Materials Literature
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Abstract The spatiotemporal growth of spherulites in blends of isotactic polypropylene (iPP) and atactic polypropylene (aPP) isomers has been investigated theoretically with the time‐dependent Ginzburg–Landau equation, which consists of a nonconserved crystal order parameter and a conserved compositional order paramet…
The elastic properties of La/sub 3/Ga/sub 5/SiO/sub 14/ (LGS), La/sub 3/Ga/sub 5.5/Ta/sub 0.5/O/sub 14/ (LGT), Ca/sub 3/Ga/sub 2/Ge/sub 4/O/sub 14/ (CGG) and Sr/sub 3/Ga/sub 2/Ge/sub 4/O/sub 14/ (SGG) have been studied between room temperature and 1300 K using resonant ultrasound spectroscopy. In addition we investiga…
This is a summary of three different classes of ferroresonance problems commonly encountered on distribution systems.
*† ‡ § ** †† , Busek has been developing field emission cathodes using our proprietary, arc-grown, carbon multi-wall nanotubes. A cathode is slated for use in the upcoming SMART-2 mission, part of NASA’s Space Technology 7 (ST-7) New Millennium program. These field emission cathodes typically produce between 2 µA and…
Abstract A low-temperature solution-based synthetic method was developed for the synthesis of nanocubic structures of alkali tantalates. Two kinds of highly pure tantalate single crystalline nanocubes with the edge length of about 5 and 16 nm were synthesized successfully without introducing any templates or catalysts.
Based on the stabilisation of the molecular motion by the chiral residue, novel optically active biphenylic chiral dopants for nematic liquid crystals were developed. This molecular congestion was obtained by introducing mesogenic residues on the 2,2'-positions of the chiral biphenyl; this led to a novel molecular arc…
Abstract Nowadays, chemical and physical thermoplastic elastomers have found many applications in different industries. Compatibilizer and co‐continuous composition are among the important factors which control the optimum properties of a number of physical blends. Morphology, mechanical and rheological properties of…
Photochromic FRET (pcFRET), a member of the family of acceptor depletion FRET techniques (adFRET), embodies a general conceptual and experimental scheme based on a coupled system of a fluorescent donor and a photchromic acceptor. The procedure involves the reversible and cyclic spectroscopic depletion of the acceptor,…
The concept "introduction of allylic 1,3-strain (A(1,3)-strain) to photochromism" originated from the experience of total synthesis of natural products about 18 years ago, when the author was a post doc. It was first applied to synthetic organic reactions, then it was successfully employed in the diastereoselective ph…
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 $\mathrm{Mn}$…