Materials Literature
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In the present paper, the possibility of using thermoelectric power generator modules (TEGs) to convert the heat generated by the photovoltaic/thermal (PVT) collector into electricity is investigated. A comprehensive heat transfer model for the combined PVT-TEG system is developed via MATLAB and simulated under differ…
Undoped, Cu-doped, Se-enriched, and Cu2Se-doped ZnSe films have been grown on fused quartz substrates by pulsed laser deposition. While the other films are highly resistive, Cu2Se-doped ZnSe films are p-type conducting with hole concentrations of ∼1.1 × 1019 cm−3 and resistivities of ∼0.098 Ω cm (compared with previou…
We demonstrate sub-wavelength grating couplers patterned on glass surfaces which are designed to convert incident free-space radiation into guided modes along the glass material. The devices are fabricated by nanoimprint lithography and the measured optical performance is compared to a simple model based on diffractio…
We propose a study of a generalized Airy-like formula of the transmittance through planar resonators. A complete and analytical analysis of total transmission conditions is given according to physical parameters. The homogeneous problem related to free oscillations of resonators, which leads to complex resonance frequ…
Abstract Synthesis and rheological properties of a series of polypyrrole (PPy) nanodispersions stabilized by sodium dodecyl sulfate (SDS) are described here. Changes in particle size, morphology, spectroscopy (UV–vis), and rheological properties (steady and dynamic) of the dispersions with variation in PPy fraction we…
The advantages of tellurium-nitrogen (Te-N) codoping are investigated in ZnO films grown by metal-organic chemical vapor deposition. Te incorporation gives aid in enhancing the N solubility by lowering its formation energy while N addition helps to stabilize the substituted Te on O sites with the phase-segregated ZnTe…
In an effort to combine group III-V semiconductors with carbon nanotubes, a simple solution-based technique for gallium functionalization of nitrogen-doped multi-wall carbon nanotubes has been developed. With an aqueous solution of a gallium salt (GaI(3)), it was possible to form covalent bonds between the Ga(3+) ion…
The surface of SrTiO(3)(110) single crystal is prepared in monophase with different reconstructions. The increase of surface Ti concentration is responsible for the evolution of the reconstruction from (4×1) to (2×8), and to a new (1×10) structure. It also induces the enhancement of the surface metallicity, characteri…
Interactions between ethanol-water mixtures and a hydrophobic hydrogen terminated nanocrystalline diamond surface, are investigated by sessile drop contact angle measurements. The surface free energy of the hydrophobic surface, obtained with pure liquids, differs strongly from values obtained by ethanol-water mixtures…
A new method to characterize the long-time linear relaxation mechanisms of immiscible blends based on creep experiment was developed. Small-amplitude oscillatory shear and incomplete creep/recovery experiments were combined to characterize immiscible blends of polypropylene with dispersed droplets of polystyrene. An e…
: This work presents results of measurements of viscosity of suspensions including yttrium oxide (Y2O3), yttrium aluminum garnet (Y3Al5O12) and magnesium aluminum spinel (MgAl2O4) nanopowders in ethanol. Nanoparticles used in our research were either commercially available (Baikowski) or nanopowders newly developed in…
We demonstrate a type of meta-atom for creating metamaterials with giant nonlinear optical activity but vanishing linear optical activity in a wide frequency range. Such properties are not found in any natural materials, and we call this regime as pure nonlinear optical activity. We further extend our design concept a…
A new terthiophene monomer: 3',4'-dimethoxy-2,2':5',2"-terthiophene (TMT) was synthesized and characterized by ¹H-NMR, ¹³C-NMR and FTIR. The solid-state oxidative polymerizations of TMT were performed in various ratios of oxidant (FeCl₃) to monomer (TMT). The resulting polymers were characterized by ¹H-NMR, FTIR, UV-v…
Density functional theory calculations have been performed on a range of magnesium and magnesium hydride nanoclusters to examine the 1 bar desorption temperatures. The vibrational entropies and enthalpies are calculated for each cluster, within the harmonic approximation, which permits calculation of the desorption Gi…
Greigite (Fe${}_{3}$S${}_{4}$) and magnetite (Fe${}_{3}$O${}_{4}$) are isostructural and isoelectronic ferrimagnets with quite distinct properties. Electronic structure calculations reveal greigite is a normal metal in contrast to half-metallic magnetite. Greigite shows a complex Fermi surface with a unique influence…
We analyze the structural formation of a polymer chain inside of an attractive sphere depending on the attraction strength. Our model is composed of a coarse-grained polymer and an attractive sphere potential. Within this frame, multicanonical Monte Carlo simulations are employed to identify the global minimum energie…
Field-cooled magnetization of Nd0.5Sr0.5CoO3 shows an anomalous maximum at T* = 76 K ≪ TC = 228 K, where TC is the ferromagnetic Curie temperature of the Co-sublattice. While T* shows a systematic shift with increasing magnetic field(H), the maximum does not disappear even at H = 7 T. We suggest that Nd(4f) moment is…
A nonspherical glass particle relaxes to its equilibrium shape by viscous flow driven by capillarity at elevated temperatures. The virial method is applied to Stokes equation for studying the viscous sintering of an ellipsoidal particle. The spheroidization, or the retraction of the particle, is a result of anisotropi…
We present a three-dimensional acoustic concentrator capable of significantly enhancing the sound intensity in the compressive region with scattering cancellation, imaging, and mirage effects. The concentrator shell is built by isotropic gradient negative-index materials, which together with an exterior host medium sl…
We demonstrated that MnFe 2 O 4 spheres could be successfully prepared in large‐scale via a facile solvothermal process. The average size of final products over a wide range from 40 to 420 nm was remarkably influenced by the experimental parameters, such as reaction duration, surfactants, and initial concentration of…