Materials Literature
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Fluorescence from a layer of Rhodamine 6G (R6G) is observed to be enhanced strongly if a dielectric grating deposited onto a gold film is used as a substrate. The fluorescence enhancement has been studied as a function of the grating periodicity and the angle of incidence of the excitation light. The enhancement mecha…
The UV-Vis and fluorescence spectra of free base and diprotonated meso-tetrathien-2'-ylporphyrins are, when compared to the spectra of meso-tetra-phenyl- or even -thien-3'-ylporphyrins, characterized by surprisingly large red-shifts. A comparison of the optical spectra and the computed rotational barriers for these me…
We present a novel method to produce pure rutile nanotubes using a sacrificial carbon nanotube template.
Purpose Proposes a new quasi-static vector hysteresis model based on an energy approach, where dissipation is represented by a friction-like force. Design/methodology/approach The start point is the local energy balance of the ferromagnetic material. Dissipation is represented by a friction-like force, which derives f…
The influence of material factors on the intergranular stress corrosion cracking (IGSCC) susceptibility of austenitic stainless steels under hydrogenated high-temperature water were studied using the constant extension rate technique (CERT) using specimens with a cold deformed hump. A remarkable and beneficial effecti…
Intertwining triple helical nanofibers with an overall handedness have been formed from self-assembling chiral benzene-1,3,5-tricarboxamides , and , whereas the achiral benzene-1,3,5-tricarboxamide upon self-association gives rise to straight nanofibers without any twist and transmission electron microscopy images of…
Electrochemical transistors based on conjugated polymers are proposed as a path to printed electronics on paper. The electrochemical doping/dedoping of conjugated polymers clearly plays a role in the current vs potential characteristics of these devices, however, the mechanism of current saturation (often referred to…
The phase transition from tetragonal to rhombohedral phase in sodium bismuth titanate (NBT) is studied by means of neutron scattering. It is found that the rhombohedral phase has incommensurate modulation along the four-fold axis of the precursor tetragonal phase. The appearance of the incommensurate modulation is dis…
Abstract This article describes different types of titanium alloys, including alloy Ti-6Al-4V, alpha and near-alpha alloys, and alpha-beta alloys. It explains the formability of titanium alloys with an emphasis on the Bauschinger effect. The article provides information on the tool materials and lubricants used in the…
Primary aminoporphyrin, secondary bis(porphyrinyl)amine and hydroxyporphyrin complexes have been isolated and characterised both spectroscopically and crystallographically from the reaction of 5-bromo-10,15,20-triphenylporphyrinatonickel(ii) with hydrazine under palladium catalysis.
Preparation of highly oil dispersed MgO nanoparticles (NPs) was carried out at room temperature via precipitation of Mg(OH)2 from aqueous media using Mg(NO3)2 as a starting precursor and NaOH as a precipitant. The Mg(OH)2 precursor was converted into MgO particles having face-centered cubic structures through calcinat…
Polycatenar oligothiophenes possessing three alkoxy chains at each terminal self-organise into columnar liquid crystalline phases, and one-dimensional columnar stacks can be oriented uniaxially by mechanical shearing in the mesophases.
With the use of PVP (polyvinylpyrrolidone) as capping reagent, cubic, octahedral and spherical Cu2O nanocrystals were obtained in aqueous media when different reducing agents were applied. After adding selenium sources at room temperature, these nanocrystals could be converted (based on the Kirkendall effect) into hol…
Optical properties of metal (Al, Ag, Sb, and Sn)-ion-implanted ZnO films have been studied by ultraviolet-visible spectroscopy and spectroscopic ellipsometric techniques. The effects of metal-ion doping on the optical band gap (Eg), refractive index (n), and extinction coefficient (k) of nanocrystalline ZnO films have…
Hermann Seibert of Röhm GmbH & Co KG discusses the use of PMI foams in large sandwich components in state-of-the art satellite launchers and in structural applications for rotor craft and civil aircraft.
The phenomenology of Pb(B,B′)O3 perovskite-based relaxor ferroelectrics (RFE) is reviewed, with emphasis on the relationship between chemical short-range order and the formation of polar nanoregions in the temperature range between the “freezing” temperature, T f, and the Burns temperature, T B. Results are presented…
The electrospinning of hexanoyl chitosan (H-chitosan), polylactide (PLA) and their blends was performed using chloroform, dichloromethane or tetrahydrofuran as a spinning solvent. The as-spun PLA fibers appeared to be cross-sectionally round, with rough surface morphology, while the as-spun H-chitosan fibers were flat…
BACKGROUND: Magnetic resonance imaging provides a noninvasive method to study the fate of transplanted cells in vivo. OBJECTIVE: We studied the fate of embryonic and mesenchymal stem cells labeled with iron oxide nanoparticles (Endorem) and human CD34+ cells labeled with magnetic MicroBeads (Miltenyi) in rats with a c…
We developed a multidimensional GAs Multicomponent Mixture Analysis (GAMMA) code in order to investigate chemical reaction behaviors related to an air ingress accident and the thermofluid transients in high-temperature gas-cooled reactors. The implicit continuous Eulerian technique is adopted for the reduction of a 10…
Carbon nanotubes (CNTs) have been the forefront of nanoscience and nanotechnology due to their unique electrical and mechanical properties and specific functions. However, due to their poor solubility in solvents, the applications using the materials have been limited. Therefore, strategic approaches toward the solubi…