金属铕制备工艺的研究

本文采用正交实验的方法,研究了金属铕的制备工艺条件。实验结果表明,还原－蒸馏温度１１００℃,还原剂过量系数０．３,保温时间１．５小时,金属铕的纯度大于９９．９％,直收率大于９０％     

溶胶-凝胶法合成Y_2O_3-SiO_2∶Eu~(3 ),Bi_(3 )发光体及发光特性研究

采用溶胶－ 凝胶法低温合成了Ｙ２Ｏ３ － ＳｉＯ２ ∶Ｅｕ３＋ ,Ｂｉ３＋ 发光体,研究了烧结温度、Ｅｕ３＋ 及Ｂｉ３＋ 浓度、Ｙ２ Ｏ３ 与ＳｉＯ２ 的配比对发光强度的影响。通过Ｘ射线粉末衍射、热重及差热分析,研究了由凝胶至发光晶体的转变,通过激发光谱和发光光谱的测试,讨论了材料的发光特性及Ｂｉ３＋ 对Ｅｕ３＋ 的敏化作用。     

红外光谱研究铕改性Mo/HZSM-5催化剂的表面酸性

采用红外光谱方法考察了催化剂样品中的探针分子吡啶在程序升温脱附过程中的谱图变化,将红外光谱的特征峰强度与样品温度进行关联,并进行微分处理。从而得知铕增强了Ｍｏ／ＨＺＳＭ－ ５ 催化剂的Ｂ 酸强度,而对Ｌ 酸强度无影响。     

Nanoparticle-Aided Detection of Colorectal Cancer-Associated Glycoconjugates of Extracellular Vesicles in Human Serum

Extracellular vesicles (EVs) are found in all biological fluids, providing potential for the identification of disease biomarkers such as colorectal cancer (CRC). EVs are heavily glycosylated with specific glycoconjugates such as tetraspanins, integrins, and mucins, reflecting the characteristics of the original cell offering valuable targets for detection of CRC. We report here on europium-nanoparticle (EuNP)-based assay to detect and characterize different surface glycoconjugates of EVs without extensive purification steps from five different CRC and the HEK 293 cell lines. The promising EVs candidates from cell culture were clinically evaluated on small panel of serum samples including early-stage (n = 11) and late-stage (n = 11) CRC patients, benign condition (n = 11), and healthy control (n = 10). The majority of CRC cell lines expressed tetraspanin sub-population and glycovariants of integrins and conventional tumor markers. The subpopulation of CD151 having CD63 expression (CD151^CD63) was significantly (p = 0.001) elevated in early-stage CRC (8 out of 11) without detecting any benign and late-stage samples, while conventional CEA detected mostly late-stage CRC (p = 0.045) and with only four early-stage cases. The other glycovariant assays such as CEA^Con-A, CA125^WGA, CA 19.9^Ma696, and CA 19.9^Con-A further provided some complementation to the CD151^CD63 assay. These results indicate the potential application of CD151^CD63 assay for early detection of CRC patients in human serum.     

透明阻光薄膜对固体饮料变色的影响

制备了稀土铕转光剂添加量分别为0.2%,0.5%,1.3%和2.0%(质量分数)的LDPE转光膜,测定了其在200～800 nm区间内的透射光谱。将LDPE转光膜用于橙味固体饮料的包装,并置于UV灯下进行照射,观察了其颜色变化。以橙味固体饮料的吸光度值作为变色指标,得到了吸光度值与UV灯光照时间的变化关系。结果表明,稀土铕转光剂添加量为1.3%的透明LDPE转光膜可作为该产品的包装材料,可使其颜色保持的时间最长。     

铕配合物的合成及其荧光防伪油墨的制备

选用苯甲酸(BA)、噻吩甲酰三氟丙酮(TTA)、邻菲咯啉(Phen)作为配体合成了Eu(BA)3Phen三元配合物、Eu(BA)(TTA)2Phen四元配合物,将其作为荧光剂,制备了稀土荧光防伪油墨。红外光谱的分析表明配体与铕离子发生了配位。测定了配合物和荧光防伪油墨的荧光性能,发射波长为614 nm,制备的稀土荧光防伪油墨在可见光下印迹无色,在紫外灯下呈现明显红色荧光。     

锑,铕,铈,铒同位素丰度和原子量测量

用已知化学纯度的两种浓缩同位素通过化学计量,配制人工合成样品,用来测量质谱计系统误差校正系数,校正用该仪器测量的来自地球不同地域矿样和试剂样品中锑（Ｓｂ）、铕（Ｅｕ）、铈（Ｃｅ）、铒（Ｅｒ）四种元素天然同位素丰度比,求出这些元素同位素丰度的真值。用该真值和已知的上述四元素核素质量,计算得原子量分别为１２１．７５９７（７）Ｓｂ、１５１．９６４４（９）Ｅｕ、１４０．１１５７（８）Ｃｅ、１６７．２５９１（９）Ｅｒ     

溶胶-凝胶法制备的BaMgAl10O17:Eu前驱体的晶化过程

采用柠檬酸作为螯合物的溶胶-凝胶法制备了BaMgAl10O17：Eu(barium magnesium aluminate,BAM)蓝色荧光粉,并研究了,其晶化过程。通过X射线衍射、扫描电镜和荧光光谱等表征手段,研究了前驱体晶化过程的焙烧条件、结晶动力学、颗粒大小和发光性能等。BAM晶相在1100℃开始产生。温度达1200℃时,前驱体由无定型态完全转变成BAM晶相。在1120～1300℃时晶化反应的表观活化能为233kJ／mol。在室温下测得荧光粉的最大吸收峰和发射峰分别处在334nm和454nm。合成荧光粉的粒径为5μm左右,其形态和粒径取决于前驱体。     

模板导向低温合成固体发光材料Y2O3:Eu3+、Am+、Bn+的研究

本文采用模板导向的方法,添加合适模板剂降低灼烧温度,合成橙红色荧光体。研究离子掺杂的荧光体Y2O3：Eu^3 A^m 、B^n 的荧光性质。发射光谱数据表明：杂质离子掺杂的荧光体Y2O3：Eu^3 A^m 、B^n 的荧光发射主峰与荧光体Y2O3：Eu^3 的荧光发射主峰(612nm)一致,为经典Eu^3 的^3D0-^7F2电偶极跃迁;杂质离子的引入明显地增强了Y2O3：Eu^3 的发光强度,并且有短时间余晖存在。     

Intracellular behaviour of samarium and europium in lactating mammary gland

The subcellular localization of samarium and europium, two rare-earths, increasingly used in both medical and industrial fields, has been studied in several organs such as liver and kidney but never in the mammary gland despite of its importance in the biology of lactation and nutrition domains. The intracellular behaviour of samarium and europium after their intra-peritoneal administration in the lactating mammary gland cells was investigated. The results showed the presence of very electron dense deposits in the glandular epithelial cell lysosomes. These particular lysosomes were never observed in the mammary cell lysosomes of control rats. These intralysosomal deposits were probably composed of insoluble samarium or europium phosphates by analogy with previous studies, the transmission electron microscopy, the ion mass microscopy and the electron probe microanalysis, and other techniques allowing the identification of the chemical structure of the intralysosomal deposits.