Materials Literature
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The surface-plasmon properties of Au bipyramids are investigated using the finite-difference time-domain method. It is found that both the extinction cross sections and local electric-field enhancements of Au bipyramids are larger than those of Au nanorods that have longitudinal surface plasmon (LSP) wavelengths close…
Round the twist: Metalation of [36]octaphyrin 1 provided the Möbius aromatic Pd2 complex 3 as well as the Hückel antiaromatic Pd2 complex 2. This method can be applied to other expanded porphyrins and Group 10 metal ions. The aromatic/antiaromatic character was supported by NMR spectrscopy, NICS calculation, and two-p…
We have developed a versatile nanoparticle construct using a compact cysteine coating on a CdSe(ZnCdS) core(shell) nanocrystal (QD-Cys) that is biologically compatible, exceptionally compact, highly fluorescent, and easily functionalized. The small hydrodynamic diameter of QD-Cys ( approximately 6 nm) allows for renal…
A polymer brush with chains consisting of anisotropic monomers, in a liquid consisting of free spherical particles, is studied by the molecular dynamics method. It is shown that, at some value of the concentration of spheres, a liquid-crystal or oriented-domain transition occurs in the brush. A densely-grafted brush a…
DL-Oligo(lactic acid) (OLA) readily reacts with poly(1,4-butylene terephthalate) (PBT) in the melt leading to the formation of high molecular mass poly(1,4-butylene terephthalate-co-DL-lactide) (BLA) copolymers. The analysis from 1H NMR reveals that transesterification between butylene terephthalate (BT) and lactide (…
Abstract In this paper, we did a study of the effect of the presence of BIT (Bi 4 Ti 3 O 12 ) in the dielectric and optical properties of the CaCu 3 Ti 4 O 12 (CCTO) thick films. The films were prepared by the solid sate procedure. Mechanical alloying followed by the solid state procedure has been used successfully to…
Abstract This article describes the properties of composites using unplasticized PVC matrix and wood flour (obtained by crushing the bark of Eugenia jambolana ) as filler. Composites were prepared by mixing PVC with varying amounts of wood flour (ranging from 10–40 phr; having particle sizes of 100–150 μm and <50μm…
Two series of thermally modified thermoplastic polyurethane elastomers (TPU)s based on poly(oxytetramethylene glycol) (PTMG) (PT samples), and poly(oxyethylene glycol) (POE) (PO samples) were synthesized from 4,4'-methylene-bis-(4-phenylisocyanate) (MDI) and an aromatic diacid, bis( p-amido benzoic acid)- N-trimellity…
Ab initio modeling of the Li-B-H system and analysis of the available experimental data on the ${\mathrm{Li}}_{x}{\mathrm{B}}_{1\ensuremath{-}x}$ compound $(x\ensuremath{\approx}0.53)$ have allowed us to identify a potential route for the synthesis of hydrogen-rich LiBH $(5.4\phantom{\rule{0.3em}{0ex}}\mathrm{wt.}\pha…
In order to simplify the design and to further improve the integration, programmable, three-dimensional circuits are required alongside the development of fine process technology. We demonstrate the operation of programmable logic gates using organic ferroelectrics. Three-dimensionally stacked organic ferroelectric ca…
Abstract In situ reactive compatibilization was first time applied to a low melting nylon (nylon 6 and 66 copolymer) and EPDM blend system. The effects of in situ compatibilization and concentration of compatibilizer on the morphology and mechanical properties of nylon/EPDM blends have been investigated. The influence…
Abstract Polypropylene/bagasse fiber composites were prepared by compounding polypropylene (PP) with bagasse fibers as reinforcing filler. Surfaces of fibers were modified through the use of silane coupling agents (Vinyltrimethoxysilane and γ‐Glycidoxypropyltrimethoxysilane). The fiber coating was performed by mixing…
Alkylketene dimer (AKD: a kind of wax) spontaneously forms a fractal structure and its surfaces show super water-repellency (the contact angle = 174°). However, the formation mechanism of the fractal surfaces of AKD is still unclear. In this work, surface structures, wettability and phase behaviors of various waxes ha…
Proximity coupled interdigitated sensors are introduced to detect insulation damage in power system cables. A new empirical model for interdigitated sensors with conducting backplane is developed. The validity of this newly proposed model is verified by comparing the results obtained from the new model with simulation…
Ultraviolet photoconductivity in zinc oxide (ZnO) nanoneedles grown on the surface of a multilayer structure comprised of ZnO film (50 nm)/Zn layer (20 nm)/ZnO film (2 μm) fabricated on a stainless steel substrate using an unbalanced magnetron sputtering technique is reported. It was observed that the multilayered str…
Abstract The specimens containing different volume fractions of ultrafine fly ash in LDPE were prepared with the help of two roll mixing mill and the hot‐plate compression‐molding machine. Thermal and rheological properties were evaluated using DSC and parallel‐plate rotational‐rheometer. The effect of composition var…
Abstract Argon plasma‐pretreated polyimide (PI) films were subjected to UV‐induced surface graft copolymerization with 4‐vinylpyridine(4VP) under atmospheric conditions. Electroless plating of silver was carried out effectively on the 4VP graft copolymerized PI (PI‐g‐P4VP) surface after PdCl 2 activation and in the ab…
In spite of a renewed interest in Nuclear Quadrupole Resonance (NQR), especially of nitrogen-14 (for instance, for the detection and characterization of explosives), a full NQR instrument, ready to use in the laboratory, is not commercially available. We describe here an entirely homemade spectrometer, reasonably tran…
Quasialigned, single-crystal Zn1−xMgxO (x=0–0.32) nanorods were synthesized on Si substrates by thermal evaporation. Zn1−xMgxO nanorods grew along the [0001] crystal direction and had uniform hexagonal planes with diameters of 420–120nm. The predominant ultraviolet luminescence could be tuned from 379 (x=0) to 305nm (…
The low- and high-temperature gas sensing behavior of hydrogenated diamond (HD) and metal oxide (MOx) materials is compared and contrasted. We present evidence that at room temperature and above both kinds of materials are coated with a thin surface electrolyte layer in which gas molecules can be adsorbed and in which…