely dithienothiophene (DTT), as the electron relay, the same donor group, and acceptors of various strengths, has been investigated by means of infrared and Raman spectroscopies, both in the solid state as well as…
Using surface x-ray diffraction, we have determined the atomic structure of the ${010}$ interface of brushite, ${\text{CaHPO}}_{4}\ifmmode\cdot\else\textperiodcentered\fi{}2({\mathrm{H}}_{2}\mathrm{O})$, with water. Since this biomineral contains water layers as part of its crystal structure, special ordering properti…
Abstract Summary: The crystal structure of the clathrate form of syndiotactic polystyrene containing different amounts of CS 2 has been analyzed, and compared with that of the clathrate containing I 2 . These two guest molecules, which are characterized by a similar shape and volume, give rise to the only two known ex…
In this contribution we analyse the structural and optical properties of ZnO as well as ZnMgO nanopillars grown catalyst-free by metalorganic vapour-phase epitaxy. The nanostructures were grown directly onto different substrate materials with various orientations. The nanopillars deposited on a -plane sapphire show th…
The objective of this study was to determine the effect of basic fibroblast growth factor (bFGF) coating on endothelial cell seeding and proliferation on a decellularized heparin coated vascular graft and to determine the retention of seeded cells on the graft under flow conditions. Disks of heparin coated decellulari…
The lamination material used in inverter-fed ac machines shows some non ideal effects like magnetic saturation, hysteresis losses, eddy currents, and anisotropy. This presentation focuses on the effect of magnetic anisotropy which can show up in inverter fed operation and may deteriorate the performance if not conside…
Using total energy and structure optimization calculations, we investigate the relative stability and the conversion mechanism between multiwall carbon nanotubes and graphitic scrolls. We suggest that axial segments of a nanotube and a scroll may coexist within the same tubular nanostructure, separated by a dislocatio…
First-principles calculations based on gradient corrected density functional theory are performed on $\mathrm{Mn}$-doped $\mathrm{ZnO}$ thin film. Magnetism and energetics are studied for two $\mathrm{Mn}$ concentrations and varying $\mathrm{Mn}$ configurations. It is found that in the dilute limit when $\mathrm{Mn}$…
In aqueous solutions and for high concentrations triblock copolymers are known to aggregate. As a critical volume fraction of micelles is reached they crystallize. We report on grazing incident small angle neutron scattering as an experimental tool to investigate the crystallization of spherical polymer micelles in th…
Catastrophic equipment failures continue to occur today due to ferroresonance even though this phenomenon has been extensively studied over the past ninety years. This paper is concerned with describing practical examples of ferroresonance in a high voltage transmission system. Methods of mitigating ferroresonance are…
Abstract The copolymers of acrylamide and acrylamide with pendant azobenzene (AzBA–AAm) were prepared by radical polymerization. The association constants of trans-AzBA–AAm copolymers with β-CD are larger than those of cis-AzBA–AAm copolymers. The trans-AzBA–AAm guest copolymer was found to form supramolecular gels wi…
Anomalous magnetic and electronic properties of the half-metallic ferromagnets (HMF) have been discussed. The general conception of the HMF electronic structure which take into account the most important correlation effects from electron-magnon interactions, in particular, the spin-polaron effects, is presented. Speci…
Starting from exact expression for the dynamical spin susceptibility in the time-dependent density functional theory a controversial issue about exchange interaction parameters and spin-wave excitation spectra of itinerant electron ferromagnets is reconsidered. It is shown that the original expressions for exchange in…
We report on large negative magnetoresistance observed in ferromagnetic thiospinel compound CuCrZrS$_{4}$. Electrical resistivity increased with decreasing temperature according to the form proportional to $\textrm{exp}(T_{0}/T)^{1/2} $, derived from variable range hopping with strong electron-electron interaction. Re…
We have produced magnetic patterns suitable for trapping and manipulating neutral atoms on a $1 μ$m length scale. The required patterns are made in Co/Pt thin films on a silicon substrate, using the heat from a focussed laser beam to induce controlled domain reversal. In this way we draw lines and "paint" shaped areas…
This article reviews basic theoretical features of Gilbert magnetization dynamics of a single domain magnetic film in the presence of Slonczewski spin-transfer torques, with and without thermal fluctuations taken into account. Rather than showing results of detailed numerical calculations, the discussion here is restr…
Atomic Force Microscopy (AFM) has become established as a powerful and a versatile tool for investigating local mechanical properties. In addition, it has been made possible to take advantage of the AFM tip-sample interaction, to perturb, and I turn, to modify the surface of soft samples, such as polymers. The accurat…