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An experimental study was carried out to investigate the structural stability of ethylene glycol based titanium dioxide nanoparticle suspensions (nanofluids) prepared with two-step method. Effect of particle concentration, fluid temperature, shear rate and shear duration were investigated. It was found that the temperature resolved thermal conductivity of nano fluid-, followed die trend of the base...
As a kind of middle-temperature PCM (Phase Change Material), paraffin is perfect except for its poor thermal conductivity. Nano-aluminum, which has high thermal conductivity and good compatibility, was added into paraffin to improve its thermal conductivity. Surface modified technology was adopted and dispersant was used to prepare uniform and stable organic phase-change nano-fluid of paraffin and...
In this paper, the effect of different weight percentage of ZnO nanoparticles on the optical properties of the nanocomposite MEH-PPV:ZnO thin films was studied. The samples were prepared using sol-gel spin coating method on glass substrates. Current-voltage properties of the thin films were investigated. The conductivity of the samples increases with the increment of the ZnO nanoparticles except for...
As one of the promising lead-free interconnection materials, electrically conductive adhesive (ECA) has made considerable advances in recent years. Compared to metal solder, ECAs offer numerous advantages, such as environmental friendliness (elimination of lead usage and flux cleaning), mild processing conditions, fewer processing steps (reducing processing cost), low stress on the substrates and...
Convective heat transfer rate of traditional fluids are very lower than solid particles. The use of additives is a technique applied to enhance the heat transfer performance of base fluids. Suspension of millimeter or micrometer sized solid particles conduct more heat than the base liquids. The major problem with the large particles is rapid settling in fluids, abrasion and clogging. The fluids with...
Nano-sized BaSrTiO3 particles and a dispersant were incorporated in samples of low density polyethylene (LDPE). The nanoparticle loading was 2% or 10% by weight (w/w), and the dispersant loading was 4 parts per hundred relative to BaSrTiO3. dc conductivity measurements were made in the temperature range 30-70°C in vacuum, and in air at 30°C. The vacuum dc conductivity in samples containing only the...
Various samples based on bisphenol-A type epoxy resin were prepared. Composites were produced containing various amounts of aluminum oxide, aluminum nitride and magnesium oxide, using ex-situ polymerization of surface functionalized particles. The average particle size of the used filler material ranged between 22 nm (magnesium oxide) and 60 nm (aluminum nitride). Synthesis of the samples is described...
Specific properties of insulation systems based on thermosetting and thermoplastic polymers can be enhanced by adding different types of inorganic fillers. The focus of this paper is on the effect of the filler size and modifications of the crystallinity of aluminum oxide (Al2O3) nanoparticles on the dielectric and thermal properties of epoxy-based composites. Nanoalumina in the α, γ and δ phases...
Insulating vegetable oils are fire-resistant and environment-friendly liquid dielectrics. This paper presents a type of nano-modified insulating vegetable oil. The nano-modified insulating vegetable oil was prepared by homogeneous precipitation deposition of ferroferric oxide nano-particles. It was characterized by a laser nano-particle size analyzer. Its electric properties, including AC breakdown...
In this work, we reported that the highly electrical conductive poly (vinyl chloride)-solvothermally reduced graphene (PVC-STRG) nanocomposite was successfully prepared by colloidal blending method. PVC latex was synthesized by miniemulsion polymerization. The stable aqueous STRG suspension was prepared in the presence of sodium lauryl sulfate surfactant. For the first time, the simple filtration...
Nanopowders with compositions Ce0.8Gd0.2O2-δ (CG), Ce0.8Sm0.2O2-δ (CS), and Ce0.9Eu0.1O2-δ (CE) have been synthesized by a modified Pechini method. X-ray diffraction (XRD) revealed that all powders calcined at 550°C were single phase, with the cubic fluorite-type structure. The good sintering properties of the synthesized nanopowders allowed us to obtain dense ceramics (>97% theoretical density)...
To meet the demands for increased integration and multi functions for multilayer electronic components the related materials and process technique for layer-to-layer interconnection have to be developed together. Using nano-, micro-sized metal powders and epoxy resins conductive via pastes have been formulated. Via conductance was measured before and after solder floating(288 °C) to observe the change...
Electrical as well as mechanical properties of electrically conductive adhesives can be modified by addition of different types of nanoparticles. It has been investigated if changes of the resistance of adhesive joints caused by thermal ageing will differ in dependence on the type of nanoparticles added into adhesives. It has been found that adhesive joints formed of adhesives modified such the way...
Conductive adhesives are generally considered to be one of the strongest candidates for replacement of solder in electronics industry. However, some problems related to the performance have so far limited wider applications of conductive adhesives. One of the major problems is tendency to degrade during temperature and humidity aging. In this paper, two kinds of Isotropic Conductive Adhesives (ICA)...
Printed electronics have become research focus due to their distinct characteristics such as tiny, flexible, thin, and easy to carry. Printed electronics have shown great potential in daily use, such as RFID tags, smart cards and displays. Silver nanoparticles have been applied as conductors in printed electronics. Different kinds of chemicals are used as solvent and stabilizers to prepare nano silver...
Laser sintering of inkjet-printed silver nanoparicles was studied. Conducting lines were printed on glass and PET substrates of various thicknesses by a drop-n-demand (DOD) inkjet printer and silver nanoparticle ink. Selective sintering of the printed silver nanopartilces was then performed using laser beam to enhance electrical conductivity. Focused laser beam was irradiated normally to the silver...
The development of devices for electric stress control includes several significant challenges for polymer composite dielectrics, including the need for high permittivity, high mechanical strength, high thermal conductivity, good dielectric strength, and good ductility. However, the conventional methods to increase the permittivity of a polymer suffer from very low mechanical and dielectric strength...
This paper presents a progress update with the development of nanostructured dielectric materials for various high energy, high power density electrical applications. It is demonstrated that novel electrical/dielectric properties can be achieved via the nanostructure and interface engineering. We present a high level summary of the progress achieved as well as challenges remaining in nanostructural...
This paper realizes the low-cost mm-Wave antennas using inkjet printing of silver nano-particles. It is widely spread that fabrication of mm-Wave antennas and microwave circuits using the typical (deposit/pattern/etch) scheme is a challenging and costly process, due to the strict limitations on permissible tolerances. Such fabrication technique becomes even more challenging when dealing with flexible...
Nano-sized BaSrTiO3 particles and a dispersant were incorporated in samples of low density polyethylene (LDPE). The nanoparticle loading was 2% or 10% by weight (w/w), and the dispersant loading was 4 parts per hundred relative to BaSrTiO3. dc conductivity measurements were made in the temperature range 30-70°C in vacuum, and in air at 30°C. The vacuum dc conductivity in samples containing only the...
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