Materials Literature
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Chemical reasoning based on ligand-field theory suggests that homoleptic cyano complexes should exhibit low-spin configurations, particularly when the coordination sphere is nearly saturated. Recently, the well-known chromium hexacyano complex anion [Cr(CN)6](4-) was shown to lose cyanide to afford [Cr(CN)5](3-) in th…
New coordination polymers {[Ln(tza)3(H2O)2]·mH2O}n (Ln = LaIII1 and PrIII2, m = 2; Ln = NdIII3, m = 1.5) and {[Sm2(tza)6(H2O)5]·H2O}n4 (Htza = tetrazole-1-acetic acid) have been synthesized and characterized by IR spectroscopy, elemental analysis, X-ray crystallography, and magnetic measurements. The Htza ligand coord…
The gene for the D-mandelate dehydrogenase (D-ManDH) of Enterococcus faecalis IAM10071 was isolated by means of an activity staining procedure and PCR and expressed in Escherichia coli cells. The recombinant enzyme exhibited high catalytic activity toward various 2-ketoacid substrates with bulky hydrophobic side chain…
The effect of external electric fields on the photoluminescence intensity of single-walled carbon nanotubes was investigated for individual nanotubes and bulk samples in polymeric films. Fields of up to 10(7) V/m caused dramatic, reversible decreases in emission intensity. Quenching efficiency varied as the cosine of…
Abstract Hybrid composite laminates consisting of polyvinyl alcohol (PVA) as continuous phase (33% by weight) and lignocellulosic fillers, derived from sugarcane bagasse, apple and orange waste (22% by weight) were molded in a carver press in the presence of water and glycerol such as platicizers agents. Corn starch w…
Template co-condensation of 2,3-dicyano-5,7-diphenyl-6H-1,4-diazepine 1 with 10-fold molar excess of phthalodinitrile 2 in the presence of MgII propoxide or butoxide in the corresponding alcohol leads to a mixture of MgII-diazepinoporphyrazines 3–6 from which the low symmetry 3:1 species 3, which contains three annula…
X-ray scattering and electron microscopy were used to characterize the structure of poly(ethylene- alt -propylene- block -ethylene oxide- block-n -hexyl methacrylate) (PEP- b -PEO- b -PHMA) triblock copolymer/aluminosilicate hybrid materials in which the volume fraction of the PEP end-block (0.09 ≤ f PEP ≤ 0.12) was m…
The effect of vascular endothelial growth factor (VEGF) on skin graft survival was studied in rats. Models of skin grafting on muscle and periosteum were designed. For the study of skin grafting on muscle model, 32 rats were divided into 4 groups. VEGF was administrated systemically after skin graft placement intrafas…
In this paper, a computerized method has been proposed for automatic measurement and recognition of yarn wet snarls from an image of snarled yarn samples captured in a water bath. After image acquisition, image conversion and individual snarled sample extraction, the yarn profile function was extracted from the separa…
Abstract Structural and magnetic properties of La 0.7 Pb 0.3 (Mn 1– x Ni x )O 3 (0.1 ≤ x ≤ 0.3) manganites are reported. Samples were fabricated by the sol–gel low‐temperature method. At room temperature, the first structural characterization of all phases indicated the rhombohedral space group ( R $\bar {3}$ c ). All…
Abstract An ethylene‐octene copolymer (POE)/polypropylene (PP) thermoplastic elastomer was prepared through dynamically crosslinking by 2,5‐dimethyl‐2,5‐dilbuty (Peroxy) hexane (DHBP). The effects of DHBP concentration, POE/PP ratio, melt flow index (MFI) of PP, and mixer rotation on rheology and morphology of the the…
Abstract Cast thin films of polyvinyl alcohol/glycogen blends of different compositions have been prepared and subjected to the electrical measurements of both current–time and current–voltage characteristics as well as d.c. conductivity as a function of temperature. The conduction mechanisms operative in the films at…
In this paper we report on computational fluid dynamics (CFD) simulation of airflow inside the nozzles used in Nozzle-Ring spinning. Using the CFD, air velocities at different locations of the nozzle were obtained and then drag forces acting on hair and yarn were computed. Z-twisted carded cotton yarns were produced a…
Abstract Isothermal crystallization kinetics, subsequent melting behavior, and the crystal morphology of short carbon fiber and poly(trimethylene terephthalate) composites (SCF/PTT) were investigated by using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The crystal morphology of the…
Abstract In this Letter we demonstrate that hydrogen‐terminated porous silicon (PSi) layers and powders can serve as highly efficient reductive templates for noble metal salts. The reduction results in metal nanoparticle (NP) formation in the pores of PSi. Gold NP formation has been monitored in‐situ by measuring the…
Abstract We review three commonly used conditions that characterize negative refraction in isotropic dielectric‐magnetic materials. We show that while all the different conditions are equivalent for passive media, they are distinct for different types of active media. © 2008 Wiley Periodicals, Inc. Microwave Opt Techn…
Bimetallic oxalates are layered molecule-based magnets with transition metals $M(\text{II})$ and ${M}^{\ensuremath{'}}(\text{III})$ coupled by oxalate molecules $\text{ox}={\text{C}}_{2}{\text{O}}_{4}$ in an open honeycomb structure. Among the most interesting molecule-based magnets, Fe(II)Fe(III) bimetallic compounds…
Geometrical patterns on armchair nanotubes and their dependence on length (up to 10 nm) have been studied using first-principles methods. The results indicate that finite nanotubes do not show a uniform bond structure. The previous structural classification of armchair nanotubes in Clar, Kekule, and incomplete-Clar ty…
In the case of conventional application of textiles, efficient and permanent fixation of chitosan is of major importance. Cotton fibers were differently pre-treated (alkali treatment, bleaching, demineralization) and then oxidized using differing procedures containing KIO 4 solutions in order to discover which prepara…
The morphological, electrical and rheological characterization of polystyrene nanocomposites containing copper nanowires (CuNWs) functionalized with 1-octanethiol is presented. Characterization by SEM and TEM shows that surface functionalization of the nanowires resulted in significant dispersion of CuNWs in the PS ma…