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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...
A novel alkoxysilane-functionalized push-pull chromophore was synthesized through a coupling reaction between a benzaldehyde-based chromophore, 4-aldehyde-4'-(N-ethyl-N-2-hydroxyethyl)aminoazobenzene (BA) and 3-isocyanatopropyltriethoxysilane (ICTES). Followed by a hydrolysis and condensation process of the resultant alkoxysilane dye and tetraethoxysilane (TEOS), hybrid inorganic-organic materials...
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...
The new poly(ester-amide)s were prepared by polycondensation reaction of 1,8-diaminooctane or 1,12-diaminododecane with some diacid chlorides containing preformed ester groups. These polymers were characterized by DSC, polarized light optical microscopy, X-ray diffractions, FTIR and GPC. These polyester-amides show thermotropic liquid crystalline properties and are easily soluble in N-methylpyrrolidinone...
A nonlinear optical (NLO) active alkoxysilane chromophore (SGDR1) was successfully synthesized. A fluorinated polyimide/SGDR1 composite was prepared to improve the poor temporal stability of nonlinearity at elevated temperature for the reported poled sol-gel film. The poled composite film was characterized by FTIR, DSC, TGA and UV-Vis. Results show that the composite displays good hydrophobic properties,...
A series of the polyimide-silica NLO nanohybrid materials were synthesized from 3,3', 4,4'- Bisphenyltetracarboxylic (BPDA), 2,2-Bis(3-amino-4-hydroxyphen-yl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2-yl)-diazenyl] azobenzene (HNBDA), coupling agent APTES and hydrolysate of TEOS via sol-gel process. The TEOS contents in...
The article consists of a Powerpoint presentation on a analysis of SMT residues after reflow. The paper concludes that the residues can reduce the SIR, change normal appearances, make error report in ICT testing, decrease curing degree of under-fill and disturb the high frequency and high velocity signal; analyzing the solder paste pre-reflow and post-reflow by DSC, TGA, FTIR and GC/MS, the testing...
Abstract form only given. Lead, a major component in solder, has long been recognized as a health threat to human beings. One of the proposed lead-free candidates is electrically conductive adhesives (EGAs), which are composed of polymer matrix and conductive fillers. Usually epoxy and silver flakes are used as the polymer matrix and conductive fillers, respectively. Recently, Ag nanoparticles were...
Thin films of a fluorinated polyimide derived from 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and 2,3,5,6-tetramethyl-1,4-phenylenediamine have been obtained by spin-coating a solution of polyimide powder dissolved in chloroform. The synthesized polyimide has been characterized by a variety of techniques including Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis,...
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