Materials Literature
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Abstract In this study we explore the feasibility of using of islands‐in‐the‐sea (I/S) fibers in the spunbond process to produce relatively high strength micro‐ and nanofiber webs. The relationships between the number of islands, percent polymer composition, and the fiber and fabric properties are reported. Nylon 6 (N…
This article demonstrates that the micro-topography of the surface with respect to the pattern size and pitch influences cell adhesion and proliferation. Extensive research has shown the dependence of cell proliferation on substrate chemistry, but the influence of substrate topography on cell attachment has only recen…
We report on controlled nanoscale photopolymerization triggered by enhanced near fields of silver nanoparticles excited close to their dipolar plasmon resonance. By anisotropic polymerization, symmetry of the refractive index of the surrounding medium was broken: C infinity v symmetry turned to C2v symmetry. This allo…
Trimetallic CuNiMo(CN) 8 coordination nanoparticles with a narrow size distribution around 3 nm were obtained. A photoinduced superparamagnetic behavior was evidenced at low temperature by microSQUID studies. The relaxation studies reveal a behavior similar to that observed for single-molecule magnets (SMMs).
Samples of polylactide (PLA) were synthesized by initiating lactide ring opening with glycidol using Sn(Oct) 2 catalyst. Under low-temperature solution polymerization conditions, epoxide ring opening is precluded, leading to predominately linear epoxide capped PLA. With high-temperature bulk polymerization, simultaneo…
Proline dehydrogenase (PRODH) and Delta(1)-pyrroline-5-carboxylate dehydrogenase (P5CDH) catalyze the two-step oxidation of proline to glutamate. They are distinct monofunctional enzymes in all eukaryotes and some bacteria but are fused into bifunctional enzymes known as proline utilization A (PutA) in other bacteria.…
New solvents based on DMSO in combination with alkylammonium fluorides, in particular TBAF . 3H(2)O and BTMAF . H(2)O, were established as media for homogeneous functionalization of cellulose. Even DMSO in combination with freshly prepared, anhydrous TBAF, obtained by the reaction of tetrabutylammonium cyanide and hex…
Blends of chitosan and biodegradable synthetic aliphatic polyesters (polycaprolactone, poly(butylene succinate), poly[(butylene succinate)-co-adipate], poly[(butylene terephthalate)-co-adipate], and poly(lactic acid)) were injection-molded. These samples were immersed in isotonic solution at 37 degrees C for a period…
P-type CuO nanorods were synthesized by a hydrothermal method and the ethanol-sensing properties of sensors based on CuO were investigated. The sensor resistance increased when it was exposed to ethanol and decreased in the air, which is contrary to the case for sensors realized from n-type semiconductor. The resistan…
Annealing effects on the physical properties of ZnO/CdSe core−shell nanowires have been analyzed in the range of 150−400 °C. Annealing at temperatures higher than 350 °C induce a structural transition in nanocrystalline CdSe nanowire shell, from cubic zinc blende to hexagonal wurtzite structure. This transition takes…
Although spliceosomal introns are present in all characterized eukaryotes, intron numbers vary dramatically, from only a handful in the entire genomes of some species to nearly 10 introns per gene on average in vertebrates. For all previously studied intron-rich species, significant fractions of intron positions are s…
Abstract Stepwise solid‐state reaction between LiNH 2 and LiAlH 4 at a molar ratio of 2:1 is investigated in this paper. It is observed that approximately four H atoms are evolved from a mixture of LiNH 2 –LiAlH 4 (2:1) after mechanical ball milling. The transformation of tetrahedral [AlH 4 ] – in LiAlH 4 to the octah…
This paper describes the first material to show the well-known light-induced excited spin-state trapping (LIESST) effect, the metastable excited state of which relaxes at a temperature approaching its thermal spin-crossover. Cooling polycrystalline [FeL(2)][BF(4)](2).x H(2)O (L=2,6-bis[3-methylpyrazol-1-yl]pyridine; x…
Abstract Different density rigid polyurethane foams (RPUF) filled with various expandable graphite loadings were fabricated by cast molding. The flame retardant properties of these composites were assessed by limiting oxygen index and horizontal and vertical burning tests. The results showed that the flame retardant e…
Microelectronics are built from materials whose electrons interact strongly and can exhibit properties as a group that are not seen in any one particle.
Graphite is a layered material showing a strong anisotropy. Among the unconventional properties reported by experiments, the electronic transport along the c-axis, which has direct implications in order to build graphitic devices, remains a controversial topic. We study the influence of inelastic scattering on the ele…
Single-wall carbon nanohorns (SWNHs) are a new class of material that is closely related to single-wall carbon nanotubes. Here, we describe the synthesis and characterization of a series of SWNHs functionalized with ethylene glycol chains and porphyrins. Functionalization of carbon nanohorns has been achieved using tw…
We present a brief review on spin transverse force, which exerts on the spin as the electron is moving in an electric field. This force, analogue to the Lorentz force on electron charge, is perpendicular to the electric field and spin current carried by the electron. The force stems from the spin-orbit coupling of ele…
Activation energies and reaction paths for diffusion and nucleation of mono- and divacancy defects in hexagonal boron nitride layers are theoretically investigated. Migration paths are derived using the nudged elastic band method combined with density-functional-based techniques. We find a different behavior for migra…
Abstract Alginate is an interesting natural biopolymer for many of its merits and good biological properties. This paper investigates the electrospinning of sodium alginate (NaAlg), NaAlg/PVA‐ and NaAlg/PEO‐ blended systems. It was found in this research that although NaAlg can easily be dissolved in water, the aqueou…