Materials Literature
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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…
Abstract The degradation of PI film irradiated with VUV in a wavelength of 5 to 200 nm is investigated. The results show that transparency of PI film decreases obviously after irradiation and more obviously for the film irradiated with VUV of higher intensity. In addition, the absorption line red‐shifts for the PI fil…
Using in situ high-pressure x-ray diffraction methods, the compressibility of 30nm 3C–SiC nanocrystals was studied under hydrostatic conditions while helium was used as pressure transmitting medium, as well as under nonhydrostatic conditions without pressure medium. No threshold pressure phenomenon was observed for th…
Abstract Latex based on fluoroacrylate (TAN) and other comonomers was prepared via miniemulsion polymerization in the presence of stearyl trimethyl ammonium chloride (STAC) and 2, 2′‐azobis (2‐amidinopropane) dihydrochloride (ABAP) as a water soluble initiator. Light transmittance studies demonstrated that the light t…
For a deeper insight into the structure of Bombyx mori silk fibroin, some model peptides containing tyrosine (Y), valine (V), and serine (S) in the basic (AG)n sequence were synthesized by the solid-phase method and analyzed by Raman spectroscopy in order to clarify their conformation and to evaluate the formation and…
The blueshift of the optical absorption edge along with the intense red photoluminescence (PL) peak has been observed from micron-long crystalline silicon nanowires prepared by pulsed-laser vaporization of heated Si (mixed with metal catalyst) targets. Previous studies on the confinement in silicon nanostructures resu…
Aluminum-induced layer exchange (ALILE) was used to crystallize amorphous silicon–germanium (a-Si1−xGex) alloys. A bilayer structure of aluminum (Al) and a-Si1−xGex was deposited on quartz substrates and annealed below the eutectic temperature of the binary Al–Ge alloy (420°C). The annealing process results in an almo…