Materials Literature
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Abstract By adopting a room-temperature grinding of the zinc acetate–oxalic acid powder mixture and a subsequent thermal decomposition reaction, agglomerated ZnO nanocrystals with diameters of 15–40 nm were prepared. By adding NaCl in the whole process, well-dispersed ZnO nanocrystals with diameters of 3–4 nm, showing…
Ennoblement, a phenomenon in which open-circuit potential is elevated to a noble value, triggers metal corrosion in the environment and is considered to be biologically catalysed. This study investigated the involvement of marine microorganisms in the ennoblement of stainless steel coupons in sea water pumped from Kam…
Abstract A polypyrrole deposited electrochemically on tungsten coil showed 11.6% strain and 0.20 N force induced electrochemically. The W coil significantly reduced iR drop of the PPy, resulting in improving performance of the actuator. The fibrelike structure was suitable for applications of artificial muscles.
Abstract Well-patterned crystalline nanowire arrays of binary compound metal sulfides, CdS, ZnS, and In2S3, were synthesized for the first time employing a simple impregnation reaction procedure from two separate precursors (metal and sulfur precursors) using mesoporous SBA-15 as a hard template.
High-resolution electron microscopy and energy-filtered imaging methods were used to examine single-wall carbon nanotubes and nanotube reinforced polyimide composites. The nanotubes were studied alone, in a polyimide matrix composite, and after deposition of composite material previously dissolved in a solvent. Energy…
Current perpendicular to the plane, giant magnetoresistance (GMR) and the spin-valve effect were observed in Co/Cu multilayered nanowires electrodeposited into self-organized nanoporous anodized aluminium templates grown at the surface of bulk aluminium. Pores as short as 2000 nm could be used. The pore bottom oxide l…
Abstract Highly dispersed Au catalysts were active for the direct formation of H2O2 form H2 and O2. Especially, the rate of H2O2 production greatly increased when Au nanoparticles were deposited onto SiO2, MCM-41 and active carbon supports.
Strong photoluminescent emission has been obtained from 3 nm PbS nanocrystals in aqueous colloidal solution, following treatment with CdS precursors. The observed emission can extend across the entire visible spectrum and usually includes a peak near 1.95 eV. We show that much of the visible emission results from abso…
This works presents the theoretical study on several correlation integrals of the capacitance transients of the deep levels. The deconvolution of the transient signals was the major subject of the number of methods referred to under the common name as the Deep Level Transient Spectroscopy methods. In general the separ…
Highly p-type GaAs:C was ion-implanted with Mn at differing doses to produce Mn concentrations in the 1 - 5 at.% range. In comparison to LT-GaAs and n+GaAs:Si samples implanted under the same conditions, transport and magnetic properties show marked differences. Transport measurements show anomalies, consistent with o…
Density functional calculations have been performed to study the molecular structure and chemical properties of selected lanthanide(III) texaphyrins (Ln-Tex2+, Ln = La, Gd, Lu). The lanthanide element is found to reside above the mean N5 texaphyrin plane, and the larger the cation, the greater the observed out-of-plan…
We show that the recently synthesized BF3-doped polyaniline (PANI) exhibits remarkable stability against thermal ageing. Unlike the protonated PANI, which shows rapid degradation of the conductivity on heating in air, BF3-doped PANI shows more than an order of magnitude improvement in conductivity. We employ x-ray pho…
The alkali halides have been studied very frequently for their simple structures and interesting properties, for example, the high-pressure induced transition$^1$. There are several successful models that can be employed. The most famous model of them is the Tosi-Fumi interionic potential$^2$ which is an empirical pot…
The palladium(0)−copper(I)-catalyzed polymerization of 1,4-diethynyl-2,5-bis(decyloxy)benzene ( I ), 1,4-bis(2-ethylhexyloxy)-2,5-diiodobenzene ( IIA ), 1-(6-(4-(hydroxymethyl)phenoxy)hexyloxy)-2,5-diiodo-4-methoxybenzene ( III ), and iodobenzene ( IV ) yielded a highly soluble, exclusively para-linked poly(phenylenee…
π-Conjugated poly(1,10-phenanthroline-3,8-diyl), PPhen, and its 5,6-dialkoxy derivatives, PPhen(5,6-OR)s, have been synthesized by using an organometallic polycondensation with a zerovalent nickel complex. They had average molecular weights of 4300−6800. PPhen had a stiff structure, as revealed by a light scattering m…
The definition of softness and local softness using the density of states (DOS) and local density of states (LDOS) given by Yang and Parr for metals has been casted into working equations and applied to sequences of finite cylindrical fullerenes modeling the (5,5) and (10,10) single-walled capped carbon nanotubes. The…
Computer simulations of perfectly branched dendrimers up to the sixth generation have been performed under the influence of uniaxial elongational flow for the first time for a model with explicit dendritic topology. The Brownian dynamics simulation technique has been applied to a freely jointed bead−rod model with exc…
Yb-doped YAG is becoming a very promising optical material. We present a synthesis of single-phase Yb-doped YAG powders and thin films at a significantly lower temperature by sol−gel methods than by other conventional techniques. Yb-doped YAG powders and thin films on Si(100) substrates with a series of different dopi…
The disassembly of dendritic structures was realized by a cascade cleavage reaction triggered by an initially stimulated group in the dendrimer periphery. A depolymerizable backbone was engineered into prototypical dendritic structures. Evidence for the completion of the disassembly process is provided by the absorban…
A topographically patterned substrate can be used to template a large, single crystalline grain of block copolymer spherical domains. Both the geometry of the substrate and the annealing temperature can be used to control the degree of order as well as the crystallographic orientation of the grain. The presence of a h…