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Isotropic conductive adhesives (ICAs) are a type of interconnect material used more and more widely in computer, robot, mobile phone, LED and so on. Compared with traditional solders, isotropic conductive adhesives have better working plasticity, creep resistance and heat resistance. In particular, isotropic conductive adhesives are more responsive in high density packaging than solder, which determines...
The 23 full-factorial Central Composite Design (CCD) and response surface methodology (RSM) was applied to explain the effect and interaction of three factors in the process of Fe3O4/SiO2 nanoparticle: NaOH dosage, Fe3O4/SiO2 ratio and Fe2+/Fe3+ ratio. For the CCD optimization purposes, the canonical parameters was employed where the predicted average size of the nanoparticles was 115.39 nm, and the...
This study investigates the effects of toluene adsorption on the filtration efficiency of nanoparticles by a fluidized-bed adsorption reactor. Simulated flue gas is modified by different types of nanoparticle (SiO2 and Al2O3) with various particle sizes (10 and 80 nm) are also carried out in experiment. Therefore, the experimental results show that the removal efficiencies of the nanoparticles and...
Hydrophobic nanostructured silica (SiO2) particles were synthesized from sprayed droplets of a colloid containing SiO2 nanoparticles, a surface modifier and a solvent by aerosol assisted self-assembly. Trimethylchlorosilane (TMCS) and ethyl alcohol were used as a surface treating agent and a solvent, respectively. Morphology, pore size distribution, specific surface area, chemical bonds, and hydrophobicity...
We present the fabrication method for the nonspherical or macroporous particles such as binary colloidal aggregates or shape-anisotropic particles from water-in-oil emulsions as confining geometries for the self-organization. Here, the water droplets contained various combinations of two different colloids: monodisperse silica or polystyrene microspheres for larger particles and silica or titania...
Silica (SiO2) filled epoxy with a particle size in μm-range has been established during the last decades. Now it has become possible to produce SiO2-filled epoxies, with filler particles in nm-range, which can be located in the polymer homogenously and without agglomerates. A new group of materials with a high percentage of inner boundaries has been designed. Therefore, the effect of this high interface...
This paper evaluated the influences of silica nanoparticles on the dielectric properties, mechanical performances and glass transformation behaviors of epoxy resin by analyzing the temperature dependence of dc conduction and dielectric loss, impact test results and dynamic mechanical data, respectively. The particular attention was given to the correlation between the glass transformation behaviors,...
Various epoxy-based samples were prepared with different content of micro- and nanosized silica filer. In the case of a constant %-weight content of filler amounting to 65%, the microphase was replaced by a nanophase consisting of 2.5% and 5% weight. Three research teams used dielectric spectroscopy to compare the dielectric behaviour of the different composites. Microstructure analyses of the various...
Epoxy polymers reinforced with a premixed epoxy/nano-silica masterbatch or dry non-surface-treated nano-silica and ground micro-silica flour were compared. Cured plates of epoxy containing both nano-particles (up to 15 %wt) and micro-particles (up to 51 %wt) of silica were produced and tested. The glass transition temperature, Tg, of the epoxy was measured using differential scanning calorimetry (DSC),...
The nanocomposite has been prepared on the basis of the siliconized polyester impregnating varnish added with nanosilica by using the own patented method. The properties of the nanocomposited and standard varnishes were determined and compared. A clear increase of bond strength and thermal endurance was found although the most improved property have appeared the resistance to partial discharges under...
Eu/SiO2 Nanoparticles was prepared through sol-gel method. The gel was synthesized through the hydrolysis of a complex solution of containing tetramethoxy-silicane (TMOS) and EuCl3·6H2O. X ray diffraction analysis showed that that there are crystalline materials appeared in the amorphous SiO2. The fluorescence spectroscopic analysis showed that the Eu/SiO2 fluorescence peaked at 590 nm with excitation...
A novel type of Rubpy-doped fluorescent nano-particles has been prepared using a water-in-oil(W/O) microemulsion method. Characterizations by transmission electron microscopy, fluorescent spectra, photostability experiments and dyeleaking experiments show that the nanoparticles are spherical, monodisperse, and uniform in sharp and size (70 ± 5nm). Due to a lot of fluorescent dye molecules encapsulated...
Low cost and low temperature fabrication process is required for TSV. In this study, we propose a low temperature deposition of barrier and copper seed layers by wet process only using electroless plating. Moreover, we use AuNPs as a catalyst which is densely adsorbed on SiO2 sidewall of TSV with SAM. We succeeded in conformal deposition of barrier and seed layers, and this method is effective for...
This work presents some electrical characterisation performed on nanocomposite materials. These compounds were obtained by the dispersion of inorganic nanoparticles into a matrix of High and Low Density Polyethylene (PE). The nanocomposites have been prepared by melt compounding using a twin screw extruder. The dielectric breakdown strength of the nanocomposites was investigated using AC progressive-stress...
Luminescence properties of the oxidized Si-rich SiNx films prepared at low temperature were investigated. Strong photoluminescence from the samples can be observed at room temperature. The spectral profile exhibits some obviously modulated features upon the excited wavelength. By employing the oxidized Si-rich SiNx films as the luminescent active layers, the devices with low turn-on voltage have also...
A supermagnetic iron oxide (SPIO) microspheres is emerging as an ideal tool for cell tracking and drug targeting delivery. However, its low intracellular labeling efficiency has limited the potential usage. We have developed CdTe-incorporated CMCH/SiO2-coated core-shell composite microspheres, Fe3O4@SiO2@CMCH/CdTe (FSCC), with diameters of 210 nm, as a multifunctional magnetic vector that can efficiently...
Evanescent wave fluorescent sensors have developed for 30 years. Nonetheless, the technology continues to evolve with new breakthroughs in optics, biochemistry, and chemical engineering. Recently, there have been explosive developments in the Metal-Enhanced Fluorescence (MEF) technology to favorably modify the spectral properties and to alleviate photo-physical constraints. We report the development...
Ni-Fe-SiC alloy is a promising material in the fabrication of micro actuator. Electrolytic codeposition technique was adopted in the deposition of Ni-Fe-SiC composite coating on stainless steel substrate, using nickel alloyed with iron as the binder phase and SiC as dispersed particles. The morphology analysis indicated that the deposit with SiC nanoparticles is level and compact and the crystal-planes...
SiO2 nano-powder is a new type of augmented injection agent, has the ability of stronger hydrophobicity and lipophilicity, and can be adsorbed on the rock surface so that it changes the rock wettability. It can expand the pore radius effectively, reduce the flow resistance of injected water in the pores, enhance water permeability, reduce injection pressure and augment injection volume. Using artificial...
Isotropic conductive adhesives (ICAs) with lower bonding temperature, higher resolution and environmental friendly have been used extensively in packaging process. In order to improve the electrical and thermal conductive properties of ICAs, two kinds of bimodal high temperature stable ICAs with matrix SHT6 and fillers with composition of macro silver flakes and boron nitride nanoparticles or macro...
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