Materials Literature
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Dislocation junctions and jogs in a free-standing FCC thin film have been studied using three-dimensional dislocation dynamics simulations. Due to the unconstrained motion of surface nodes and dislocation annihilation at the free surface, junctions and jogs are unstable except for some uncommon conditions. If the film…
Sulfur (S) is introduced as an additive in the growth atmosphere of carbon nanotubes (CNTs) in the range of 940-1020°C. CNT products with distorted sidewalls can be obtained by S-assisted growth. Moreover, many fascinating CNT structures can also be found in samples grown with S addition, such as bamboo-like CNTs, twi…
Abstract The viscoelastic relaxation of linear styrene–butadiene–styrene triblock copolymer ( l ‐SBS) and star styrene–butadiene–styrene triblock copolymer ( s ‐SBS) with four arms were investigated with differential scanning calorimetry and dynamic rheological measurements. Three characteristic viscoelastic responses…
The fabrication of three kinds of ZnO nanowire arrays with different structural parameters over Au-coated silicon (100) by facile thermal evaporation of ZnS precursor is reported, and the growth mechanism are proposed based on structural analysis. Field emission (FE) properties and wetting behavior were revealed to be…
Abstract The effects of organoclay type, compatibilizer, and the addition order of components during melt‐blending process on the morphology and thermal, mechanical, and flow properties of ternary nanocomposites based on low‐density polyethylene (LDPE) were investigated. As a compatibilizer, ethylene/methyl acrylate/g…
Abstract Undoped and 0.56 at.% Sb‐doped ZnO thin films were prepared by pulsed laser deposition (PLD) under vacuum and an oxygen pressure of 0.2 Pa with sintered ceramic as targets. The effects of Sb doping and deposition atmosphere on structure and optical–electrical properties of the films were studied by X‐ray diff…
Schwarzes Gold – aber kein Öl: Ein nanoporöser schwarzer Goldfilm bildet sich durch Anodisierung von Gold in einer Oxalatlösung. Der schwammartige Film ist porös mit einer gleichförmigen Lochgröße von ca. 20 nm (siehe Bild). Der Bildungsmechanismus ist noch unklar, wahrscheinlich tragen aber Kohlenstoff-Formen, die du…
Abstract High‐molecular‐weight copolyesters based on poly(butylene terephthalate) as rigid aromatic segments and poly(l‐lactic acid) (PLLA) as degradable aliphatic segments were synthesized via the polycondensation of terephthalic acid, 1,4‐butanediol (BDO), 1,4‐cyclohexanedimethanol (CHDM), and PLLA oligomer. By tail…
Recent investigations have added to and refined the understanding of the behavior of broadband antireflection coating designs and provided further guidance for achieving more nearly optimal designs. The ability to optimize designs wherein the overall optical thickness of the design is constrained to a specific value h…
Silence, please! Single-wall carbon nanotubes (NTs) are produced as a mixture of metals and semiconductors. Metallic NTs can be selectively derivatized by diazonium, but the selectivity does not allow preservation of semiconductor NTs; therefore, diazonium was replaced by diazoesters. The diazoester-coupled NTs could…
Abstract Germanium nanocolumns grown by glancing angle deposition on Si(100) substrates and prepatterned substrates comprising of SiO 2 nanospheres demonstrated an altered morphology that is greatly influenced by the substrate temperature ( T S ). Surface diffusion‐driven mass transport and increased adatom mobility a…
ZnO/TiO 2 core−shell nanostructures were prepared by a hydrothermal method and magnetron sputter technique. The annealing effect on the microstructure of the prepared samples and the phase transformation of the covered TiO 2 shell layer were investigated systematically. It was observed that a special TiO 2 -II phase s…
Lattice dynamics calculations and a high-pressure Raman scattering study of nanocrystalline Bi(2)MoO(6), a member of the bismuth-layered Aurivillius family of ferroelectrics, are presented. These studies showed the onset of two reversible second-order or weakly first-order phase transitions near 2.5 and 4.5 GPa as wel…
The photoluminescence (PL) of silica nano-structures has been found to be affected remarkably by organic solvents and hydrogen peroxide. The absorption and PL emission as well as excitation spectra show a variation in the position of the spectral maxima, with the change in the solvent polarity. The most interesting ef…
Abstract One of challenges in improving the performance and cost‐effectiveness of SOFCs (solid oxide fuel cells) is the development of suitable interconnects materials. Chromia‐forming alloys and especially ferritic stainless steels, like Crofer22APU, are considered to be among the most promising candidate materials a…
We extended the analysis of a variational theory for nematoacoustics recently proposed by Virga [Phys. Rev. E 80, 031705 (2009)] by allowing the nematic director to vibrate about an average orientation at the frequency of a propagating wave, a periodic motion that we call the director libration. The acoustic susceptib…
The effect of molecular topology on the structural and dynamic properties of dendrimers with different generation numbers and molecular weights is studied in solvents of varying solvent quality and compared with the behavior of linear polymer chains of similar molecular weights. Brownian dynamics simulations are used,…
The size effect of Pd clusters on hydrogen adsorption was investigated by density functional theory calculations. From molecular dynamics simulations, we found that the hydrogen molecules were dissociatively adsorbed on the Pd clusters; the most stable adsorption site was the hollow site. We also found that the adsorp…
Abstract In this study, Desulfobulbus propionicus ( D. propionicus ), a sulfate reducing bacterium (SRB) was isolated and identified in cooling towers by molecular biologic techniques. This bacterial species has been reported for the first time in the cooling towers of an Indian petroleum refinery. Corrosion behaviors…
Abstract Up to date, only a few kinds of poly (azomethine‐urethane)s (PAMUs) derived from aromatic hydroxy compounds were obtained and studied with thermal degradation steps. Novel PAMUs were prepared using the hydroxy‐functionalized Schiff bases derived from melamine and toluene‐2,4‐diisocyanate. Schiff base prepolym…