Materials Literature
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We study theoretically the influence of the underlying domain microstructure on the electromechanical properties of ferroelectrics. Our calculations are based on a continuum approach that incorporates the long-range elastic and electrostatic interactions. The theory is used to simulate the piezoelectric properties of…
We present results on the direct spatial mapping of the wave-function of a hole bound to a Mn acceptor in GaAs. To investigate individual Mn dopants at the atomic scale in both ionized and neutral configurations, we used a room temperature cross-sectional scanning tunneling microscope (X-STM). We found that in the neu…
Dielectric permittivity \ensuremath{\varepsilon} as a function of temperature is measured in ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ and a number of other relaxor ferroelectrics with the perovskite structure. It is found that the data taken from the high-temperature slopes of the diffused permittivi…
The chemical conversion treatment for aluminium alloys based on the immersion in cerium chloride/hydrogen peroxide solutions is one of the possible alternatives to the chromate conversion process for the corrosion protection of aluminium alloys. The nucleation and growth of the cerium-based conversion coating on AA202…
The activation of dioxygen via dissociation on strained and stepped gold surfaces has been studied using periodic self-consistent (GGA-PW91) density functional theory (DFT) calculations. Although we find that molecular oxygen does not adsorb on Au(111), it does bind, albeit weakly, to an Au(111) surface stretched by 1…
We demonstrate how an iterative method for potential inversion from distribution functions developed for simple liquid systems can be generalized to polymer systems. It uses the differences in the potentials of mean force between the distribution functions generated from a guessed potential and the true distribution f…
The kinetics of relaxation of disclination quadrupoles formed within triple junctions of grains during plastic deformation are studied. The calculations are made using the discrete dislocation model for disclinations by simulating the climb of dislocations. Exponential relationships are obtained for the relaxation of…
We present low-temperature heat capacity measurements performed on two different kinds of single-walled carbon nanotube bundles which essentially differ in their mean number of tubes ( N T ) per bundle. For temperatures below a few kelvin, the vibrational heat capacity can be analysed as the sum of two contributions.…
We have studied the low energy spin excitations in n-type CdMnTe based dilute magnetic semiconductor quantum wells. For magnetic fields for which the energies for the excitation of free carriers and Mn spins are almost identical, an anomalously large Knight shift is observed. Our findings suggest the existence of a ma…
MOTIVATION: The development of powerful automatic methods for the comparison of protein sequences has become increasingly important. Profile-to-profile comparisons allow for the use of broader information about protein families, resulting in more sensitive and accurate comparisons of distantly related sequences. A key…
We have studied the optical properties of a novel quantum dot–microcavity system consisting of CdTe nanocrystals attached to a melamine formaldehyde latex microsphere. The spheres were studied using conventional and confocal microscopy, the confocal system revealed defects in some spheres. The coupling between the emi…
The diffraction efficiency as a function of the externally applied voltage exhibits an unusual trend for a holographic grating written in a nanotube-doped liquid-crystal cell composed of two glass substrates with asymmetric patterns of filmy transparent indium–tin oxide. Experimental evidence suggests that output ener…
Abstract Reactions of NiCl2·6H2O and Ni(CH3COO)2·4H2O with tridentate ligand yielded di- and trinuclear nickel(II) complexes of [Ni2(HL1)2Cl2(MeOH)2] (1) and [Ni3(HL2)2(CH3COO)4(MeOH)2] (2) (H2L1 = N-(2-hydroxybenzyl)ethanolamine), H2L2 = N-(2-hydroxybenzyl)propanolamine), respectively; the magnetic susceptibility mea…
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.