Materials Literature
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We consider the numerical scattering of plane waves by a metallic diffraction grating with a single defect. Besides different diffracted orders, a perturbed scattered field with arbitrary reflection direction is generated by the defect. We transform the diffraction grating into a closed waveguide by introducing a perf…
A macroscopic model of the solidification process in a rotary electromagnetic stirrer is presented. The fluid flow, heat, and mass transfer inside a rotary stirrer are modeled using, 3-D swirl flow equations in which turbulent flow is simulated using a k − ϵ model. A hybrid model is used to represent the mushy zone, w…
Palladium oxide (PdO) was deposited on platinum by reactive sputter deposition, and the PdO thin film grown on the Pt substrate had a flakelike morphology. The nanosized flake had a core–shell structure with a single Pd grain encapsulated by a crystalline PdO surface layer. The formation of the PdO capped nanoflakes w…
We present transport measurements on a tunable three-layer graphene single electron transistor (SET). The device consists of an etched three-layer graphene flake with two narrow constrictions separating the island from source and drain contacts. Three lateral graphene gates are used to electrostatically tune the devic…
We have synthesized a novel mesogenic azobenzene molecule and studied its monolayer film properties at air-water interface (Langmuir film) and air-solid interface (Langmuir-Blodgett film). The material, H-shaped dimer bis[5-(4'-n-dodecyloxy benzoyloxy)-2-(4''-methylphenylazo)phenyl] adipate (12D1H) exhibits a smectic…
The corrosion protection of 2024 T3 aluminum alloy by 1,2,3 benzotriazole (BTAH) was investigated in sulfate-containing chloride solutions with electrochemical noise measurements and scanning electron microscopy (SEM) observations. At high concentrations of chloride ions, BTAH prevents uniform corrosion of Al 2024 by…
Nanocyrstalline phosphors were prepared through a Pechini-type sol-gel process. X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence, and cathodoluminescence (CL) spectra were utilized to characterize the synthesized phosphors. XRD results reveal that the sample begins to cr…
Ein abgestuftes Quantentunneln der Magnetisierung (QTM) wurde zum ersten Mal in der Hystereseschleife des gemischten 3d-4f-Einzelmolekülmagneten (SMM) {Mn12Gd} beobachtet. Das Phänomen lässt sich mit einer ungewöhnlich großen Austauschkopplung des 4f-Atoms mit der {Mn12}-Schale erklären. Dieses verbesserte Quantenverh…
Colloid-polymer mixtures are frequently viewed as an effective one-component fluid (the colloid) with polymer-mediated depletion interactions. This view, together with conventional mode coupling theory, constitutes the current description of the reentrant glass transition experimentally observed in these systems. A mo…
The wetting property of nanoimprinted sol–gel-derived ZnO coating has been studied. The deposited ZnO gel film exhibits hydrophilicity owing to the adsorption of OH groups on the surface. The regular micro/nanopattern fabricated by nanoimprinting will prevent water from completely contacting the solid surface by trapp…
Ferromagnetic and conductive Fe-doped ZnO films were deposited on glass substrates by magnetron radio frequency sputtering. The crystalline structure and electrical characteristics were investigated to achieve optimum growth conditions. The films are grown with the orientations ⟨001⟩ perpendicular to the film plane an…
Using first-principles data for the elastic properties of PbTe, ${\text{AgSbTe}}_{2}$, and related compounds, we extend our previous theoretical study of the thermodynamics of ${\text{PbTe-AgSbTe}}_{2}$ and present an in-depth analysis of the effects of elastic strain on the thermodynamics of ordering and coherent sol…
Abstract Ionic liquids (IL)s have been generating increasing attention over the last decade. ILs were originally introduced as alternative green reaction media owing to their distinctive chemical and physical properties of nonvolatility, nonflammability, thermal stability, and controlled miscibility. In this investiga…
In this paper, we report on the observation of stimulated Raman scattering in amorphous silicon nanocrystals embedded in Si-rich nitride/silicon superlattice structures (SRN/Si-SLs). In particular, we have experimentally demonstrated amplification of Stokes signal up to 0.9dB∕cm at 1540.6nm using a 1427nm continuous-w…
The biocompatibility of iron-polysaccharide complexes has been well-documented. Herein, a stable thrombo-resistant coating was fabricated by consecutive adsorption of Fe (III) and polysaccharides including heparin (Hep) and dextran sulfate (DS) onto various surface by layer-by-layer self-assembly technique via both el…
Nano-scale defect clusters, such as voids, dislocation loops, stacking-fault tetrahedra and irradiation-induced precipitates, are produced in metals by irradiation with high-energy atomic particles. They are obstacles to dislocation glide and can give rise to substantial changes in the yield and flow stresses and duct…
We present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect [also known as anti-Stokes photoluminescence (ASPL)] observed in ensembles of colloidal semiconductor nanocrystal quantum dots (QDs). The proposed A…
A new co-crystal (phase H ) of 5-methyl-2-pyridone ( 5MP ) and trimesic acid ( TMA ) has been prepared by grinding a methanol solvate co-crystal (phase M ) of 5MP and TMA under ambient conditions. Powder X-ray diffraction indicates that the new co-crystal phase H is structurally different from the methanol solvate co-…
This study investigated the adhesion (pull-off) force and contact angles of a water strider's leg. During hydrostatic experiments, the adhesion force was found to be 2 dyn. The image of a cross section of a live leg contacted with a deformed water surface provided the contact angle of 168.8 degrees . A numerical schem…
Glycerol metabolism provides a central link between sugar and fatty acid catabolism. In most bacteria, glycerol kinase plays a crucial role in regulating channel/facilitator-dependent uptake of glycerol into the cell. In the firmicute Enterococcus casseliflavus, this enzyme's activity is enhanced by phosphorylation of…