Materials Literature
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We describe attempts — not always successful — made over the years to improve the efficiency of porphycene synthesis and to produce novel compounds, custom-designed for specific purposes. New porphycenes are reported, some of them obtained rather unexpectedly as by-products of the planned reactions. Structure and ener…
Yb and Er doped M2O2S (M = Y, Gd, La) phosphor was synthesized by solid state flux fusion method and their up conversion spectral properties were studied as a function different Yb concentrations. The solid state flux fusion results in well crystallized hexagonal shaped phosphor particles of average size 4–6 μm. Upcon…
Little attention has been paid in academic dishonesty literature to empirically testing the effectiveness of different instructor communication strategies to minimize cheating. Using a quasi-experimental design, we compared the effectiveness of instructor fear appeals and moral appeals on student cheating-related atti…
Abstract Alumina nanoparticles (NPs) are among the most important nanomaterials and are widely used in diverse areas. In this study, we evaluated the bioavailability and toxicity of alumina NPs in mice after oral exposure, compared with traditional alumina powder. Our results indicated that negligible alumina NPs were…
The corrosion behavior of AM50 and AZ91D Mg alloys containing 0.2 wt% to 1.0 wt% Gd was evaluated in 3.5 wt% sodium chloride (NaCl) solution using electrochemical, gravimetric, and hydrogen evolution methods. Corrosion products were examined using scanning electron microscopy and low-angle x-ray diffraction. Gd additi…
In this study, we attempted to improve the thermal rectification ratio (TRR = (JAB – JBA)/JBA) of a thermal rectifier consisting of two Al-based alloys, Al72.6Re17.4Si10 and Al71.6Mn17.4Si11, both of which are known to be the 1/1-cubic approximant of icosahedral quasicrystal. In order to estimate the thermal rectifica…
Influence of cobalt doping on the luminescence properties of ZnO nanocrystals with average diameter of 3.0 nm is investigated. Time resolved measurements at 20 K show that the dark exciton luminescence is completely lost in the nanocrystals doped with cobalt, while the perturbed luminescence with slight red shift surv…
The thermomechanical properties and shape-memory performance of a novel shape-memory hydro-epoxy resin system are studied. The system is prepared using hydro-epoxy, maleic anhydride, and poly(propylene glycol) diglycidyl ether (PPGDGE). The glass transition temperature ( T g ) is determined using dynamic mechanical an…
Charge storage capability of multilayer graphene (MLG) in floating gate flash memory structure is demonstrated. MLG sheets are considered for this purpose because of the higher work function and higher density of states compared to single layer graphene (SLG) and lower conductivity along c-axis. A memory window of 6.8…
Transparent conductive anatase TiO2−xFx(F:TiO2) epitaxial thin films were fabricated by reactive pulsed laser deposition with a solid fluorine source. F-doping as high as 1.6 × 1021 cm−3 (TiO1.95F0.05) was achieved under optimal growth conditions, and the obtained anatase TiO1.95F0.05 film had a low resistivity of 1.6…
One of the most important problems in the synthesis of carbon nanotubes is the problem of controlling their morphology, namely, length, aspect ratio, alignment and so forth. Catalytic synthesis of carbon nanotubes in a suspended bed reactor allowed for the study of the possibilities of controlling the growth of nanotu…
Using the rst-principles projector augmented wave method, the structural and electronic properties of wurtzite crystals, AlN, GaN, InN and ZnO have been calculated. Dierent exchange-correlation approximations: LDA, LDA+U , GGA, GGA+U and hybrid HeydScuseriaErnzerhof method were used. We also present the values of band…
In order to investigate the effect of both composition and the Ag-doping on the thermoelectric properties of Mg 2 Sn, samples with molar-ratio (Mg:Sn) range from 65:35 to 71:29 were synthesized using a vacuum melting process. For undoped specimens all the samples showed p -type characteristics at room temperature. As…
Carbon nanofibres (CNFs) were grown on different macrostructured supports such as cordierite monoliths, carbon felts and sintered metal fibres. The resulting composites exhibited excellent resistance to attrition/corrosion and its porosity is mainly due to mesoporous structures. The CNF/structured materials were teste…
The large temperature gradients experienced by thermoelectric modules induce significant thermal stresses which eventually lead to device failure. The impact of thermal cycling on a commercial thermoelectric module is investigated through characterization of the electrical properties. In this work, we measure the evol…
Composite materials containing multi-walled carbon nanotubes (MWNT) in polyolefine (polyethylene and polypropylene) matrix were prepared by coagulation precipitation. The morphology and structure of produced composites was investigated by scanning and transmission electron microscopy. Thermal analysis (oxidation in ai…
In this paper, a detailed investigation of the electrical performances of Phase-Change Memory test devices integrating carbon-doped Ge2Sb2Te5(named GST-C) is reported. PCM devices with 5% of carbon atomic content yields more than 50% of current reduction compared to reference GST devices, with a programming window wid…
We report on the nonlinear optical properties (absorption and refraction) of monocrystalline chemical vapor deposition diamond studied by photoluminescence and Z-scan measurements. The studied spectral interval 2.8–6.2 eV can be divided into three regions in which the one-, two- and three-photon absorption (1PA, 2PA,…
Europium L III -edge XAS spectra were recorded for silicate glasses of different compositions, quenched from melts equilibrated at different oxygen fugacity (f O₂ ). The Eu XANES spectra vary systematically with glass composition and with f O₂ (-log f O₂ ~0 to ~11.9) indicating changes in the Eu oxidation state. The i…
The flow mechanism that is realized in 3-D depending on the fabric’s porosity structure determines the fabric’s permeability performance. During the flow movement that happens both in the in-plane and through-plane directions, not only the inter-yarn pore properties but inter-fiber pore properties play a significant r…