Materials Literature
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In this paper we now report our ongoing progress in the preparation of artificial photosynthetic systems through the preparation of light harvesting multi-porphyrins. A tetramer, constituted of a central dipeptide functionalized by two free-base porphyrins and surrounded by one amino-acid bearing a pendant Zn ( II ) p…
ABSTRACT External surfaces of pipelines are protected from corrosion by polymeric coatings that have evolved in the industry over the past 60 years, beginning with asphalt and then coal tar coatings, followed by polyethylene, epoxy, and urethane coatings. When a coating degrades or fails, the type of coating has an ef…
The structural and physical properties of the recently discovered electronic ferroelectric materials LuFe(2)O(4) and Lu(2)Fe(3)O(7) have been investigated for Mg substitution of Fe. X-ray diffraction data demonstrate that the lattice parameters in both systems change progressively with increasing Mg content, with a sm…
Thiophene has been electrochemically polymerized using organic and inorganic oxidizing agents, 4-toluene sulphonic acid silver salt and perchloric acid, in the absence and presence of ZnSO 4 . EIcctropolymerized aggregates have been characterized by morphological studies, growth kinetics, powder X-ray diffraction, dif…
Partial discharge (PD) characteristics in air, argon and helium at pressures between 101 kPa (760 Torr) to about 0.27 kPa (2 Torr) under 60 Hz ac energization were studied with various electrode arrangements. Measurements are presented for two representative electrode configurations, (1) needle-plane, with 20 mm spaci…
We propose an analytical device model for a graphene nanoribbon field-effect transistor (GNR-FET) under the dc and ac operating conditions. The GNR-FET under consideration is based on a heterostructure, which consists of an array of nanoribbons clad between the highly conducting substrate (the back gate) and the top g…
Carbon nanotube field effect transistor (FET) type biosensors have been widely investigated as one of the promising platforms for highly sensitive personalized disease-monitoring electronic devices. Combined with high level cutting edge information technology (IT) infra systems, carbon nanotube transistor biosensors a…
In this presented work, α-Al2O3 is prepared from γ-Al2O3 by mechanical milling technique. Also the results obtained in studying the phase transformation of γ-Al2O3 into α-Al2O3 during intense mechanical activation by high-energy ball milling are presented. The powder samples were characterised by the commonly used bul…
An artificial nanocomposite medium made by embedding copper nanoparticles covered by copper oxide in a high-pressure polyethylene matrix is studied. Pioneering experiments are reported aimed at finding the temperature dependences of its insulating properties, dielectric relaxation time, and activation energy for polar…
The interaction between solid copper and liquid gallium is considered, which is the main process during the setting of diffusion-solidifying solders. The dependences of the process rate and the size characteristics on the phase composition of the initial mixture are found. The intermetallic compound CuGa 2 is shown to…
The spectral and luminescent manifestations of the electrostatic formation of quantum dot (QD)-porphyrin complexes are studied. The QD luminescence in these complexes is found to be efficiently quenched. The luminescence of molecules complexed with QDs is also partially quenched. The luminescence excitation spectra of…
The susceptibility to stress corrosion cracking (SCC) of the weld zone of carbon steel overpack, a candidate container for geological disposal of high-level radioactive waste, was studied using the slow strain rate testing (SSRT) technique. Several welding processes were applied to low-carbon steel, and SCC susceptibi…
Abstract Carbonaceous materials are highly important electrode materials due to their wide electrochemical window, inertness with a wide spectrum of electroactive materials, and the possibility to develop highly porous but yet conductive activated carbons. Carbon cloth electrodes could be prepared from simple polymeri…
Abstract Commercial fibers covered with poly(dimethylsiloxane) were used to pre-concentrate (solid phase microextraction technique) products evolved from the thermal degradation of isotactic polypropylene. Although the analysis by GC-MS indicated the formation of more than one hundred evolved products (ca. forty were…
We demonstrated a Cu/CNT composite material for interconnect application. The electromigration (EM) properties of Cu/CNT composite via and line were investigated using Kelvin and Blech test structures respectively. Our results showed that the EM lifetime of the Cu/CNT composite is more than 5 times longer than Cu.
A model is discussed for magnetoelectric interactions under ferromagnetic resonance (FMR) in bilayers of a ferrite and a functionally graded piezoelectric. A linear variation in the in-plane piezoelectric coefficient is assumed. A dc electric field E applied perpendicular to the sample plane will then result in a vary…
A high birefringence (Δn = 0.292 at λ = 633 nm, 25°C) and low crossover frequency (<1 kHz at T = 25°C) dual‐frequency liquid crystal (DFLC) mixture was developed. The high birefringence enabled us to use a thin liquid crystal cell, which is helpful for fast response time and low operating voltage. The initially low cr…
Our previous studies on high energy (60 keV) electron bombardment of thin films of pGEM-3Zf(-) plasmid DNA with and without bound gold nanoparticles (GNP) showed that the presence of these particles greatly increases the formation of single-(SSB) and double-strand (DSB) breaks. To study the basic mechanisms underlying…
Abstract The present research aimed to characterize the microstructure of icosahedral quasicrystalline phase ( i -phase) in different chemical compositions of Al–Cu–Fe alloys. The ternary alloys with the nominal compositions of Al 70 Cu 20 Fe 10 , Al 65 Cu 20 Fe 15 and Al 63 Cu 25 Fe 12 (at%) were rapidly solidified b…
This study describes the optical and ac electrical characterization of polymethyl methacrylate (PMMA)/indium tin oxide (ITO) nanocomposites containing a Voronoi-type segregated network microstructure. Optical transmission microscopy, scanning electron microscopy (SEM), and impedance spectroscopy were used to investiga…