Materials Literature
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The effect of chemical surface treatment on the sensitivity, specificity, and stability of mesoporous Si thin film vapor sensors is studied. The vapor sensors operate by measurement of Fabry−Pérot interference from the porous Si layer, probed using a diode laser operating at a wavelength of 687 nm. Four chemically dis…
Exfoliated PS/Na−MMT nanocomposites were obtained up to 3 wt % of clay without modifying clay organically and DBS−Na affected the degree of exfoliation of silicate layers. The feed rate of monomers also had an effect on polymerization, and it was a key to controlling the total monomer concentration and maintaining a c…
Polyamidoamine (PAMAM) dendrimers are used as carriers to deliver complexed Fe(III) ions uniformly onto silicon oxide substrates for the formation of iron oxide nanoparticles with a narrow diameter in the range of 1−2 nm. Chemical vapor deposition (CVD) synthesis with these nanoparticles affords single-walled carbon n…
Recent studies on the Portevin - Le Chatelier effect report an intriguing crossover phenomenon from a low dimensional chaotic to an infinite dimensional scale invariant power law regime in experiments on CuAl single crystals and AlMg polycrystals, as a function of strain rate. We devise a fully dynamical model which r…
Polyelectrolyte brushes were formed at the interface between hydrophobized mica and water by adsorbing amphiphilic diblock copolymers consisting of a hydrophobic and a charged block. We measured force−distance profiles with the surface force apparatus (SFA) for several polyelectrolyte brushes of different lengths as a…
We report initial NMR studies of i) xenon gas diffusion in model heterogeneous porous media, and ii) continuous flow laser-polarized xenon gas. Both areas utilize the Pulsed Gradient Spin Echo techniques in the gas-phase, with the aim of obtaining more sophisticated information than just translational self-diffusion c…
We report initial NMR studies of continuous flow laser-polarized xenon gas, both in unrestricted tubing, and in a model porous media. The study uses Pulsed Gradient Spin Echo-based techniques in the gas-phase, with the aim of obtaining more sophisticated information than just translational self-diffusion coefficients.…
We report a new method for the purification of HiPCO single-wall carbon nanotubes (SWNT), which consists of the following sequence: (a) organic functionalization of the as-produced nanotubes (pristine tubes, p-SWNT), (b) purification of the soluble functionalized nanotubes (f-SWNT), (c) removal of the functional group…
Gold nanorods have been synthesized by photochemically reducing gold ions within a micellar solution. The aspect ratio of the rods can be controlled with the addition of silver ions. This process reported here is highly promising for producing uniform nanorods, and more importantly it will be useful in resolving the g…
This paper introduces the curing curve analysis, the polymerizing reaction kinetic parameter calculation, and the determination of the relationship between the curing degree and the curing temperature and curing time. For the materials used as the ground insulation of the generator winding, measurements have been made…
The dynamic mechanical properties of epoxy/mica glass-fiber reinforced composites were studied at different aging stages under electrical-thermal stresses and thermal-mechanical stresses. A new method was proposed to calculate the apparent activation energy of glass transition (AAEGT) of epoxy/mica based on dynamic me…
Capacitors made of metallized films of plastics suffer partial discharge named self-healing. This disruptive phenomenon is described as the spontaneous extinction of an electrical arc due to the destruction of the electrodes during the process. In this paper we modelize self-healing by a cylindrical arc that strikes a…
An experiment was performed to clarify how the carrier mobility is influenced by the existence of acetophenone in polyethylene. One side of a polyethylene film, 0.1-mm thick, was soaked with acetophenone. Time-dependent charge distribution was monitored by the pulsed-electroacoustic method, when a "carrier excitation…
The nucleation and growth of Si and Ge clusters/crystallites on SiN x films, which act as relative inert substrates, proceed in a quite complicated manner compared with conventional epitaxial processes. We examine the size dependence of the shape, surface structures and orientation of nano-scale clusters/crystallites.…
Inductors for filtering devices are widely employed in power electronics applications in order to reduce voltage and current harmonics caused by switching converters. The use of ferrite-core inductors is limited to small power applications, whereas air-core and laminated iron-core inductors are employed in the medium-…
This paper investigates the AC electrical characteristics of zinc oxide filled epoxy resin at high electrical fields. The AC conductivity of two filler concentrations, 10% and 20% was measured and compared with the conductivity of unfilled resin. In addition, zinc oxide powder was compressed into solid samples which w…
A digital integrated system is developed to record partial discharge (PD) pulses and to recognize their patterns by waveforms. Special considerations on the experiment circuit are given to electromagnetic shielding, system bandwidth and pattern variety. Both typical laboratory models and simulation models of stator wi…
Time-lag of void discharges was measured in order to establish the physical model for the formation of partial discharge pattern under AC voltages. The measurement with step voltages, using CIGRE Method II electrode system, showed that the statistical distribution of the discharge time-lag depends on the applied volta…
The partial discharge (PD) measurement is a very well known possibility to assess the quality of an insulation system. The aim of the PD-diagnostic is the detection of destruction of electrical insulation as a result of electrical stress especially of PD during operation. Therefore many methods of PD-measurement techn…
The extensive advent of optical communication networks requires new generations of large integrated optical switch matrices able to route information and data streams. We report a novel low cost bistable coupled-waveguide switch based on voltage controlled reorientation of a surface stabilised ferroelectric liquid cry…