Efficient two-steps method for the synthesis of octa(aminopropylsilsesquioxane)(OAPS) was described in this paper. The chloride salt of OAPS was prepared by the hydrolytic condensation of γ-aminopropyltriethoxysilane in methanol, with hydrochloric as a catalyst. The influence of several processing on the synthesis has been ascertained. The chloride salt of OAPS can be obtained in 42.1% yield after a reaction time of 18h, which is a much shorter than that required for traditional method. Neutralization of the chloride salt of OAPS to OAPS was accomplished by eluting solutions of this hydrochloride in methanol through a column of Amberlite 717 ion-exchange resin. The structure of products was determined by FTIR, MS, Elemental analysis, 1H, 13C, and 29Si NMR. TG curve of OAPS shows that the compound has high decomposition temperature and higher char residue yield.
The TPGDA drop was suspended in the atmosphere under acoustic levitation and induced by photoinitiation for polymer preparation at the first attempt. The kinetics of TPGDA photopolymerization induced by the UV light under containerless condition was studied. Compared to the normal condition, the average initial polymerization rate of TPGDA under acoustic levitation is relatively lower, while the final conversion is higher. Relative to oxygen inhibition, container effect plays a more significant role on the conversion in this polymerization system.
The combinatorial material library approach is an excellent innovation for inorganic functional material research, and it can discover and screen new materials efficiently. In this paper, it is used to quickly find and improve Tb3+activated gadolinium aluminate perovskite phosphors (Gd1-x-yAlO3: Tbx, REy, RE ion vary among Ce3+,4+, Dy3+, abbreviate as GAP:Tb,RE). Under UV light excitation, Gd1-x-yAlO3: Tbx, REygradational combinatorial library indentifies the “lead” green luminescent compound as GAP:Tb0.1from all the GAP:Tbx(x=0.05~0.15) candidates in a quick way. Then the relationship between sensitizers and activators can be also mapped out quickly, that Dy3+, is a good sensitizer for Tb3+,activator while Ce3+,4+is not a suitable one. The photoluminescent excitation (PLE) and photoluminescent emission (PL) spectral indicate the resonance energy transfer between the activator and sensitizer must have happened, which leads to Ce3+,4+co-doping decrease Tb3+green luminescence(5D4→7F5,544nm) while Dy3+co-doping increase green luminescence. The candidates in the library are prepared in powder form by nitric-citric method for more detailed characterization. All the screening results, obtained from the combinational library, are coherent with the powder phosphor experiments.
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