Materials Literature
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The self-consistent field theory of brushes of neutral water-soluble polymers described by two-state models is formulated in terms of the effective Flory interaction parameter χeff(T,φ) that depends on both temperature, T, and the monomer volume fraction, φ. The concentration profiles, distribution of free ends and co…
The mutual diffusion coefficient Dm of dilute lysozyme solutions is measured by the dynamic light scattering technique. The relation between the osmotic second virial coefficient B22 and the protein mutual diffusion coefficient Dm of dilute solutions is examined experimentally and theoretically. The role of B22 in rel…
A newly modified sonochemical approach was demonstrated to synthesize stable Au suspensions. The formation of Au nanoparticles with diameters of ∼20 nm was accomplished through the ultrasonic irradiation of aqueous HAuCl 4 solutions containing trisodium citrate at 4 °C. The efficient generation in gold particles only…
The influence of interfacial bonding on the magnetoelectric response in multiferroic laminated composites of Tb1−xDyxFe2 (Terfenol-D) and lead–zirconate–titanate (PZT) by using the recent Green’s function technique was studied. Numerical results demonstrate that a giant magnetoelectric response is produced in the simp…
Specific heats measurements and Ru-NMR studies have been carried out for Bi3Ru3O11 and La4Ru6O19, which commonly have three-dimensional linkages of edge-sharing pairs of RuO6 octahedra. The Knight shifts, the nuclear spin-lattice relaxation rates 1/T1 and the electronic specific heats Cel of these systems exhibit anom…
We discuss the influence of a uniform current, $\vec{j} $, on the magnetization dynamics of a ferromagnetic metal. We find that the magnon energy $ε(\vec{q})$ has a current-induced contribution proportional to $\vec{q}\cdot \vec{\cal J}$, where $\vec{\cal J}$ is the spin-current, and predict that collective dynamics w…
Two-dimensional micrometer-sized single-crystalline ZnO thin nanosheets were achieved on a large scale, in which Zn thin nanosheets (precursor) were first grown via a thermal decomposition and reduction of the starting ZnS powder, and then converted to the ZnO nanosheets via a simple oxidation process. The ZnO nanoshe…
A representative polyoxometalate, alpha-12-tungstophosphatic acid (PW12(3-), POM), is loaded on the surface of TiO2 particles used as a cocatalyst to gain further insights into the underlying reaction mechanism and to estimate the feasibility of using the new POM/TiO2 cocatalyst in the photocatalytic degradation of 2,…
In this work a combined experimental and theoretical study on carbon nanotube (CNT) based system for gas sensing applications is reported. Carbon nanotubes thin films have been deposited by plasma-enhanced chemical vapor deposition on Si3N4/Si substrates provided with Pt electrodes. Microstructural features as determi…
Raman spectroscopy on surfactant-dispersed, aqueous suspensions of single-walled carbon nanotubes is used to verify the energies of interband transitions and validate the spectral assignments of semiconducting and metallic nanotubes determined by spectrofluorimetry for the former and Raman excitation profiles for the…
The influence of silver (Ag) nanoparticles on the properties of poly(vinyl alcohol) (PVA) was investigated. The nanocomposite was prepared by mixing a colloidal solution consisting of silver nanoparticles with a water solution of PVA in appropriate ratios. Composite films with different contents of inorganic phase wer…
A noninvasive ultra-wide band (UWB) partial discharge technique was employed in high capacity motors diagnosis. Those motors are installed and operating in an oil pumping plant. The technique presented here was applied to 13 motors rated at 13.8 kV and 2500 HP of capacity. The technique allowed motors insulation syste…
Two types of film thickness standards have been developed, manufactured and investigated - for X-ray reflectometry (XRR), X-ray fluorescence analysis (XRR), electron probe microanalysis (EMPA) on the one hand, and ellipsometry on the other. Metrological characterisation of both specific kinds of material measures and…
Structural transitions in melts as well as their dynamics are considered. It is supposed that liquid represents the solution of relatively stable solidlike locally favored structures in the surrounding of disordered normal-liquid structures. Within the framework of this approach the step changes of liquid Co viscosity…
The catalytic mechanism of dihydrofolate reductase (DHFR) requires the addition of both a proton and a hydride ion. In Escherichia coli dihydrofolate reductase (ecDHFR) Asp27 is considered as the only group in the active site capable of providing the proton for the reduction of the N5−C6 bond, although it is not clear…
The electronic and structural properties of molecules (octahydrosilsesquioxane, H 8 Si 8 O 12 ), the monosubstituted and higher phenyl-substituted octahydrosilsesquioxanes (PhH 7 Si 8 O 12, Ph 2 H 6 Si 8 O 12, (Ph-Ph)H 7 Si 8 O 12, and Ph 8 Si 8 O 12 ), and crystals (H 8 Si 8 O 12 and octa(phenylsilsesquioxane) aceton…
Chemical oxidation of single wall carbon nanotubes (SWNTs), produced with the HiPco method, is studied by resonance Raman scattering. The analysis of the radial breathing mode makes it possible to assign the observed bands to metallic and semiconducting SWNTs and to suggest the chiral indices of SWNTs contributing to…
A computational technique was developed to model and simulate molecular or atomic behaviour of materials under static loads. Interatomic potential was used to maintain equilibrium among molecules or atoms under loads and constraints. In addition, a smeared continuum model was derived to represent a very large number o…
ABSTRACT Projectiles of sintered tungsten alloy were fired directly at two kinds of steel target plates. The microstructures near the perforation of a medium, 0.45% carbon steel target plate can be identified along the radial direction as: melted and rapidly solidified layer, recrystallized fine‐grained layer, deforme…
A model of randomly grafted AB copolymer melts is constructed in which flexible B polymer grafts are statistically attached at three possible sites along flexible A polymer backbones. An incompressible melt of such molecules is examined theoretically at equilibrium for two situations: (1) the grafting is irreversible…