铈(Ⅲ)-氨基酸二元配合物与DNA的相互作用

本文应用循环伏安法和紫外光谱法研究了铈－ 色氨酸二元配合物（Ｃｅ（Ｔｒｐ）３ （（ＮＯ３ ）３ ）和铈－ 苯丙氨酸二元配合物（Ｃｅ（Ｐｈｅ）３ （ＮＯ３）３ ）与ＤＮＡ的相互作用。发现加入ＤＮＡ后稀土配合物的循环伏安曲线的峰电流值减小,当ＤＮＡ达到一定浓度时峰电流值不再减小。稀土配合物与ＤＮＡ的混合溶液体系中ＤＮＡ和稀土配合物的紫外光谱吸收峰均呈减色效应。     

A comparison of Ce~（3＋） luminescence in X_2Z（BO_3）_2（X=Ba,Sr;Z=Ca,Mg） with relevant composition and structure

The VUV-UV spectroscopic properties of Ce3+ in Ba2Mg(BO3)2,Ba2Ca(BO3)2 and Sr2Mg(BO3)2 were compared,and the relation between the energy of the 4f→5d transition of Ce3+ and the coordination environments of substituted alkaline earth ions was discussed.The chromaticity coordinates of Ce3+ activated X2Z(BO3)2(X=Ba,Sr;Z=Ca,Mg) phosphors were changeable from blue to whitish and further to green range by varying the doping concentration of Ce3+ or the types of substituted alkaline earth ions upon 172 nm excitation.     

Er(NO3)3在DMF中无限稀释摩尔电导率的测定

在293K～313K温度范围内测定了Er(NO3)3在DMF溶剂中的电导率,根据公式λ=(k液-k剂)×10-3/C求得Er(NO3)3的摩尔电导率λ值,应用Kohlrausch经验规则λ=λ0(1-β√C)作图,使用Origin软件进行线性拟合,外推求得不同温度时Er(NO3)3在DMF溶剂中的无限稀释摩尔电导率λ0值,并讨论了Er(NO3)3溶液的无限稀释摩尔电导率与温度的关系.     

倾斜衬底上沉积的钙钛矿结构氧化物薄膜的电阻各向异性

用脉冲激光沉积法(PLD)分别在平的和倾角为10°、15°、20°的LaAlO3倾斜衬底上制备了La0 5Sr0 5CoO3薄膜和La0 67Ca0 33MnO3薄膜。用四探针法测量薄膜表面的电阻,发现平衬底上生长的薄膜没有电阻各向异性,而倾斜衬底上生长的薄膜存在电阻各向异性现象,并且倾角越大,电阻各向异性越明显。这是由于倾斜衬底上薄膜的自组织结构造成的。     

Citrate-Gel Synthesis and Luminescent Properties of α-Zn3(PO4)2 Doped with Eu3+

By using inorganic salts as raw materials and citric acid as complexing agent, α-Zn3(PO4)2 and Eu3 doped α-Zn3(PO4)2 phosphor powders were prepared by a citrate-gel process. X-ray diffraction(XRD), TG-DTA, FT-IR and luminescence excitation and emission spectra were used to characterize the resulting products. The results of XRD reveal that the powders begin to crystallize at 500 ℃ and pure α-Zn3(PO4)2 phase is obtained at 800 ℃. And the results of XRD reveal that Eu3 exists as EuPO4 in the powder. In the phosphor powders, the Eu3 shows its characteristic red-orange(592 nm, 5D0-7F1) emission and has no quenching concentration.     

Low-temperature heat capacities of crystalline Ho(Gly)_3Cl_3·3H_2O from 78 to 348 K

Heat capacities of the rare-earth complex with glycine [Ho(Gly)3Cl3·3H2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 78 to 348 K.In the experimental temperature range,the heat capacities increased in a smooth and continuous manner and no phase transition or thermal anomaly occurred.Therefore,the sample was stable in the above temperature range.The values of experimental heat capacities were fitted to a polynomial equation with least square method and ...     

Investigation on pumping oxygen characteristics of （Bi2O3）0.73（Y2O3）0.27 solid electrolyte

（Bi2O3）0.73（Y2O3）0.27 fine powders prepared by wet chemical precipitation method were cold isostatically pressed to form solid electrolyte tubes, and sintered at 900 ℃ for 10 h in the air. Their pumping oxygen characteristics in non-dehydrated Ar gas were investigated, where a ZrO2 （Y2O3 stabilized） oxygen sensor was used to measure the oxygen partial pressure Po2. The results showed that the Po2 value reached magnitudes of 1×10^-2-1×10^-10 Pa at the applied pumping oxygen voltage of 0.5 V, 1×10^-37-1×10^-27 Pa at 1.0 V and 1×10^-53-1×10^47 Pa at 2.0 V within the temperature range from 550 to 650 ℃. Moreover, no cracks were found in the tested solid electrolyte tubes. Thus, the Bi2O3-Y2O3 system might be used in solid electrolyte oxygen pump for purifying gases.     

Luminescence and Energy Transfer of Gd_xY_（1－x）P_5O_（14）：Ce，Tb──I．Preparation，Structure and Spectral Properties

ＬｕｍｉｎｅｓｃｅｎｃｅａｎｄＥｎｅｒｇｙＴｒａｎｓｆｅｒｏｆＧｄ_ｘＹ_（１－ｘ）Ｐ_５Ｏ_（１４）：Ｃｅ，Ｔｂ──Ｉ．Ｐｒｅｐａｒａｔｉｏｎ，ＳｔｒｕｃｔｕｒｅａｎｄＳｐｅｃｔｒａｌＰｒｏｐｅｒｔｉｅｓＧｕｏＣｈａｎｇｘｉｎ（郭常新）；ＢａｉＳｈａｎ...     

NH3-CO2系统中Y(OH)3完全沉淀条件的研究

Ｙ３＋在氨的水溶液中可形成Ｙ（ＯＨ）３沉淀。在该体系中通入二氧化碳气体，随终点ｐＨ的不同，体系中存在的ＨＣＯ３－、ＣＯ３２－使Ｙ（ＯＨ）３溶解为［Ｙ（ＣＯ３）ｎ］３－２ｎ或［Ｙ（ＨＣＯ３）］３－络合离子。本试验研究了体系终点ｐＨ及起始氨浓度对ＣＯ３２－、ＨＣＯ３－浓度的影响以及进而对Ｙ（ＯＨ）３沉淀率的影响，得到了使Ｙ（ＯＨ）３完全沉淀的反应条件。     

WC-20%Co添加陶瓷颗粒ZrO2的试验研究

利用热等静压真空烧结工艺制备了4种不同含量ZrO 2(3Y)的WC-20 %Co硬质合金.利用光学、扫描电子显微镜(SEM)进行了微观组织观察,并对试样进行了硬度测试、抗弯强度、冲击韧性和耐磨性的力学性能测试,试验结果表明ZrO 2(3Y)在WC-20 %Co基体中呈球形,均匀分布在Co相和WC相中,添加了ZrO 2(3Y)的WC-20 %Co的硬质合金抗弯强度和冲击韧性明显提高,耐磨性能有明显改善,硬度指标变化不大.     

Luminescence and Energy Transfer of Gd_xY_（1－x）P_5O_（14）：Ce， Tb──Ⅱ． Energy Transfer of Ce→Gd→Tb

ＬｕｍｉｎｅｓｃｅｎｃｅａｎｄＥｎｅｒｇｙＴｒａｎｓｆｅｒｏｆＧｄ_ｘＹ_（１－ｘ）Ｐ_５Ｏ_（１４）：Ｃｅ，Ｔｂ──Ⅱ．ＥｎｅｒｇｙＴｒａｎｓｆｅｒｏｆＣｅ→Ｇｄ→Ｔｂ￥ＧｕｏＣｈａｎｇｘｉｎ；ＢａｉＳｈａｎｙａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃ...     

溶胶凝胶法制备超细Li_(2 x)Sm_xSi_(1-x)O_3及其离子导电性研究

以无机盐和金属醇盐为前驱物 ,用溶胶 凝胶法制备了超细Li2 xSmxSi1-xO3(x =0～ 0 0 9) ,用DTA、XRD、TEM及交流阻抗等技术对样品的结构、形貌、粒径及离子导电性等进行了观察和测试。其固溶体形成范围是 0 相似文献   

聚砜—P_(204)支撑液膜分离稀土离子研究

本文研究了聚砜—P_(204)支撑液膜体系中稀土离子La~(3+)的传质过程,讨论了原液中La~(3+)浓度在较低和较高时La~(3+)的迁移行为,考察了原液pH值、膜相载体浓度对迁移的影响,并对实验结果进行了分析和讨论。     

Hydrothermal synthesis of Y(OH)3, Y(OH)3:Eu3+ nanotubes and the photoluminescence of Y(OH)3:Eu3+,Y2O3:Eu3+

The phase and morphology transformation during the hydrothermal treating process of Y2O3 was evaluated with X-ray diffcrcnce (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size and specific surface area determination.The results showed that the cubic Y2O3 did not transfer into hexagonal Y(OH)3 in pure water. Therefore, pure hexagonal Y(OH)3 with nanotube and microrod morphologies were obtained by hydrothermal treating Y2O3 at 150℃ for 12 h in 15 ml of 2 mol/L NaOH solution with and with-out PVA or PEG It was suggested that the characteristic preferential growth of Y(OH)3 was attributed to the structure anisotropy of hexahedron Y(OH)3. The addition of PVA or PEG could promote the forming process of nanotubes by selective adsorption on different crystal planes,which altered the growth rate along different directions and resulted in the diffusion limit of constructing ions in the center top of rods. Finally,Y(OH)3:Eu and Y2O3:Eu nanotubes were also synthesized by using this method, and their photoluminescence properties were evaluated.     

吸附胶体浮选法在含铬(Ⅵ)废水处理中的应用与评价

吸附胶体浮选法是采用FeSO4为还原剂将Cr(Ⅵ)还原成Cr(Ⅲ),用NaOH调节pH值为6左右,使生成Fe(OH)3和Cr(OH)3沉淀.然后向该溶液中加入十二烷基磺酸钠(SLS)浮选剂直接进行浮选,重金属铬离子和表面活性剂反应产物以泡沫形式去除.本次实验做了20×10-6Cr(Ⅵ)合成废水的条件实验,用正交实验法确定了50×10-6Cr(Ⅵ)合成废水的浮选最佳条件,对实际废水进行了处理,其结果达到了国家工业废水排放标准(Ce6+<0.5 mg/1)为工业上采用浮选法处理含铬废水提供了实验依据.     

Luminescence and Defect Properties of Novel Bluish-Green Phosphor β-Zn3(PO4)2∶Zr4+

Luminescence and defect properties of novel phosphor β-Zn3(PO4)2:Zr4 were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm-1. The unusual optical properties of Zr4 ion are ascribed to its uncommon coordination environment. In addition it shows intensive bluish-green long lasting phosphorescence(LLP) due to the existence of electron trap, which is generated by aliovalent substitution of Zr4 ion for the cation site in the matrix as shown in thermoluminescence(TL) spectrum.     

溶胶-凝胶法制备Li2+xPrxSi1-xO3及其离子导电性研究

采用溶胶－ 凝胶法制备了Ｌｉ２＋ ｘ ＰｒｘＳｉ１－ ｘ Ｏ３（ｘ＝ ０～０１５），用ＤＴＡ、ＸＲＤ、ＴＥＭ 及交流阻抗仪等技术对样品的结构、形貌、粒径及离子导电性等进行了观察和测试。结果表明：其固溶体形成范围是０＜ ｘ≤００９，在固溶体范围内，样品电导率随掺杂量增加而增高；平均粒径为０１５μｍ ；与传统的固相合成方法相比，该法可使样品的生成温度降低，离子导电性提高。     

Characterization of (Y,Gd)B_xV_(1-x)O_(4-x)∶Eu Phosphor Prepared by Coprecipitation Reaction

The PDP have been widely used for large flatpanel displays.Phosphors for the application in PDPare required to have high conversion efficiency by theVUVradiation of147and/or172nmfromthe Xe andXe-He gas plasma[1].In order to have a good picturequality,much attention has been paid to i mprove ordevelop novel PDP phosphors[2~6].The commercialred emitting PDP phosphor(Y,Gd)BO3∶Eu3+showsthree sharp emissions peaked at593,612and627nm,which are corresponding to the transitions of5D0→7F1,5…     

用有机酸(Ar(OH)_3COOH)从废定影液中回收银

介绍了用有机酸 (Ar(OH) 3COOH)从废定影液中还原银的方法及工艺条件。试验结果表明 ,用有机酸 (Ar(OH) 3COOH)从废定影液中还原银 ,银还原率为 99 2 0 % ,总回收率为 94 5 % ,回收的银粉 (片 )中银的质量分数为 97 43%     

La0.9Sr0.1Ga0.8Mg0.2O3-δ电解质材料的合成及性能研究

对合成La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)电解质的制备过程做了TG-DTA分析,然后采用固相法合成LSGM电解质材料。利用XRD、粒度分析、交流阻抗谱等检测技术,对LSGM电解质结构及性能进行表征。XRD分析表明,在1 000℃烧结后,粉体开始形成钙钛矿结构,随着温度的升高,粉体中杂相含量越来越少,经1 000℃和1 450℃两次烧结后,形成了单一的钙钛矿结构相;粒度分析表明,合成电解质粉体的粒径较为合理;交流阻抗谱检测表明,烧结样品具有稳定的离子电导性能,在800℃时,电导率约为1.2S/m。