Materials Literature
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The absorption of a single isolated metal cluster is directly measured using a novel far-field optical technique based on modulation of its position. Single gold nanoparticles with average diameters down to 5 nm, dispersed on a transparent substrate, are optically detected and their absolute absorption cross section d…
Metastable up to 280 K, {MoVCuICuII5} (S=3) forms as a result of intramolecular electron transfer from the MoIV center to one of the CuII termini of the [MoIV(CN)2(CN-CuII(L))6]8+ complex, (1; L=tris(2-aminoethyl)amine) upon light excitation (see picture: Mo yellow; C black; N blue; Cu purple). This process is thermal…
We report on the optical properties of single isolated silver nanodisks and pairs of disks fabricated by electron beam lithography. By systematically varying the disk size and surface separation and recording elastic scattering spectra in different polarization configurations, we found evidence for extremely strong in…
Abstract Graft copolymers of natural rubber and polystyrene were synthesized by free‐radical grafting of styrene monomer onto natural rubber in latex form. The obtained graft copolymers and unsaturated polyester (UPE) resin were mixed and cast at room temperature using methyl ethyl ketone peroxide as an initiator and…
The problem of flammability of upholstered seats has been studied for a long time (Horrocks and Kandola, 1997). The studies resulted in considerable progress in the production of upholstery materials-covering, barrier and filling ones, including those made of natural fibers (Lee, Rowel et al, 1991). The natural raw ma…
Abstract Well casings are subjected to severe corrosion because of their exposure to corrosion environments – seawater, saline formation water, and the corrosive fluids that are transported. Corrosion develops pits and cavities at both the inner and outer walls of the casing. The burst and collapse loads are the most…
Abstract A new interesting category of organometallic polyketones and copolyketones were synthesized via the Friedel–Crafts reaction through the polymerization of 2,6‐[bis (2‐ferrocenyl)methylene] cyclohexanone (II) with different diacid chlorides. The model compound was synthesized by reacting the monomer (II) with b…
Abstract An organic–inorganic hybrid material was prepared through the addition of nanometer fumed silica partly modified by dimethyl dichlorosilane into a water‐borne poly(urethane acrylate) (PUA) anionomer. A PUA/silica hybrid film was made via ultraviolet curing. The mechanical properties of the hybrid film were st…
Abstract The pulse galvanostatic method (PGM) and galvanostatic method (GM) were used to electrodeposit polyaniline (PANI) in H 2 SO 4 solutions. Scanning electron microscopy studies showed that PANI prepared with GM had a granular morphology similar to other researchers' results, whereas nanofibular PANI was prepared…
Abstract Poly(glycidyl methacrylate)/Na–montmorillonite nanocomposites were synthesized by free‐radical polymerization of glycidyl methacrylate containing dispersed montmorillonite. By changing the concentration of glycidyl methacrylate several polymer–clay nanocomposites were prepared and the resulting nanocomposites…
Abstract A group of short glass fiber (SGF) and liquid crystalline polymer (LCP) reinforced polypropylene (PP) hybrid composites and toughened with maleic anhydride (MA)‐grafted styrene–ethylene butylene–styrene (SEBS‐ g ‐MA) elastomers with controlled morphology were designed and injection molded. MA was also grafted…
Advanced decortication technology is based on a simple mechanical process, in which bast fibres are decorticated by impact stress. Hemp, flax and linseed are processed with the same technology that is suitable for both unretted and retted plants. The process includes all stages from the reception of the straw bales to…
Holographic polymer-dispersed liquid crystal reflective structures have been formed using a highly elastic photopolymer. The elasticity allows for mechanical tuning of the reflection notch by over 120nm in the visible spectral range using compressive stress. The shift in the central position of the reflection notch is…
Abstract Summary: Well‐defined pentablock copolymers of styrene–[1]dimethylsilaferrocenophane–methyl methacrylate (PMMA‐ b ‐PFS‐ b ‐PS‐ b ‐PFS‐ b ‐PMMA) are synthesized using lithium naphthalide as initiator and a 1,1‐dimethylsilacyclobutane‐mediated 1,1‐diphenylethylene (DPE) end‐capping technique. Annealing under va…
Abstract Values of the Fano factor are widely scattered in the literature, indicating the difficulties in its determination. We chose to analyze both the escape peaks and parent peaks of Ge detector spectra where the parent peak penetration depth and the escape peak escape depth are much larger than the size of the in…
BaTiO 3 thin films were grown on (001)SrTiO3 by reactive molecular beam epitaxy. Transmission electron microscopy studies showed that there is a high density of dislocation half-loops inside 8- and 12-nm-thick films. By thermal annealing at 1000°C, the isolated small dislocation half-loops grow and combine to form a s…
We report on the controlled fabrication of the arrays of self-organized fingerlike nanostructures of SrRuO3 that form on SrTiO3(001). We show that the size (width and height) of the one-dimensional nanometric units can be tuned or suppressed by using appropriate substrate vicinality θv and surface termination. Critica…
With a recently developed ab initio nonequilibrium Green's function formalism, we have examined the problem of quantum transport through prototypical, short, semiconducting nanotube devices. Metallic behavior is predicted for very short nanotubes, which crosses over to semiconducting behavior as the tube length is inc…
In this work we present a prospective study on the possible use of certain quasicrystalline alloys in order to improve the efficiency of segmented thermoelectric generators. To this end, we obtain a closed analytical expression for their compatibility factor [G. J. Snyder and T. S. Ursell, Phys. Rev. Lett. 91, 148301…
Ba ( Co x , Ti 1 − x ) O 3 thin films were prepared on fused quartz substrate by a sol-gel method. The results of x-ray diffraction showed that the films are perovskite phase and the change of lattice constant caused by different Co concentration is undetectable. Optical transmittance measurement indicated that Co dop…