Materials Literature
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A transmission electron microscopy (TEM) study of the complex NaNb(1-x)Ta(x)O(3) (0.4 < or = x < or = 0.6) perovskites, combining high-resolution TEM and high-angle annular dark-field scanning TEM, has revealed the formation of extended areas on the crystals where niobium and tantalum order into layers in a 1:1 ratio.…
The mechanism of room temperature (RT) ferromagnetism for low doping concentration of 2.5% V in ZnO have been systematically discussed by measuring structural, electrical, and magnetic properties. The evolution of the Curie temperature from above RT in insulated V:ZnO powders to 270 K in semiconducting samples was obs…
In order to investigate the change in the electronic structure with Mn doping of ${\text{SrRu}}_{1\ensuremath{-}x}{\text{Mn}}_{x}{\text{O}}_{3}$ (SRMO), we have performed soft x-ray synchrotron photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). In the soft x-ray PES spectra, the sharp peak struc…
Like martensitic transformations (MTs), inverse martensitic transformations (IMTs) are shear-dominant diffusionless transformations, but are driven by reduction in interfacial energies rather than bulk free energies, and exhibit distinctive behavior such as instantaneous initiation (like spinodal decomposition) and se…
[FR]: Le but de ce travail est de préparer des silices mésoporeuses ayant une porosité développée par la méthode sol-gel. L’effet de certains paramètres de synthèse tels que la nature du catalyseur, le solvant, le rapport molaire catalyseur/silicium, l’emploi de surfactant et la température a été étudié. L’utilisation…
Composites with polypropylene (PP) and 2 wt% NaOH treated jute fibers were prepared by the injection molding technique. In order to improve the affinity and adhesion between the reinforced jute fiber and the polymer matrix (polypropylene) during manufacturing, maleic anhydride grafted polypropylene (MAPP) as a couplin…
Abstract In this study the effect of electron beam irradiation on rheological properties of a poly (propylene‐co‐ethylene) heterophasic copolymer is evaluated. Using dynamic viscoelastic measurement in the linear viscoelastic range of deformation, it is observed that the complex viscosity and dynamic modulus of polypr…
Here, we report a performance analysis on carbon nanotube (CNT) Schottky diodes using source-drain current anisotropy. An analytical model is derived based on thermionic field emission and used to correlate experimental data from Pd–Hf, Ti–Hf, Cr–Hf, Ti–Cr, and Pd–Au mixed metal devices fabricated on one single 6 mm l…
Synthesis controlled by an external magnetic field is a popular and effective method in the preparation of magnetic materials. To know the influence of the distribution of magnetic lines of force on the growth of magnetic materials allows a deep understanding of the mechanism of crystal growth controlled by an externa…
In this work, the authors design, fabricate, and evaluate three prototype ceramic microchannel reactor architectures with two-dimensional complex flow configurations for coupling methanol steam reforming with methanol combustion/partial oxidation. These prototypes were evaluated for the autothermal hydrogen production…
The use of gold nanoparticles (GNPs) in bioassays is often hampered by their colloidal stability. In this study, gold nanoparticles coated with different mercapto alkanes were investigated towards their stability. Hereto, the effects of the alkane chain length (5-11 methylene groups), the type of functional end-group…
Porous thin films with ordered nanopores have been processed by thermal treatment on vertically aligned nanocomposites (VAN), e.g., (BiFeO(3))(0.5):(Sm(2)O(3))(0.5) VAN thin films. Uniformly distributed nanopores with an average diameter of 60 nm and 150 nm were formed at the bottom and top of the nanoporous films, re…
Conformations of β-carotene molecules encapsulated in single walled carbon nanotubes (Car@SWNT) are modeled and evaluated based on experimental Raman spectra from the literature, most notably the emergence of a new band. A combination of molecular mechanics and density functional theory calculations is used in order t…
The controlled fabrication of Si nanocrystals embedded in thin silicon oxynitride films (<15 nm) on top of a silicon substrate has been realized by PPECVD with N(2)O-SiH(4) precursors. The effect of inert and oxidizing annealing processes on the Si nanocrystal spatial and size distributions is studied by coupling elli…
By using La0.7Sr0.3MnO3 (L) and SrRuO3 (S) electrodes, epitaxial Pb(Zr0.52Ti0.48)O3 (PZT) capacitors with different electrode configurations, i.e., L/PZT/L (from top to bottom) (a), S/PZT/S (b), S/PZT/L (c), and L/PZT/S (d), have been fabricated and the process-induced imprint was investigated. All as-grown capacitors…
Electrochemical properties of core-shell CdSe/ZnS quantum dots (QDs) in a non-aqueous solution are presented. Cathodic reduction and anodic oxidation processes involving the QD HOMO and LUMO levels as well as defect states were identified by cyclic voltammetry. The electrochemical bandgap was estimated from the anodic…
We report thermodynamic and crystallographic properties for $\text{Ca}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{P}}_{2}$ and $\text{Ca}{({\text{Ni}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{P}}_{2}$ for $0\ensuremath{\le}x\ensuremath{\le}1$ both ${\text{ThCr}}_{2}{\text{Si}}_{2}$-type solid solu…
Anelastic loss mechanisms associated with phase transitions in SrZr(1-x)Ti(x)O(3) perovskites (x = 0.375, 0.450, 0.550, 0.775) have been investigated by dynamic mechanical analysis between 128 and 723 K at frequencies of 0.1-50 Hz. Distinctive patterns of changes in the elastic moduli due to octahedral tilting transit…
We describe here the biodegradable polymers consisted of the tandemly linked phosphate-caged fluorescein in the main chains. The caged-fluorescein monomer with the phosphoramidite groups at both hydroxyl groups was synthesized, and the polycondensations were executed in the presence of the diol derivatives which were…
Aharonov-Bohm (AB) effects in mesoscopic metal rings have been extensively studied. In this paper, we investigate these effects on the persistent currents (PCs) in a closed graphene ring with broken time-reversal symmetry. A hard boundary condition is introduced to describe the Dirac electrons moving along such a ring…