Materials Literature
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Highly textured Ca-doped (ZnO) m In 2 O 3 ( m is an integer) ceramics were fabricated by the reactive templated grain growth (RTGG) method and their thermoelectric properties were examined. Platelike ZnSO 4 ·3Zn(OH) 2 particles were used as reactive templates and mixed with In 2 O 3 and CaCO 3 powders into a stack of…
Mesoporous semimetal bismuth film and magnetic metal nickel and cobalt thin films have been electrodeposited from hexagonal or lamellar structured lyotropic liquid crystalline phases with polyoxyethylene surfactant. The liquid crystalline templates are characterized by low-angle X-ray diffraction (XRD) and polarized-l…
Strain-induced band gap shifts that depend strongly on the chiral angle have been observed by optical spectroscopy in single-walled carbon nanotubes (SWCNTs). Uniaxial and torsional strains are generated by changing the environment surrounding the SWCNTs, using the surrounding D2O ice temperature or the hydration stat…
Abstract Plasticized polysaccharide coatings on polypropylene (PP) film were prepared to evaluate the optical and tensile properties of the resulting coated films, as affected by biopolymer and plasticizer types, in order to develop a novel film structure of biopolymer coatings on common plastics intended for food pac…
The morphology and growth behavior of naphthalene, anthracene, and tetracene is studied both experimentally and by computer simulations. We will show that the attachment energy morphology prediction for all compounds gives approximately the correct habit, but that this is merely coincidental. Our Monte Carlo simulatio…
In this research, the discrimination of tungsten and different oxidization states of its oxide has been studied using an electron probe microanalyzer (EPMA), and the results have been compared with those obtained by X-ray photoelectron spectroscopy (XPS). As a result, the relationship between the oxidization state of…
An ordered (2D-hexagonal) mesoporous Mg and Ta mixed oxide (Mg−Ta oxide) is successfully prepared. The mesoporous Mg−Ta oxide is stable after calcination at 773 K for 30 h, and has a BET surface area of 123 m 2 g - 1, pore size of 5.0 nm, and wall thickness of 2.8 nm. Removal of the template by washing in water result…
The electronic structure and the magnetic properties of (Zn,Cr)S, (Zn,Cr)Se and (Zn,Cr)Te are calculated by using the Korringa-Kohn-Rostoker method combined with the coherent potential approximation (KKR-CPA) within the local density approximation. Curie temperatures are calculated by the mean field approximation (MFA…
During attempts to fabricate ZnO nanowires, we accidentally observed the growth of SiO x nanowires on Au-coated Si substrate. Detailed characterizations on the resulting nanowires were carried out by field-emission scanning electron microscopy, electron microprobe analysis, transmission electron microscopy, selective…
Most currently evaluated macromolecular contrast agents for magnetic resonance imaging (MRI) are not biodegradable. The goal of this study is to synthesize and characterize poly(l-glutamic acid) (PG) gadolinium chelates as biodegradable blood-pool MRI contrast agents. Two PG chelates of gadolinium diethylenetriaminepe…
Isotactic polypropylene (iPP) gives very extensive degradation when treated with peroxides above its melting temperature in mechanical mixers or extruders. This undesired reaction is very modestly affected by maleate molecules which on the contrary actively compete with side reactions of macroradicals in the case of e…
Abstract Seeded‐batch crystallization experiments allowing study of the growth and aggregation of the Vaterite modification of calcium carbonate are reported. Results are reported for initial relative supersaturation (σ = S − 1) values in the range 1.66 to 6.70, stirrer speeds in the range 400 and 1200 rpm, and at tem…
Abstract The melt mixing technique was used to prepare various polypropylene (PP)‐based (nano)composites. Two commercial organoclays (denoted 20A and 30B) served as the fillers for the PP matrix, and two different maleated (so‐called) compatibilizers (denoted PP‐MA and SMA) were employed as the third component. The re…
Abstract Chemically synthesized conducting polyaniline (PANI) was investigated as adsorbent for its possible application in the removal of organic dyes, such as methylene blue (MB) and procion red (PR) from their aqueous solution. PANI adsorbent behaves as a charged surface upon post‐synthesis treatment of the polymer…
Molecular dynamics computer simulations have been carried out of a chemically realistic many-chain nonentangled model of glassy atactic polystyrene under the influence of uniaxial mechanical deformation. Both the initial elastic and the postyield (up to 100% of the deformation) behavior have been simulated. The Poisso…
Uniform, hierarchically porous inorganic beads (SiO 2, Al 2 O 3, TiO 2, and ZrO 2 ) have been produced using emulsion-templated polymer beads as templates. The polymer scaffolds were prepared by oil-in-water-in-oil (O/W/O) sedimentation polymerization (Zhang, H.; Cooper, A. I. Chem. Mater. 2002, 14, 4017). The inorgan…
Colloidal ZnSe quantum dots were successfully synthesized from ZnO in a lauric acid/hexadecylamine mixture. X-ray diffraction patterns indicated that the ZnSe quantum dots possess a wurtzite structure. Transmission electron microscope images of the quantum dots showed that the average diameter are in the range of 25∼6…
A number of transition metal (Cr, V, Fe, Cu, Mn, Co, Ni, Mo, and La) incorporated MCM-41 mesoporous molecular sieves with Si/Me = 80 have been synthesized by a hydrothermal method. It was demonstrated that the presence of transition metal salts in the gel during synthesis hinders the action of the template, which resu…
A theory of resonant spin-dependent tunneling has been developed for symmetrical double-barrier structures grown of non-centrosymmetrical semiconductors. The dependence of the tunneling transparency on the spin orientation and the wave vector of electrons leads to (i) spin polarization of the transmitted carriers in a…
We propose a new theoretical interpretation of the electron energy-loss spectroscopy results of Pichler {\it et al.} on bulk carbon nanotube samples. The experimentally found nondispersive modes have been attributed by Pichler {\it et al.} to interband excitations between localized states polarized perpendicular to th…