Luminescence Properties of Rare Earth Ions in Cadmium Metasilicate

The luminescence properties of CdSiO3:RE^3 phosphors doped with various rare earth ions are reported. The series of rare earth ions doped CdSiO3 phosphors are prepared by the conventional high-temperature solid-state method, and characterized by XRD and photoluminescence (PL) spectra. The results of XRD measurement indicate that the products fired under 1050 ~C for 3 h have a good crystallization without any detectable amount of impure phase. The PL spectra measurement results show that CdSiO3 is a novel self-activated luminescent matrix. When rare earth ions such as Y^3 ,La^3 , Gd^3 , Lu^3 , Ce^3 , Nd^3 , Ho^3 , Er^3 , Tm^3 and Yb^3 are introduced into the CdSiO3 host, one broadband centered at about 420 nm resulted from traps can be observed. In the case of other earth ions which show emissions at the visible spectrum region, such as Pr^3 , Sm^3 , Eu^3 , Tb^3 and Dy3 , the mixture of their characteristic line emissions with the ～420 nm strong broadband luminescence results in various emitting colors. As a consequence, different emitting colors can be attairied via introducing certain appropriate active ions into the CdSiO3 matrix. In additional, this kind of phosphors shows good long-lasting properties when excited by UV light. All the results show that CdSiO3 is a potential luminance matrix.     

铝阳极氧化多孔膜的制备和应用研究

介绍了以高纯铝为原料采用二次阳极氧化技术制备铝阳极氧化多孔膜的工艺条件，并对以其作为功能膜进行模板组装方面的应用作了研究。     

Hydrothermal synthesis and crystal structure study of two novel 3-D mellitates {Nd2[C6（COO）6] （H2O）6} and {Ho2[C6（COO）6]（H2O）6}

Two novel 3-D coordination compounds, Nd2[C6（COO）6]（H2O）6 （1）and Ho2[C6（COO）6]（H2O）6 （2）, were hydrothermaily synthesized from mellitic acid and neodymium perchlorate （or holmium perchlorate） in the alkaline aqueous solution and characterized with elemental analysis, TG, IR spectrum, and single crystal X-ray diffraction. The two compounds were isostructural and crystallized in the orthorhombic system, space group Pnnm, with a=1.3531 （4） nm, b=0.6687 （2） nm, c=1.0224（3） nm, V=0.92523（5） nm^3, Z=4, D=2.630 g/cm^3, F（000）=696.0, Goof=1.052. Final R indices [1 〉2∑（Ⅰ）]： R1=0.0195, wR2=0.0382 for 1; a=1.3411 （2） nm, b=0.6586（1） nm, c=1.0116（2） nm, V=0.8935（3） nm^3, Z=4, D=2.877 g/cm^3, F（000）=724.0, Goof=1.061. Final R indices [1 〉2∑（Ⅰ）]： R1=0.0200, wR2=0.0479 for 2. In the two compounds 1 and 2, the mellitic acid ligand, in which all the carboxylate groups were deprotonated, had only one kind of coordination mode to bridge metal ions to form four-connected three-dimensional diamondiod networks.     

TiO2改性多功能涂料的制备及性能研究

将实验室自制的纳米TiO2添加于丙烯酸-有机硅乳液中,利用TiO2的光催化活性,制成多功能涂料。实验结果表明,该涂料具有抗污自洁净、抗菌防霉等功能,光催化作用持久,抗光氧化能力良好。     

纳米SiO_2/Au复合粒子的制备及其性质表征

通过改进的方法制备了金壳包覆二氧化硅纳米复合粒子. 二氧化硅和金纳米粒子分别通过Stober法和化学还原法制备. SEM分析表明, 都呈现出单分散的球状分布, 粒径为300和100 nm左右. 制备的纳米复合粒子通过TEM, UV-Vis-Near-IR, FTIR来表征和研究, 结果表明结合柠檬酸钠与硼氢化钾还原法制备所得到的SiO_2/Au复合粒子表层光滑, 完整, 没有团聚现象. SiO_2/Au-3的光学共振峰比SiO_2/Au-1和SiO_2/Au-2有红移. 傅立叶红外光谱研究表明形成SiO_2/Au核-壳结构后, Si-O-Si和Si-OH的键会明显减弱.     

硅酸盐体系长余辉发光材料的研究进展

硅酸盐体系长余辉发光材料因具有优异的发光性能而成为一类重要的能源材料和节能材料.综述了硅酸盐体系长余辉发光材料的研究进展,指出了它的特点和优势,总结了它的制备方法,概括了长余辉发光模型,并提出了今后研究和应用的方向.     

Synthesis of ordered mesoporous γ-Al_2O_3:Eu~(3+) with high luminous performance and thermal stability

An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu3+. Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms and transmission electron microscopy (TEM). The as-synthesized γ-aluminas...     

Structure and antibacterial activity of new layered perovskite compounds

New layered perovskite compounds, AgxNa（2-x）La2Ti3O10（x=0.2, 0.3 and 0.5） were synthesized by an ion-exchange reaction of Na2La2Ti3O10 with AgNO3 solution and characterized by energy dispersive X-ray analysis（EDX）, X-ray diffractometly（XRD）, scanning electron microscopy（SEM） and X-ray photoelectron spectroscopy（XPS）. The ion-exchange processes were optimized, and the antibacterial activity, light permanency and water-resistance were evaluated. Surprisedly, no significant changes in crystal structure of Na2La2Ti3O10 are found by the exchange of silver ions. The Ago.3Na1.7La2Ti3O10 particles conglomerate obviously with irregular shape and size. Ago.3Na1.7La2Ti3O10, possessing the minimum inhibitory concentrations（MICs） against Escherichia coli （E. coli）, Staphylococcus aureus （S. aureus） of 180 mg/L and 240 mg/L, has high antibacterial activity, good light permanency and water-resistance. The ionic state silver in AgxNa（2-x）La2Ti3O10 is the antibacterial active component.     

溶剂热还原法制备棒状LaNiC2

以纳米镧镍氧化物前驱体和甲苯为反应物,氢化钙为还原剂,在不锈钢反应釜中于600℃溶剂热条件下成功地合成了棒状LaNiC2。运用XRD,TEM和SEM等对样品的结构和微观形貌进行了分析,并对样品进行了磁性测试。实验结果表明,此方法合成的LaNiC2材料呈棒状、具有铁磁性,同时该法具有简便易行、反应条件温和以及能耗低等优点。     

还原扩散法直接制备AB5型多元贮氢合金

采用CaH2作为还原剂,稀土氧化物以及其它金属氧化物为原料,直接通过还原扩散反应成功制得了多元贮氢合金La0.4Ce0.1Nd0.2Pr0.3Ni3.55Co0.75Mn0.4Al0.3。