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Gd2O3:Er3+,Yb3+ microcrystals were prepared by the co-precipitation method using water or ethanol/water as solvents. The effects of solvents on particle size, morphology, and photoluminescence intensity were investigated. The microcrystal were systematically characterized by X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC), scanning electron microscope (SEM), Fourier...
In the present studies, electroless ternary Ni-Co-P alloy deposits were prepared in an alkaline bath and characterizations were carried out to ascertain their properties such as composition, structure, phase transformation behavior and microhardness. The effect of various anions of the metallic sources was studied on the structure and properties of the ternary deposits. The different anionic bases...
Pulverized mold residue of cured epoxy molding compound was reused to produce poly (vinyl chloride) composites with the aim to recycle resources in a more profitable and environmental concern way. The mold residue powder with functional groups on the surface was reactive to polar resins as the results of FT-IR spectrum (FT-IR). Mechanical tests, differential scanning calorimetry (DSC), vicat softening...
Suitable thermal treatments can be used to modify the microstructure of polymer electrets, which in turn may lead to better electret properties. In this paper, non-porous and porous PTFE films are subjected to a thermal treatment consisting of heating at 320°C for 2 min followed by quenching in liquid nitrogen. The influence of such a treatment on the charge stability of the film electrets is studied...
Environmental and health concerns have resulted in significant activities to find substitutes for lead-contained solders for microelectronics. The potential candidates such as Sn-Ag1 and Sn-Ag-Cu1 eutectic solders with melting temperatures of 221?C and 217?C, respectively are the most prominent solders because of their excellent mechanical properties as compared with that of eutectic Sn-Pb solder2...
Polyurethanes with pedant quaternary ammonium salts (QAS) have been shown potent antimicrobial properties against gram-positive bacteria but less sensitive to gram-negative ones. Besides, due to using a large amount of QAS chain extenders, Polyurethanes with pedant QAS have been proven to be high water adsorption and even water soluble. In order to solve the two problems mentioned above, Novel polyurethanes...
Fiber-reinforced composites are used as insulating layers in PCBs to reduce thermal residual stress and warpage due to their low coefficient of thermal expansion (CTE) and high elastic modulus. The composite prepreg is laminated on patterned copper layers by hot-press molding process to apply temperature and pressure cycles. In this study, the lamination process of glass/epoxy woven composite in the...
Work on dielectric spectroscopy of epoxy resin filled with nano-SiO2 at different relative humidities and temperatures is reported. Above the glass-transition temperature (Tg), dc-like imperfect charge transport (QDC or LFD) dominates the low frequency dielectric spectrum. Another mid-frequency relaxation process was found in the non-dried composites. Water also induces glass-transition temperature...
Thermal properties of PE/SiO2 nanocomposites are investigated in the paper by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TG) and differential scanning calorimetry (DSC). Effects of surface treatment of nano-SiO2 on thermal properties of composites are discussed in detail. The results of TG reveal that thermal stabilities of nanocomposites are improved with addition...
It is well known that the morphology is one of the most important factors to affect the dielectric properties of polymeric nanocomposites. In this work, it is thought that the interfacial interaction between nanoparticles and polymer matrix is one of the most important factors affecting the crystalline morphology of the nanocomposites. So the effects of the surface-treatment of CaCO3 nanoparticle...
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