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This paper reports a novel bioMEMS device that integrates mechanical constriction for single cell trap in the channels, which are enclosed by thick (or 3D) C-PDMS (carbon-black-PDMS) electrodes and bottom planar transparent electrode for dielectrophoretic (DEP) cell manipulation. Leveraging hydrodynamics and dieletrophoresis, this simple biomedical microsystem enables more efficient loading of one...
Carbon nanotube (CNT) was modified with TDI molecules in order to improve the dispersion of carbon nanotube fillers in organic phase. Semi-conductive layer prepared by epoxy matrix with 0.045 phr CNT was second-time bonded to the neat epoxy for preparing double-layer composite. Broadband dielectric spectroscopy was performed to measure the complex permittivity of neat epoxy, epoxy — CNT/epoxy double-layer...
Generally, UHV converter transformer bushing cores use epoxy resin and insulating paper composite materials as the main insulating dielectric. It is necessary to study the space charge behavior of epoxy resin/insulating paper composites at high temperature and field strength. According to the insulation structure of dry-type bushing core, two epoxy/paper/epoxy three layers Composite samples with different...
Epoxy resin has been widely used in dry-type insulation application such as DC dry-type bushings. In practice, DC dry-type bushings work not only under DC voltage, but also under multiple harmonics with 50Hz fundamental frequency. This study focuses on the effects of space charge behavior of epoxy resin on real voltage of DC dry-type bushings. By using Fourier decomposition, the real voltage of DC...
A new-type of SF6 gas-insulated HVDC wall bushing has been manufactured. The double-layer electrodes are introduced to grade electric fields instead of traditional capacitor foils. Therefore, the electric-field distribution of inner insulation is quite different from traditional productions as well as structure design. This paper presents finite element analysis (FEA) of this type of bushing. The...
Silicone rubber makes composite insulators show excellent moisture dirt performance because of its hydrophobicity. In the wet environment, separated water droplets instead of continuous water film will form on the surface of composite insulators, helping curb the occurrence of arc in high-strength field. However, separated water droplets will distort the electric field easily leading to the partial...
The effect of electrode material on the space charge behavior in epoxy resin has been investigated using the pulsed electro-acoustic (PEA) technique. Common metallic electrode materials, i.e. gold, silver and copper, were selected and sputter-coated on the specimens, and the space charge dynamics after the application of various electric fields were monitored at 293 K and 313 K. The space charge accumulation...
In order to study the interfacial effect on space charge distribution in HVDC bushings which impregnated with epoxy resin, samples just like epoxy-impregnated paper-epoxy were prepared by vacuum casting process. Space charge characteristics have been studied by the method of pulsed electroacoustic (PEA) technique at different electric fields and temperatures, including charge polarity, charge amount,...
Arc tube bulbs for metal halide lamps are made from quartz glass. Generally, bulbs come in ellipsoidal or spherical shapes with both ends necked down. Quartz glass tubes are melted by flame heating and stockpiled, and then burned to shaped bulbs by means of clamping or roller finder method. After that, cleanse the surface of bulbs to remove silica powder, and separate out hydroxyls in a high-temperature...
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