Materials Literature
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In this study, the use of broadside-coupled SRR (BC-SRR) metamaterial topology is suggested for pressure, temperature, humidity and concentration sensor applications. Also, the use of V-shaped resonator topology is suggested for pressure sensor application. The feasibility of such sensors are demonstrated by numerical…
The epitaxial growth of graphene on inexpensive, commercially available, free-standing polycrystalline 3 C-SiC has been achieved by solid state graphitization in ultrahigh vacuum. The structural and electronic properties of such epitaxial graphene (EG) have been explored by Raman spectroscopy, scanning tunneling micro…
Abstract Poly(ester imide)s (PEsIs) were prepared from fluorene (FL)‐containing ester‐linked tetracarboxylic dianhydrides and various diamines. The PEsI films achieved excellent combined properties: very high T g 's exceeding 300 °C in some cases, relatively low water absorption, good thermoplasticity, and excellent s…
We have investigated the electrical properties of Ge1Sb2Te4 and Ge2Sb2Te5 thin films in the temperature range of 27 to 200 °C. The optical bandgap values obtained from the measured absorption spectra for amorphous Ge1Sb2Te4 and Ge2Sb2Te5 are 0.70 and 0.90 eV, respectively. The results of the in situ temperature depend…
Abstract Carbon nanoporous films (Pd‐C films) containing Pd nanograins for hydrogen storage devices and hydrogen sensor application were prepared by two steps PVD/CVD method. Development of a carbon surface and size of Pd nanocrystals were studied for these films. The structure, topography and morphology of Pd‐C films…
Dynamic kinetic data collected over commercial V<sub>2<sub/>O<sub>5<sub/>-WO<sub>3<sub/>/TiO<sub>2<sub/> and Fe-zeolite catalysts analyzing the standard NH<sub>3<sub/>-SCR of NO for the abatement of NO<sub>x<sub/> from vehicle exhausts showed transient effects at low temperatures related to the inhibiting action of ex…
Different molecular beam epitaxy (MBE) strategies for fabricating SrTiO3(STO) thin films on Si (001) substrates are described and compared. The resulting STO structural quality (crystallinity, surface roughness, and interface sharpness) is systematically analyzed depending on growth conditions. In particular, the auth…
Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.
We have successfully synthesized single-crystal samples of fast Li-ion conducting cubic Li 7 La 3 Zr 2 O 12 with the garnet related-type structure by a self-flux method using LiNO 3 at 1150°C. The as-grown Li 7 La 3 Zr 2 O 12 crystals are colorless and transparent; they also have a polyhedral-shape with a maximum dime…
Eichhornia crassipes (Water hyacinth) is a hydrophyte which invaded all Egyptian water bodies causing serious problems of navigation and water quality deterioration. Known weight of the sample was successively extracted with hexane (E1), ethyl acetate (E2) and methanol (E3). Antioxidant activity of extracts was perfor…
New heterogeneous photosensitizers were synthesized, in which phthalocyanines of zinc and aluminum, tetrasubstituted at non-peripheral positions with modified thiophenyl groups, were grafted to aminopropyl silica gel. The absorption and fluorescence spectra, and the quantum yields of fluorescence and photosensitized s…
Nanocrystalline vanadium dioxide (VO2) film on c-plane sapphire substrate has been prepared by direct-current magnetron sputter deposition. The electronic band structures of the VO2 film with monoclinic phase have been investigated by ultraviolet-infrared transmittance spectra in the temperature range of 5.3–300 K. It…
1ω and 3ω methods are widely established transient measurement techniques for the characterization of thermal transport in bulk-materials, thin films, and 1D nano-objects. These methods are based on resistance oscillations of a heater caused by Joule-heating from a sinusoidal current at frequency 1ω which lead to chan…
'Fragments' refer to particularly small molecular starting points in medicinal chemistry. The small size of fragments requires adapted techniques for their screening and subsequent elaboration. The detection of the weak binding affinity of fragments for their target, and associated screening issues, have been debated…
This paper deals with the investigation of structural effects on Stokes and anti-Stokes luminescence properties of double-perovskite (Ba,Sr)2CaMoO6: Eu3+,Yb3+. It is found that the tilting of the (Ca/Mo)O6 octahedra framework favors energy transfer from the MoO6 group to Eu3+/Yb3+ at the B site for Stokes luminescence…
Epitaxial graphene can be formed on silicon substrates by annealing a 3C-SiC film formed on a silicon substrate in ultrahigh vacuum (G/3C-SiC/Si). In this work, we explore the graphitization process on the 3C-SiC(111)/Si(111) surface by using low-energy electron diffraction and X-ray photoelectron spectroscopy (XPS) a…
With increasing thermal fluxes, the performance of thermal interface materials (TIMs) that are used to reduce the thermal resistance between contacting surfaces in electronic devices, such as at the die-to-heat sink or heat spreader-to-heat sink interfaces, is becoming critical. However, measuring the thermal resistan…
This study concerns the encapsulation and controlled release of both hydrophobic and hydrophilic medications with one polymer, which are delivered together as a combined therapy to treat diseased tissue. To test our hypothesis that the novel PEG-graft-PLA (PEG, polyethylene glycol; PLA, polylactic acid) can deliver bo…
The main goal of the carried out investigations was to examine behaviour of hydrogen isotopes (and evaluation of interaction parameters such as coefficients of diffusion, permeation and solubility) in materials of first wall and divertor of fusion facility in conditions approximate to its real working i.e. under simul…
The purpose of this paper was to analyze structural and optical properties of gadolinia-doped ceria (GDC, Ce0.9Gd0.1O1.95) thin films. At first the ceria-gadolinia multilayer sandwich systems (4-12 layers) were deposited using reactive magnetron sputtering in the O2/Ar gas mixtures. The films were formed with 90% ceri…