Materials Literature
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By performing molecular dynamics simulations we have generated several forms of high density amorphous (HDA) water (ρ⩾1.1 g/cm3), either by pressurizing cubic ice or by quenching liquid water maintained under pressure. It is shown that the temperature of amorphization is a key variable in understanding the thermodynam…
Abstract Copolymers of aniline and toluidine were synthesized by oxidative chemical polymerization using different ratios of the monomers in the feed, and characterized by a number of techniques including UV–visible, IR, Raman, 1 H NMR and EPR spectroscopies, as well as by thermogravimetric analysis and conductivity m…
We report on the characteristics of SiO2/n-GaN metal-oxide-semiconductor (MOS) structures with β-Ga2O3 interlayers. β-Ga2O3 15 nm thick was grown by dry oxidation at 800 °C for 6 h, and 100-nm-thick SiO2 was then deposited by sputtering. Capacitance–voltage measurements show a low interface trap density of ∼3.9×1010 e…
We have achieved the size separation of DNA molecules on a biochip using an anodic porous alumina as a separation matrix in electrophoresis. The bottom of the microfluid channel on the chip was made of a porous alumina membrane that has uniform nanoscale pores on its surface. Since smaller molecules are much more freq…
Zinc oxide (ZnO) thin-film waveguides with ridge structures have been fabricated on n-type (100) silicon substrates. The deposition of high-crystal-quality ZnO thin films on the lattice-mismatched silicon substrate was achieved by using the filtered cathodic vacuum arc technique. A ridge structure is defined on the Zn…
Nanohole arrays in a Si substrate with a self-ordered configuration having a 100 nm hole periodicity were fabricated by the pattern transfer of the hole configuration of anodic porous alumina. The self-ordered anodic porous alumina used as a mask was directly prepared by anodizing an aluminum film sputtered on a Si su…
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…