Preparation of Non-Grinding Long Afterglow SrAl2O4 ：Eu^2＋ , Dy^3＋ Material by Microwave Combustion Method

The non-grinding long afterglow material SrAl2O4：Eu^2＋ , Dy^3＋ was prepared by combustion method in home mierowave oven direetly, after dispersant, frother, eomburent, and mineralizer were added into the reacting system. XRD analysis showed that the powders were nearly pure SrAl2O4 phase with few other phases, and the size of the grain was 41.1 nm. Fluoreseenee speetrum results indieated that there were 2 exeitation peaks loeated at 345 and 400 nm, and the emission peak loeated at 516 nm, afterglow lasted up to 30 min or more. The mierowave eombustion method has advantages of less time, low temperature and no grinding process, and the material made by the method has good luminescent property.     

煤的芳烃化学研究进展

当世界上的石油资源逐渐枯竭之后，煤能否成为２１世纪化学工业的原材料？科学家们正面临极富感染力的挑战，即寻找和发展一条利用液化煤中的芳烃化合物合成有机化学品的新途径。近期研究表明，新兴的煤化学工业具有很大的发展潜力。本文主要讨论和介绍煤的非燃料利用问题，研究发展由煤制取芳烃化学品和材料的可能途径。综述有关文献２６篇。     

Spectral Characteristic and Its Regularity of Rare Earth Ions in Inorganic Microporous Material Ⅰ.The Spectral Characteristics of Eu~(3 ) in NaY,NaX and NaA Zeolites

In this paper,we have investigated the spectral characteristics of Eu~(3 )ion sorbed on NaY,NaX and NaAzeolites.During calcination,the influence of Eu~(3 )ion's positions in zeolites on its spectral structures are dis-cussed emphatically.The experimental results show that the electric dipole-to-magnetic dipole transition inten-sity ratios of Eu~(3 )emission in NaY,NaX and NaA zeolites calcinated at the same temperature increase inproper order.The bonding actions between Eu~(3 )ion and framework oxygens are studied by the measurementsof excitation spectra and X-ray photoelectron spectroscopy.In the Eu~(3 )content ranging from 0.95% to10.5%,the concentration quenching of the fluorescence in Eu(Ⅲ)-NaY is not observed.     

表面包覆制备云母系珠光颜料研究现状

介绍了天然白云母表面包覆金属氧化物、非金属氧化物、稀土氧化物和有机颜料或染料等制备云母系珠光颜料的研究现状     

丙酮酸及系列产品的检测与应用

丙酮酸及系列产品在化工、生化、制药和农用化学品等工业及科学研究中有着广泛的用途.丙酮酸及系列产品的纯度、含量、杂质等质量指标与合成方法有关,不同的应用途径对这些指标也有着不同的要求.本文综述了丙酮酸及系列产品质量指标的检测方法,以及丙酮酸及系列产品的应用现状.     

芦荟多糖含量测定的研究进展

本文综述了多种测定芦荟多糖含量的方法,包括分光光度法,色谱法,质谱法等.这些方法为芦荟多糖分析方法的进一步发展和应用提供了理论基础.     

无机粉体材料表面包膜研究与应用

综述了表面包膜技术在发光材料、纳米材料、珠光颜料等无机粉体材料中的研究进展。主要介绍了表面包覆无机物的研究现状 ,简要介绍了各种应用中的制备工艺 ,分析比较了各种制备工艺的优缺点及适用范围     

溴代吲哚啉螺苯并吡喃的合成及光致变色性质

合成了6,8-二溴-1',3',3'-三甲基螺([2H]苯并吡喃-2,2'-吲哚啉),用核磁共振氢谱、红外光谱、元素分析和熔点进行表征,并用X射线衍射仪进行物相分析.该化合物在丙酮中经365nm的紫外光照射,分子由闭环变成开环结构,颜色由无色变成蓝色,再用红外光照射或置于暗处,颜色变回到无色,表明目标化合物具有良好的光致变色性能.     

锂电池正极材料最新研究概况

锂电池是上个世纪70年代以后发展起来的一种新型电池,由于正极材料的发展在很大程度上决定了锂电池性能的提高,因而对于其正极材料的研究非常广泛。综述了过渡金属氧化物和有机硫化物等正极材料的电化学性能及其优缺点,并展望了锂电池正极材料的发展方向。