Materials Literature
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In this study we investigate the electronic transport, the optical properties, and photocurrent in two-dimensional arrays of silicon nanocrystals (Si NCs) embedded in silicon dioxide, grown on quartz and having sizes in the range between less than 2 and 20 nm. Electronic transport is determined by the collective effec…
A generalized computational methodology is developed and applied to study multiscattering phenomena associated with an aggregate of multilayered nanoshells under excitation of a plane wave. The development is based on a combination of the vector addition theorem for spherical wave functions and the efficient recursive…
A fast preparation process for high-quality as-grown ZnO nanorods by electrodeposition from an aqueous solution of Zn(NO 3 ) 2 and NH 4 NO 3 at 75 °C was established. The vertical growth rate of the ZnO nanorods was enhanced with an increase in the NH 4 NO 3 concentration. The NH 3 adsorbed on the ZnO nanorods’ surfac…
New (chalcogenoethyl)ferrocenylcarboxalate functionalized silver chalcogenide nanoclusters were synthesized using a combination of silylated chalcogen reagents at low temperatures. The addition of E(SiMe(3))(2) to reaction mixtures of FcC{O}OCH(2)CH(2)ESiMe(3) (E = S, Se) and (Ph(3)P)(2)·AgOAc affords nanoclusters wit…
Abstract A series of biodegradable isosorbide‐based copolyesters poly(butylene succinate‐ co ‐isosorbide succinate‐ co ‐polyethyleneoxide succinate) (PB x I y E z S) were synthesized via bulk polycondensation in the presence of dimethyl succinate (DMS), 1,4‐butanediol (BDO), poly(ethylene glycol) (PEG) and isosorbide…
Mach 'nen Abgang: Einfach herzustellende Triflat-Bor-Subphthalocyanine sind hochreaktive Substrate für die effiziente Substitution des axialen Liganden gegen Sauerstoff-, Schwefel-, Stickstoff- und Kohlenstoff-Nucleophile (siehe Bild).
Aluminum-doped ZnO (ZnO:Al, AZO) thin films were prepared on glass substrates by dc reactive magnetron sputtering from a Zn–Al alloy target at room temperature. The effects of the Ar-to-O2 partial pressure ratios on the structural, electrical, and optical properties of AZO films were studied in detail. AZO films grown…
Kinetic analysis including mass-transfer processes of the title reaction was carried out on the basis of the effects of the solution agitation rate, reaction time, and H 2 and O 2 partial pressures. The suggested equations were found to be in sufficient agreement with the experimental values. The reactions were then s…
Abstract Adding conductive carbon fillers to thermoplastic polymers increases the resulting composite's electrical conductivity. Carbon black (CB) is very effective at increasing composite electrical conductivity at low loading levels. In this study, varying amounts (2 to 10 wt %) CB were added to polycarbonate (PC) a…
Abstract Recently, various bio‐medical applications of nanoporous silicon (np‐Si) have been suggested. This work investigates the biocompatibility of np‐Si particles taking into account hazardous residua confined in the pores after preparation. The emphasis is on the potential application of such particles as oxygen p…
We study the electronic properties of electrons in flat and curved zigzag graphene nanoribbons using a tight-binding model within the Slater Koster approximation, including spin-orbit interaction. We find that a constant curvature across the ribbon dramatically enhances the action of the spin-orbit term, strongly infl…
An optical method was proposed, based on the ratio of color difference, to identify the thickness of graphene on dielectric/Si substrates. The effect of light source on the color difference of graphene sheets has been investigated. The result shows that for the number of graphene layers N ≤ 10, the ratio between the c…
A simple, high throughput fractionation procedure for aqueous/SDS (sodium dodecyl sulfate) suspensions of single-walled carbon nanotubes (SWNTs) is presented, which yields thin bundles of semiconducting-SWNTs with small chiral angles. To demonstrate this we show the photoluminescence signatures of nanotube suspensions…
Plane-wave density functional theory was used to study the properties of oxygen vacancies and interstitials, with different charge states, in MgO. The calculated properties were the relaxed configurations, the Frenkel defect formation energies and the energies of the migration barriers, and all properties were found t…
Recycling waste tires being important for both economical and environmental reasons, ground tire rubber can be blended with other polymers, modifying their properties. In order to characterize and explain these modifications, an experimental study was carried out concerning the improvement in the dynamic damping prope…
Abstract The rising interest in polymer nanocomposites leads also to an increasing concern for their photo‐oxidation resistance. The main properties and photo‐oxidation behaviour of polypropylene‐based microcomposites and nanocomposites were investigated. The results show that the use of nanosized calcium carbonate ma…
Luminescence enhancement (LE) and quenching for lanthanide (Ln) doped nanocrystals is obtained by a second Ln(3+) ion doping method. Singly or doubly doped LaOF, LaF(3) and NaYF(4) nanocrystals are studied in detail under selective or two-color excitations. The underlying reason for LE by codoping is explored, and a m…
The internal surfaces of modern submerged entry nozzles (SENs) were coated with a glass/silicon powder layer to prevent SEN graphite oxidation during preheating. The effects of the interaction between the coating layer and the SEN base refractory materials on clogging were studied. The results indicated that penetrati…
Experimental and computational studies of the solvent dependence of the first molecular hyperpolarizability (β) for two donor-bridge-acceptor chromophores (CLD-1 and YLD156) are presented. Hyper-Rayleigh scattering (HRS) measurements are performed with 1907 nm excitation in a series of solvents with dielectric constan…
Abstract Silicates doped with catalytic species have only been slowly adopted by the fine chemicals and pharmaceutical industries, in spite of their remarkable and unique properties such as pronounced physical and chemical stability; high (enantio)selective activity and ease of materials production and application. Th…