Materials Literature
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The magnetic properties and clustering behaviors of the transition-metal (TM)-doped ZnO have been studied by first-principles calculations. We demonstrate the relationship between the types of TM (Co, Fe, Ni, and Cu) pairs and the energetic most stable configurations in ZnO:TM. Further calculations show that Co pairs…
The luminescence properties of CaF2 nanoparticles with various sizes (20–140 nm) are studied upon the excitation by VUV and x-ray quanta in order to reveal the influence of ratio of mean free path and thermalization length of charge carriers and nanoparticle size on the self-trapped exciton luminescence. The luminesce…
Hyper‐Raman scattering (HRS) is performed in v ‐SiO 2 , and the results are compared to RS and infrared absorption data. Mode analyses are tested based on two models, either the local C 2 v symmetry of the Si–O–Si bonds or the T d symmetry of the SiO 4 tetrahedra. The HRS boson‐peak (BP) signal is dominated by the qua…
The interaction of electromagnetic radiation in X and Ka bands with magnetic nanocomposite of disordered carbon nanotubes arrays has been investigated both experimentally and theoretically. Samples were synthesized on the quartz reactor walls by decomposition of ferrocene and xylene which provided random intercalation…
EVOH/clay nanocomposite films were prepared by using four types of surfactants to treat surface of clay because the surfactants were expected to affect the degree of clay dispersion in the EVOH matrix, which would in turn affect the properties of film. The nanocomposite films that contained the single alkyl tail with…
Hydroxyl-terminated polyurethane (EPPU) modified by epoxy resin was synthesized. The structure of polyurethane (PU) was characterized by Attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR) and transmission electron microscope (TEM). The effect of w(E-44) on thermal stability and mechanical p…
Green and efficient synthesis of new chiral and thermally stable poly(amide-imide) (PAI) nanostructures was attained. Thus, polycondensation reaction of 3,5-diamino-N-(4-hydroxyphenyl)benzamide (4) with different chiral amino acid-based diacids (3a-3d) in the presence of small amount of molten tetrabutylammonium bromi…
A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90° twisted cell (T-PNLC) is demonstrated. T-PNLC consists of three layers. Liquid crystal (LC) directors in the two layers near glass substrates are orthogonal to each other and those two layers modulate two eigen-po…
The magnetoelectric (ME) coupling is investigated in laminated composites employing piezoelectric ceramic PZT (PZT-8), iron-nickel-based ferromagnetic alloy with constant elasticity (FeNi-FACE), and soft magnetic amorphous ribbon FeCuNbSiB (Fe73.5Cu1Nb3Si13.5B9). The two different ferromagnetic materials of FeNi-FACE…
Dry storage casks are used to store spent nuclear fuel after removal from the reactor spent fuel pool. Even prior to the Fukushima earthquake of March 2011, dry storage of spent fuel was receiving increased attention as many reactor spent fuel pools near their capacity. Many different types of cask designs are used, a…
Wave packet dynamics is used to investigate the scattering of longitudinal (LA), transverse (TA), and bending-mode (ZA) phonons at the zigzag and armchair edges of suspended graphene. The interatomic forces are calculated using a linearized Tersoff potential. The strength of a boundary scattering event at impeding ene…
Atomistic simulations are performed to investigate the nano-scale interfacial fracture toughness between graphene and epoxy. Nano-mechanical properties of graphene and epoxy are initially studied using molecular dynamics simulations. A novel method is suggested to accurately model the behavior of the graphen/epoxy int…
Molybdenum films were observed to undergo a dramatic change in crystal texture orientation when the incident flux angle was varied in an oblique angle sputter deposition on amorphous substrates. Reflection high-energy electron diffraction pole figure and scanning electron microscopy were used to analyze in detail the…
Aurivillius phase thin films of Bi5Ti3(FexMn1−x)O15 with x = 1 (Bi5Ti3FeO15) and 0.7 (Bi5Ti3Fe0.7Mn0.3O15) on SiO2-Si(100) and Pt/Ti/SiO2-Si substrates were fabricated by chemical solution deposition. The method was optimized in order to suppress formation of pyrochlore phase Bi2Ti2O7 and improve crystallinity. The st…
Heart valve tissue engineering holds the potential to overcome limitations of currently used heart valve prostheses. It involves the isolation and expansion of autologous patient cells, the subsequent seeding of these cells onto an appropriate scaffold material, the in vitro incubation and the in vivo implantation of…
Magnetocaloric and transport properties are reported for novel poly- and nanocrystalline double composite manganites, La0.8Sr0.2MnO3/La0.7Ca0.3MnO3, prepared by the sol-gel method. Magnetic field dependence of magnetic entropy change is found to be stronger for the nano- than the polycrystalline composite. The remarka…
A numerical model for describing charge accumulation in electron-beam irradiated low density polyethylene has been put forward recently. It encompasses the generation of positive and negative charges due to impinging electrons and their transport in the insulation. However, the model was not optimized to fit all the d…
Simple bilayer approach is proposed for synthesizing hard and superhard diamond-like carbon (DLC) coatings with reduced residual stress. For this, M/DLC bilayer (M = Ti and Cu) structures are grown using hybrid system involving radio frequency (RF)-sputtering and RF-plasma enhanced chemical vapor deposition techniques…
For detoxification of Cr(VI)-contaminated water, a new process concept of using conductive polypyrrole/cellulose fiber composite (prepared by in situ polymerization of pyrrole in the presence of cellulose fibers) for water treatment was proposed and demonstrated. The effects of preparation conditions of the composite,…
Electrophoretic deposition was used to deposit thin films (∼10–200 μm) of nano-aluminum/copper oxide thermites, with a density of 29% the theoretical maximum. The reaction propagation velocity was examined using fine-patterned electrodes (0.25 × 20 mm), and the optimum velocity was found to correspond to a fuel-rich e…