Materials Literature
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The system zirconia−praseodymia (Pr content 0−15 mol %) has been investigated to evaluate the praseodymium solubility and its role in the zirconia phase stability. The powders have been synthesized by coprecipitation and subsequent calcination at different temperatures (400−1000 °C) for 2 h. The crystal structure of t…
Phase change materials (PCMs) of cellulose diacetate (CDA) modified with polyethylene glycol (PEG) prepared by chemical bonding and physical blending methods exhibit different characteristics: Chemically bonded materials exhibit typical solid-solid phase change characteristics, but the blended materials exhibit solid-…
The crystalline lamellar thickness of semicrystalline poly(ethylene terephthalate) (PET) was evaluated using small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) techniques. Both SAXS onedimensional (1D) correlation function and interface distribution function analyses were utilized to determ…
*Reprinted from Handbook of Polyethylene: Structures, Properties, and Applications; Marcel Dekker, Inc.: New York; 2000, 375–414.
The effects of heat-treatment on the structure of the strontium ion-exchanged titanosilicate ETS-4 have been studied by Rietveld analysis of powder neutron diffraction data and by FT-Raman spectroscopy. Hydrous Sr-ETS-4 (space group Cmmm), upon heat-treatment under inert atmosphere at temperatures between 423 and 573…
Isotactic poly(3-hydroxybutyrate) (P3HB) is an aliphatic polyester obtained by bacterial fermentation. This truly biodegradable polymer has been widely investigated, mainly with the aim to replace conventional plastics, which cause environmental pollution. To improve its properties, extensive studies have been conduct…
The synthesis of new chiral polyisocyanates is described. For this purpose a new chiral azobenzene containing monomer with the chiral center in α-position to the isocyanate group was synthesized. The anionic copolymerization was carried out in THF as solvent with potassium cyanide that was complexed by 18-crown-6 as i…
The purpose of this article is twofold. First, there is an account of the hot-compaction behavior of a new, highly oriented, high-modulus polyethylene (PE) tape with the trade name of Tensylon® (manufactured by Synthetic Industries, USA). This tape, produced by a melt spinning route, has mechanical properties comparab…
Morphology and molecular structure of three nascent ultra high molecular weight polyethylene (UHMWPE) powders synthesized on unsupported and supported Ziegler-Natta heterogeneous catalysts were studied with the help of electron microscopy and infrared (IR) spectroscopy. A synthesis was carried out in a slurry process…
Different charged forms of substitutional oxygen in diamond are examined using ab initio plane-wave pseudopotential calculations. The results show that two defect levels are associated with substitutional oxygen and that the charged form of the defect depends sensitively on the Fermi level. One of the defect states li…
A model is presented for the magnon-phonon interaction in three-dimensional cubic ferromagnetic systems. The Heisenberg Hamiltonian for localized spins is used. The calculated magnon and phonon dampings are compared with the experiments and good agreement is found. It is estimated that there is a significant broadenin…
We already reported spontaneous vesicle formation in aqueous solutions of bis(11-ferrocenyl(undecyl))dimethylammonium bromide (11-BFDMA), a newly synthesized ferrocene-modified double-chain-type cationic surfactant (Kakizawa, Y.; Sakai, H.; Nishiyama, K.; Abe, M. Langmuir 1996, 12, 921.). We have examined in this stud…
Side chains of poly(acrylic acid) (PAA) were conjugated with cysteamines for self-assembly on a gold-coated membrane. The self-assembly of the cysteamine-modified PAA on the membrane was monitored by surface plasmon resonance spectroscopy. It was found that the amount of assembled polyelectrolytes significantly depend…
4,7-Bis(dialkylamino)benzo[c][1,2,5]chalcogenadiazoles are a novel class of organic dyes that undergo reversible two-stage one-electron oxidation as well as one-electron reduction. They exhibit absorption maxima in the long-wavelength region, which are assigned as intramolecular charge transfer bands from the phenylen…
Undoped and Bi/Sb doped highly transparent ZnO films were grown adopting metal organic chemical vapor deposition with suitable combinations of Zn(C 5 F 6 HO 2 ) 2 ·2H 2 O·(CH 3 OCH 2 CH 2 ) 2 O, Bi(C 6 H 5 ) 3, and Sb(C 6 H 5 ) 3 precursors. Hexagonal ZnO phases were always found. Doping levels ranged from 1.4 to 7.4…
Long-term anodization of aluminum provides a hexagonally ordered array of nanopores with very uniform pore diameters (between 30 and 50 nm, depending on pH, acid, and potential) and pore spacings of 80 to 100 nm within a matrix of amorphous aluminum oxide. However, one often desires smaller diameters. Because the bott…
The crystal structure and physical properties of Bi 3 Pb 2 Nb 2 O 11 Cl, a member of the Sillen−Aurivillius phase intergrowth family, have been probed using powder neutron diffraction, high-resolution transmission electron microscopy (HRTEM), second harmonic generation (SHG) tests, and alternating current impedance me…
With the help of an improved internal friction method, it was found that a peak could appear, as the temperature increased, above the liquidus in each of the internal friction curves of Pb-Bi alloys. The features of this kind of peak are similar to those found during the solid-liquid transition in the same experiments…
Abstract Waste tyre rubber has proven to be a suitable precursor for the production of high quality activated carbons. The performance of these carbons in commercial applications such as water treatment or gas purification is highly dependent on their surface characteristics. This paper presents an in‐depth investigat…
Raman spectroscopic measurements on negative-thermal-expansion (NTE) material zirconium tungstate Zr(WO 4 ) 2 at 20 K over the complete range of phonon frequencies yield 39 out of the predicted 54 optical phonons. The modes are assigned as lattice modes, and translational, librational and internal modes of the WO 4 io…