Materials Literature
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Polycrystalline Zr-doped BiFeO 3 thin films were prepared by a sol-gel spin-coating technique on (111) Pt/Ti/SiO 2 /Si substrates. The films are of single phase as evidenced by X-ray diffraction, and microstructure characterization on the surface and cross-section morphology of the films was carried out by scanning el…
Abstract Nanocomposites based on fluoroelastomer and modified and unmodified sodium montmorillonite clays were prepared. Dynamic mechanical thermal analysis was performed on these nanocomposites over a range of temperatures (−60 to +60°C), frequencies (0.032–32 Hz), and strains (0.002%–2%). The results showed that the…
Abstract The influence of the composition ratio of pimelic acid/calcium stearate bicomponent nucleator on the β crystal form content of isotactic polypropylene (iPP) had been studied at the crystallization temperature of 120°C and duration of 30 min. It was found that the β crystal form content increased continuously…
This paper discusses transport methods for the investigation of the (Ga,Mn)As magnetic anisotropy. Typical magnetoresistance behaviour for different anisotropy types is discussed, focusing on an in depth discussion of the anisotropy fingerprint technique and extending it to layers with primarily uniaxial magnetic anis…
Abstract We review recent experiments at Columbia on electronic transport in graphene nanostructures. We define the graphene nanostructures by e‐beam lithography followed by oxigen plasma etch. In this way we can pattern nanoribbons, rings, as well as other nanostructures. We use this technique to pattern graphene nan…
Abstract Mechanical properties of isotactic polypropylene/wollastonite/styrene rubber block copolymers (iPP/wollastonite/SRBC) composites were studied as a function of elastomeric poly(styrene‐ b ‐ethylene‐ co ‐butylene‐ b ‐styrene) triblock copolymer (SEBS) and SEBS grafted with maleic anhydride (SEBS‐ g ‐MA) content…
With the help of a bis(beta-diketonate) ligand, a family of robust molecules is formed, all consisting of two [Mn(III)4] subunits that interact slightly magnetically with each other, through two bridging pyrazine ligands.
When anchored on a high-area, siliceous supports, nanoparticle catalysts, consisting of two or three different metals, but totaling no more than twenty atoms in all, exhibit exceptional activities and selectivities in solvent-free, one-step hydrogenation reactions at low temperatures (< 420 K) and much lower pressures…
Abstract Hochdurchsatz‐Methoden zeichnen sich gegenüber konventionellen Methoden durch eine größere Effizienz aus. Mittlerweile steht im Bereich der Anorganischen Festkörperchemie und der Materialwissenschaften eine Vielzahl von Werkzeugen zur Verfügung, um die Entdeckung und Optimierung von Materialien durch Verwendu…
Abstract Trans‐RhCl(CO)(TPPTS) 2 [TPPTS, trisodium salt of tri‐(m‐sulfophenyl)‐phosphine] and TPPTS ligands have been cointercalated into zinc–aluminum‐layered double hydroxides (ZnAl‐LDHs) by in situ complexation, and the catalytic performances of the resulting materials for 1‐hexene hydroformylation have been invest…
Abstract Thermoplastic nanofibers in yarn form were prepared by melt extrusion of immiscible blends of cellulose acetate butyrate (CAB) and thermoplastic polymers and subsequent removal of the CAB matrix. Isotactic polypropylene (iPP) nanofiber, with diameters ranging from 75 to 375 nm, were made by using CAB/iPP blen…
Size control of BaTiO3 in solid-state reaction between BaCO3 and TiO2 was demonstrated by varying the size of TiO2 and milling conditions of BaCO3. The smaller TiO2 particles had higher surface area, resulting in faster initial reaction. The mechanically milled BaCO3 particles accelerated the diusion process and decre…
Bismuth Ferrite (BFO) films doped with strontium resulting in a nominal composition of Bi 1−x Sr x Fe 1 O 3 (x = 0–0.15) were fabricated using a sol-gel process on Pt/TiO 2 /SiO 2 /Si substrates by rapid thermal annealed in air at 700°C. A decrease in the grain size (from 1 μm to 90 nm) with increasing Sr concentratio…
We investigated the oxygen vacancies in Lu2SiO5 (LSO:Ce) by using first-principles pseudopotential calculations based on density functional theory. The results indicate that VO5 has the lowest formation energies compared with the other four oxygen vacancies belonging to the SiO4 tetrahedron. The oxygen vacancy can ind…
Abstract In this work the thin polymer films (based on polyvinyl alcohol or carboxymetylcellulose ) containing single‐wall carbon nanotubes synthesized by different methods have been fabricated by a novel technology and studied in detail by UV–VIS–NIR optical absorption and Raman scattering techniques. The films are p…
Abstract The influence of organomodified nanoclay (montmorillonite) on the crystallization and melting mechanisms of isotactic polypropylene (iPP) was studied. Films of both neat polymer and clay nanocomposites were prepared after molecular weight optimization through melt extrusion. Products exhibited the tactoidlike…
Degradable polyurethanes (PUs), based on aliphatic diisocyanates, can be very useful in tissue regeneration applications. Their long-term in vivo degradation has not been extensively investigated. In this study a biodegradable PU with copolyester soft segments of DL-lactide/epsilon-caprolactone and hard segments synth…
Proper cell attachment and distribution, and thus stronger association in vivo between a bone implant and native tissue will improve the success of the implant. In this study, the aim was to achieve promotion of attachment and uniform distribution of rat mesenchymal stem cell-derived osteoblasts by introducing chemica…
Electrochromic thin films of Prussian blue nanoparticles were developed using wet processing. The resultant alkyl-ligand covered nanoparticles disperse well in organic solvents. Consequently, various conventional coating and printing methods can be used in high-quality micro-fabrication to prepare electronic devices.…
The spectral absorption properties of ultrananocrystalline diamond (UNCD)/amorphous carbon composite films grown by pulsed laser deposition with graphite were experimentally investigated. The indirect optical band gaps estimated from the absorption spectrum were 1.0 eV and approximately 5.65 eV, which correspond to th…