Materials Literature
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Temperature dependent electromechanical investigations of 〈110〉, 〈001〉, and 〈111〉 oriented morphotropic phase boundary compositions of Pb(Mg1/3Nb2/3)O3-PbTi03 crystals have been performed. Softening of the dielectric constant, piezoelectric constant, and Young’s modulus was found for all three orientations, near a fer…
The morphology of the porous network in porous SiC has been studied. It has been found that pore formation starts with a few pores on the surface and then the porous network grows in a V-shaped branched structure below the surface. The hydrogen etching rates of porous and nonporous SiC have been measured. Etch rates o…
Sensitized photoreduction of Ag+ ions and subsequent formation of colloidal Ag nanoparticles take place when an aqueous solution of a mixture of AgClO4, sodium dodecylsulfate (SDS) and benzophenone (BP) is irradiated with near-UV light. In this study, the mechanism and kinetics of the reaction have been studied by mea…
Abstract A remelting–restabilization technique was applied to evaluate the closed‐loop recycling of postused, white pigmented, garden chairs made from CaCO 3 ‐filled polypropylene (PP). Analysis of the randomly collected postused chairs showed only an insufficient quantity of residual active stabilizers. Different sta…
The contrast-matching SANS technique has been utilised to determine inter-pillar distances (and surface texture) in montmorillonite and beidellite pillared smectite clays; they lie in the range 1.40-1.80 nm, reflecting different inter-pillar orderings.
Silver-doped SrBi2Ta2O9 (Ag:SBT) ceramics were synthesized by solid state reactions. The reaction mechanism has been deduced based on the crystal defect chemistry. It involves the diffusion of Ag+ and O2− ions into the (Bi2O2)2+ layers between the perovskite-like units to recover the bismuth and oxygen vacancies, resp…
Abstract Copolymer nanofibrils composed of pyrrole and thiophene were prepared by synthesizing the desired polymer within the pores of microporous anodic aluminum oxide (AAO) template membranes. The copolymer nanofibrils were photographed using scanning electron microscopy (SEM) and transmission electron microscopy (T…
Abstract The comparison of the mechanical properties between poly(propylene)/ethylene‐propylene‐diene monomer elastomer (PP/EPDM) and poly(propylene)/maleic anhydride‐ g ‐ethylene‐propylene‐diene monomer [PP/MEPDM (MAH‐ g ‐EPDM)] showed that the latter blend has noticeably higher Izod impact strength but lower Young's…
We suggest a new approach to theory of contact thermoelectric cooling (Peltier effect). The metal–metal, metal–n-type semiconductor, metal–p-type semiconductor, p–n junction contacts are analyzed. Both degenerate and nondegenerate electron and hole gases are considered. The role of recombination in the contact cooling…
We describe a method to produce high-crystalline quality multiwalled carbon nanotubes from carbon black. By modifying the arc into a high-temperature oven, carbon black is converted into carbon nanotubes by a solid-state transformation without a catalyst. This process sheds new light onto the growth mechanism of carbo…
Electron spin echo envelope modulation (ESEEM) experiments with aqueous complexes of Gd3+ and Mn2+ have shown that a common and unusual feature of the primary ESEEM spectra of such high spin/weak crystal field systems is an extremely low intensity of the sum combination line. Numerical simulations of the ESEEM spectra…
Successful integration of Ba1−xSrxTiO3 (BST) based thin films with affordable Si substrates has a potential significant commercial impact as the demand for high-frequency tunable devices intensifies. This work evaluates the material properties of postdeposition annealed Ta2O5 thin films fabricated via the metalorganic…
Dielectric measurements (10−2–109 Hz) on plastically crystalline cyanocyclohexane reveal a glass transition where the rotational dynamics freezes at a vitrification temperature Tg=134 K. A full line-shape analysis of the dielectric loss spectra, which include a pronounced secondary relaxation contribution (β process)…
We have investigated high-excitation photoluminescence properties of CuI thin films with a thickness of 100 nm grown on a NaCl substrate by vacuum deposition. The energies of the heavy-hole and light-hole excitons in the CuI thin film are split at low temperatures by the thermal strain resulting from the difference in…
The dielectric and electrically induced strain characteristics of Fe-substituted Pb(Zn1/3Nb2/3)O3–PbTiO3 single crystals have been investigated. These investigations have shown that Fe substitution results in: (i) a lowering of the field level required to obtain large strains, (ii) an increased squareness in the ε−E r…
In order to study the effects of penetrability in mixtures of dissimilar particles we consider hard (colloidal) spheres and penetrable spheres. The latter may be taken to represent ideal, noninteracting polymer coils. Polymers and colloids interact by means of a repulsive step-function pair potential, which allows for…
Polycyclic aromatic hydrocarbons (PAHs) have been employed as models to investigate the functionalization of SWNTs sidewalls with transition metal complexes at the NL-DFT level, pointing out the most favorable coordination sites and the electronic properties of the resulting system. Molecular fragments topologically r…
A principle of planar-type visible light emission is presented using ballistic electrons as excitation source. The device is composed of a semitransparent top electrode, a thin film of fluorescent material, a nanocrystalline porous silicon (nc-PS) layer, an n-type silicon wafer, and an ohmic back contact. When a posit…
Infrared dielectric function spectra and phonon modes with polarization parallel and perpendicular to the c axis of high quality, highly relaxed, and single crystalline wurtzite MgxZn1−xO films with 0⩽x⩽0.2 prepared by pulsed-laser deposition on c-plane sapphire substrates were obtained from infrared spectroscopic ell…
Large pore (a = 150-200 A) wormlike and highly oriented cubic (IM3m space group) and 2D-hexagonal (P6m) mesostructured xerogels have been reproducibly synthesised by Evaporation-Induced Self Assembly (EISA). Mesostructure control was attained by changing the template (nonionic block copolymer) and water (h = [H2O]/[Si…