Materials Literature
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A dual-polarized frequency-tunable composite left-handed slab (CLS) is proposed. The CLS consists of periodic split-ring resonators (SRRs) along with thin wires. Two orthogonal SRR/wire arrays are utilized for dual-polarization purposes. Polarization-selectivity and frequency-tuning are achieved by means of on/off swi…
Selective chlorination of thiophene-2,3-dithiol with SO(2)Cl(2) generates the corresponding sulfenyl chloride, 2,3-C(4)H(2)S(SCl)(2). Subsequent condensation with Me(3)SiN(3) yields the thiophenodithiazolylium salt [C(4)H(2)S(3)N]Cl, [TDTA]Cl. The structure of the cation, TDTA+, was established by X-ray diffraction as…
We researched the possibilities for engineering the morphology of porous structures in n-InP. Lithographic patterning of the sample surface before anodic etching was shown to modify considerably the electric field distribution which, in its turn, defined the direction of pore growth inside the specimen. We show that l…
Delafossite-type CuYO 2 and CuY 1- x Ca x O 2 ( x ≤0.05) samples exhibited a green-PL-emission band due to the Cu + interconfiguration transition from 3d 9 4s 1 to 3d 10 at room temperature. With increasing Ca concentration, the Cu + emission shifted slightly to the shorter-wavelength side with a slightly weaker emiss…
Some of the applications of the electrochemical noise (ECN) technique in corrosion research as well as some of the promises and realities concerning the use of electrochemical noise analysis (ENA) are discussed. Perceived advantages of ENA include the ease of data collection and analysis. It is often assumed that the…
Catalytic elimination of formaldehyde (HCHO) was investigated over Cu-Al2O3 catalyst at room temperature. The results indicated that no oxidation of HCHO into CO2 occurs at room temperature, but the adsorption of HCHO occurs on the catalyst surface. With the increase of gas hourly space velocity (GHSV) and inlet HCHO…
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NMR studies have revealed the fundamental structure of natural rubber (NR) composed of the initiating terminal (ω-terminal), two trans-1,4 isoprene units, a long sequence of cis-1,4 isoprene units and the chain-end group (a-terminal). The functional ω- and α-terminal groups have been postulated to form branch-points b…
According to the measurement and data processing of partial discharges due to discrete water droplets on the surface of silicone rubber, phase characteristic of partial discharge for water droplets is obtained. And the change of silicone rubber surface structure by the Fourier Transform Infrared Spectroscopy (FTIR) is…
The optical properties of spherical gold nanoparticles are calculated using classical electrodynamics. The wavelength corresponding to maximum extinction shifts to longer wavelengths as the size of the nanoparticle is increased. The influence of higher-order multipoles is evident for large nanoparticles, making the sp…
Photoluminescence spectra and photoluminescence excitation spectra have been measured on samples of hexagonal boron nitride microcrystalline powder, cubic boron nitride single crystal, and boron nitride nanotubes (mixture of single-walled and multi-walled with some h-BN precursor). The reason for studying these 3 samp…
The luminescence of ScLu3+ and ScAl3+ centres created by scandium ions in octahedral and dodecahedral sites of garnet lattice, and the features of the energy transfer to them by excitons have been analysed in Lu3Al5O12:Sc single crystalline films by means of investigation of time-resolved emission and decay kinetic sp…
In this paper, we present our work on carbon nanotubes, including our most recent results, in two important fields: production of carbon nanotubes itself and fabrication of carbon nanotube based composites with enhanced functionality. Firstly, we focus on the three main carbon nanotube production techniques, namely el…
With recent advancements in thermoelectric material performance, thermoelectric generators have become a viable alternative for power generation using small temperature differentials with benefits that can not be found in other energy conversion methods. The power generated by a thermoelectric generator, using a small…
The subsolidus phase diagram of the system Bi2O3–ZnO–Nb2O5 in the region of the cubic pyrochlore phase has been determined at 950 °C. This phase forms a solid solution area that does not include the so-called ideal composition P, Bi3Zn2Nb3O14. It may be described in terms of two compositional variables: ZnO deficiency…
Synthesis of novel mesoporous hybrid tin oxophosphate is reported from phenylphosphonic acid as the only precursor of phosphorus in the presence of anionic surfactant (SDS), which possesses a wormhole mesoporous structure and is stable even after calcination at 550 degrees C.
: A liquid crystalline epoxy polymer based on an epoxy monomer with biphenyl type mesogenic compound was synthesized and characterized using differential scanning calorimetry, optical microscopy, and X-ray diffraction. The monomer without liquid crystalline properties was transformed into a liquid crystalline state by…
\n\t\t\t\t\tPAN nanofibres were prepared via an electrospinning process. The effect of polymer concentration on the fibre morphology was studied. At a very dilute solution, no fibres were obtained in the electrospinning process. As the concentration increased, the fibre morphology evolved from a beads-on-string struct…
Polyethylene films, prepared from a range of mLLDPE, LLDPE, and ULDPE resins containing 4% polyisobutylene (PIB) from a masterbatch, are manufactured using a Killion cast film extrusion system. FTIR, DSC, and mechanical analysis techniques are used to investigate the effect of comonomer type, density, and melt flow in…
Amorphous germanium (a-Ge) structure is known to show a complex behavior upon pressurization. Here an XAS experiment on a-Ge at high pressure and temperature is presented, which is aimed to investigate such behavior and verify the presence of polyamorphism. High quality a-Ge EXAFS spectra (Ge K-edge) have been collect…