Materials Literature
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Abstract Summary: Nanocomposite films were prepared by two methods in which lead sulfide (PbS) nanocrystals were contained in an organic matrix. One method used a wet chemical synthesis of the nanocrystals in the direct presence of a polymer, where the polymer controlled nanocrystal growth. The second method was gaseo…
Sapphire (α-Al 2 O 3 ) single crystals grown using the Verneuil and Kyropoulos methods have been analyzed using electron paramagnetic resonance and γ-ray spectroscopy with 12-MeV bremsstrahlung excitation. It is established that uncontrolled impurities in the final sapphire single crystals grown by the Kyropoulos meth…
Catalytic performance of gallia-supported iridium catalysts in the reaction of selective hydrogenation of crotonaldehyde in the gas phase was studied and compared to that of platinum and ruthenium catalysts. The best catalytic properties in terms of the selectivity to crotyl alcohol are shown by 5 wt % Pt/α-Ga2O3 and…
The authors used a complement of depth-resolved cathodoluminescence spectroscopy (DRCLS), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM) to correlate the formation of native point defects with interface chemical reactions as well as surface morphology. A wide array of ZnO crystals grown by bot…
Based on the kinetic model and the dielectric response theory, a theoretical model is put forward to describe the transport of protons along nanotube axes. With the introduction of electron band structure for different nanotubes like zigzag and armchair nanotubes of metallic properties, the collective excitation of el…
The design of a tritium processing loop for KATRIN tritium source and results of test set-up operation are presented. The constant source intensity is supported by high purity (> 95% of tritium) of tritium circulated through the source with 4.8·10-4 g/s rate. The possibility of source parameters stabilization was veri…
Zinc coatings are proved to be corrosion resistant as they react with atmospheric compounds forming an adherent film on their surface. This work investigates the feasibility of zinc deposition on low alloy steels by pack cementation at temperatures from 380 to 450°C. The effect of zinc concentration in the pack powder…
Due to the increase in the applications of foils, fibres, and yarns under dynamic loading, characterizing the behaviour of small-scaled material samples at high strain rates has become important. However, owing to the low mechanical impedance and the small size of such samples, the conventional split Hopkinson bar tec…
Structural relationships between icosahedral hydrocarbon nanostructures and their one-dimensional counterparts have been derived. The structural, electronic, and mechanical properties of fulleranes and icosahedral diamondoids, together with the predicted perhydrogenated carbon nanotubes and polyicosahedral diamond nan…
The structural stability and theoretical strength of a Au face-centered cubic (FCC) crystal under uniaxial loading is investigated by combining the modified analytical embedded atom method (MAEAM) with Born stability criteria. The results show that under sufficient compression, there exists a stress-free body-centered…
The purpose of this study was to evaluate the physical and mechanical properties of environmentally-friendly films for fresh-cut lettuce. This objective was achieved by determining the gas transmission rates for oxygen, water vapor, carbon dioxide, and the thermal and mechanical properties of the films following ASTM…
Multi‐hydroxyl end‐groups poly(ethylene glycol) (PEG) was prepared from PEG and epichlorohydrin. Then, PEG‐supported poly(lactic‐ran‐glycolic acid) (PLGA)n‐PEG‐(PLGA)n (n=1, 2, 4) linear‐dendritic barbell‐like copolymers were synthesized through direct polycondensation under bulk condition from the multi‐hydroxyl end‐…
The spunlacing technique for producing auto interior nonwovens is examined. A 50/50 flax/polypropylene nonwoven is processed using an AquaJet spunlace system with two different spunlacing settings. The spunlaced nonwovens are thermally bonded into 2D and 3D interior parts by a panel press and a stamp-forming press. Ph…
Abstract Summary: The effect of humidity on the ammonia gas (NH 3 ) detection of conducting composite films was investigated. The first results showed that the presence of humidity, acting as interference gas, modifies the behaviour of sensors in the presence of ammonia. However, the behaviour study at atmosphere with…
Donor/acceptor systems for electron and energy transfer are fabricated within modified multilayer nanotubes by taking advantage of the precise layering of the surface sol−gel method. Molecular thick layers of dye-embedded metal oxides were successively fabricated on the pore of anodized aluminum oxide (AAO) membrane,…
Abstract Foam index tests can be used to predict the air-entraining admixtures dosages for concrete containing fly ash. No industry-accepted foam index test standard exists and widely different methods have been used in research and industry. Four foam index test variants were compared to determine if variations of th…
A structural characterization of host-guest supramolecular copolymers, formed by an adamantane dimer and two beta-cyclodextrin trimers in aqueous solution, has been carried out by combining small angle X-ray scattering and light scattering experiments. A shape-reconstruction method was applied to the SAXS data to obta…
The characteristics of amorphous-to-crystalline phase transformation in the hydrogenated Ge 2 Sb 2 Te 5 and Ge 8 Sb 2 Te 11 thin films were investigated by X-ray diffraction (XRD), optical transmittance ( T OP ), and nano-pulse reflection response. The hydrogenation was conducted under a H 2 pressure ( P H ) of 20 atm…
The effects of the cyano-substituted aromatic nonmesomorphic additives N-(3,4-dicyanophenyl)-4′-nonyloxybenzamide (I), 3,4-dicyanophenyl-4′-nonyloxybenzoate (II), 3,4-dicyanophenyl-3′,4′,5′- tris -(4″-undecyloxyphenylbenzoate)benzoate (III), and 4-(6-hydroxyhexyloxy)benzonitrile (IV) on the dielectric properties of 4-…
Drop/impact causes high strain rate deformation in solder joints of microelectronics package. It is important to understand mechanical behavior of solder joints under high strain rate for reliability design of products. In this paper mechanical behaviors of two lead-free solder alloys, Sn3.5Ag and Sn3.0Ag0.5Cu, were i…