Materials Literature
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We report on the interface between graphene and $4\mathrm{H}\text{\ensuremath{-}}\mathrm{Si}\mathrm{C}(0001)$ as investigated by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). It is characterized by the so-called $(6\sqrt{3}\ifmmode\times\else\texttimes\fi{}6\sqrt{3})\mathrm{R}30\ifmmo…
We investigate physical properties that can be used to distinguish the valley degree of freedom in systems where inversion symmetry is broken, using graphene systems as examples. We show that the pseudospin associated with the valley index of carriers has an intrinsic magnetic moment, in close analogy with the Bohr ma…
A new technique to monitor germanium oxygen deficiency centre defects (GeODC) and their relation to the refractive index profile in Ge-Si optical fibre have been developed. This method is based on UV excited luminescence of GeODC in silica based optical fibres. The GeODC defect profiles are unique to the fibre refract…
Well-characterised samples such as single crystals, bi-, tri- or multicrystals are needed for basic studies of properties of solids. Growth of such metallic structures by means of the floatingzone melting technique is demonstrated for iron base alloys, FeAl intermetallics and NiTi shape memory alloy.
The molecular mobility of peroxy radicals at the ends of nonisolated polystyrene chains (NIPSOO) tethered on the solid surface of poly(tetrafluoroethylene) (PTFE) in a vacuum was investigated in the temperature range from 10 to 250 K by electron spin resonance spectroscopy (ESR). The train−tail transition temperature…
The Mg micropowder was mixed and ball milled with ceramic nanoparticles. The material was compacted and then hot extruded. Samples have been deformed in tensile as well as compression tests at temperatures between 20 and 300 °C at a constant initial strain rate. The flow stress is significantly influenced by temperatu…
Abstract Low relative molecular weight trans‐1,4‐polyisoprene oligomers were synthesized successfully by bulk precipitation and solution polymerization with supported titanium catalyst using hydrogen as relative molecular weight modifier. The effects of polymerization conditions on intrinsic viscosity ([η]), catalyst…
Recent reports have identified bulk defects such as oxygen vacancies as key players in visible-light photoactive TiO2. This would imply greater visible light absorption rates may be possible provided effective defect engineering can be achieved. To further this we have developed methods to simulate vacancy formation i…
The increased production of bast fibres (especially hemp fibres) brought about an increase in the amount of waste, namely shive (hemp stalks) and short fibres. This waste presents a potential significant source of high quality cellulose suitable for the production of high-quality papers and chemical cellulose fibres.…
This paper deals with an experimental investigation of the effect of various microdefects induced by equal-channel angular pressing (ECAP) on mechanical and creep properties of ultrafinegrained pure aluminium, an Al-0.2%Sc alloy and copper.
Silver objects obtained from archaeological excavations often exhibit an extended embrittlement. The causes of this embrittlement were studied on silver artefacts buried for more than one thousand years in the soil using light and electron microscopy techniques and EDX microanalysis. Our investigation revealed presenc…
Abstract The coagulation dynamics of acrylic polymer (PAN) with 1‐butyl‐3‐methylimidazolium chloride [BMIM]Cl as solvent for PAN and H 2 O as nonsolvent was investigated in detail. On the basis of Fick's second law of diffusion, a mass‐transfer model of [BMIM]Cl from concentrated PAN/[BMIM]Cl solution was established…
Three-dimensional finite element simulations were used to investigate the influences of various hot filaments and other deposition parameters on the temperature field of substrates which affect significantly the growth and quality of diamond films by hot filament chemical vapor deposition (HFCVD) and based on the simu…
Hole wavefunctions and energy spectra have been calculated in a silicon quantum dot with a shallow acceptor. Within the framework of the envelope function approach we have found anomalously strong splitting of the energy levels caused by the Coulomb and the spin–orbit interactions as compared to bulk silicon. If the q…
The real and imaginary parts of the ac susceptibilities of powder BiMnO 3 and BiMn 1− x Sc x O 3 ( x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7) samples have been measured as functions of temperature, different driving ac and applied dc magnetic fields, and different ac magnetic field frequencies. Both χ ' versus T and χ '' v…
Magnetic-cation-doped three-layer Aurivillius phases Bi2-xSr2+x(Nb/Ta)(2+x)M1-xO12, x approximate to 0.5 and M = Ru4+, Ir4+ or Mn4+, are shown to have the same orthorhombic space group symmetry and similar dielectric and ferroelectric properties as their (non-magnetic) ferroelectric parent compounds Bi2-xSr2+xNb2+xTi1…
Abstract Copper impregnated mesoporous activated carbon catalyst was applied for the elimination of microorganisms in wastewater. The antibacterial activity of the catalyst was determined qualitatively by testing the removal of pathogens in water after contacting with the catalyst. Escherichia coli, Shigella flexneri,…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract Two kinds of amphiphilic dendronized conjugated polymers, polyfluorene (PF) and poly(binaphthyl‐ alt ‐fluorene) (PBF), were synthesized by Suzuki polycondensation of hydrophobic macromonomers with two nonpolar octyloxy chains and hydrophilic macromonomers with two polar oligo(ethylene oxide) chains. In these…
This study was aimed at evaluating the effects of reaction pressure and temperature on toluene disproportionation using a ZSM-5-based catalyst impregnated with molybdenum. The results of the study showed that both toluene conversion and xylene selectivity were strongly dependent on temperature, pressure, and the kind…