Effect of Preparation Process of Functional Polymer Active Materials on Properties of Gadolinium Ion Selective Electrode

Recently we have studied the rare earth ion-selective electrodes with active materials of the func-tional polymers and found that the process chosen for the functional polymers had an effect on the propertiesof gadolinium ion selective electrode besides the effects of their structures.1.Effect of preparation process of the grafted polymers on the properties ofgadolinium ion selective electrodesThe electrode membranes which consist of functional polymers as active materials were prepared by re-action of gadolinium chloride with the radiation grafted clmer of acrlic acid and polystyrene of which

EFFECT OF STRUCTURE OF FUNCTIONAL POLYMER ACTIVE MATERIALS ON PROPERTIES OF GADOLINIUM ION SELECTIVE ELECTRODE

In this paper,the functional polymeric active materials were prepared by the grafting copolymerization and their structure and properties were studied.The results show that the structure and properties of these ac- tive materials have the relative large effects on the properties of gadolinium ion selective electrodes.

Preparation and Optical Properties of Er^(3+)-Doped Gadolinium Borosilicate Glasses

Er^(3+)-doped Gd_2O_3 -SiO_2 -B_2O_3 -Na_2O glasses were prepared, and formation range of glass of Gd_2O_3 -SiO_2 -B_2O_3 system was experimentally obtained. It is found that the glass phase can be formed only when the content of SiO_2 is 0～50%(molar fraction), Gd_2O_3 is 0～30%(molar fraction) and B_2O_3 is above 20%(molar fraction) in this glass system. The glass can also be obtained but becomes translucent at the contents of 60%(molar fraction) SiO_2 and 30% Gd_2O_3 , or at the contents of 60%(molar fraction) SiO_2 and 30%(molar fraction) B_2O_3. There is no glass phase formed in other glass components. Glass forming ability for Gd_2O_3 content of 10%, was characterized by the value of β, the parameter of crystallization tendency, which is 0.32～1.76, obtained from the differential thermal analysis. The absorption and emission cross section, the J-O parameters Ωt_((2,4,6)) and radiative transition probabilities were calculated by using the theory of McCumber and Judd-Ofelt. The emission properties at 1.5 μm of the samples are discussed with the product of full width at half maximum and stimulated emission cross section. It can be seen that the value of the FWHM×σ_e^(peak) product in the prepared glass is more than those of germanate, silicate and phosphate glasses. Furthermore, the maximum value of the product among these glasses reported in this work is close to that of oxyfluoride silicate glass. Therefore, the Er^(3+)-doped gadolinium borosilicate glass in this paper is a candidate for broadband erbium doped fiber amplifiers.

Sorption of Gadolinium (III) Ions by a Natural Clinoptilolite-Containing Tuff

The equilibrium and kinetics of sorption of gadolinium (III) ions from sulfate solutions by a natural clinoptilolite containing tuff are studied. It is shown that gadolinium is completely extracted from dilute solutions (0.002 M). The kinetic parameters of the sorption process are determined.

微波法合成橙红色长余辉磷光粉Gd_2O_2S:Sm^(3+)

首次采用微波法合成橙红色长余辉磷光粉:Gd2O2S:Sm3+,并表征了其结构,激发、发射光谱和余辉衰减曲线.XRD分析证实其为单相的硫氧化钆.光致发光光谱显示Sm3+的3个特征发射(4G5/2→6HJ,J=5/2,7/2,9/2).该磷光粉经紫外和可见光激发后呈现出长时间明亮的余辉发射,是一种性能良好的新型长余辉发光材料.

Er^(3+),Ho^(3+)和Tm^(3+)在硫氧化钆中的余辉发光

The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. The excitation and photoluminescence spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S∶Er3+, Mg, Ti showed typical transitions of Er3+ at 528 (2H11/2 → 4I15/2),548 (4S3/2 → 4I15/2) and 669 nm (4F9/2 → 4I15/2). In the afterglow spectra of Gd2O2S∶ Ho3+, Mg, Ti, typical transitions of Ho3+ at 546 nm (5S2 → 5I8), 651 and 661 nm (5F5 → 5I8) were observed. In Gd2O2S∶Tm3+, Mg, Ti, the afterglow emission at 800 nm (1G4 → 3H5) of Tm3+ was seen. The mechnism and model of afterglow energy transfer were proposed.

Sm^(3+)和Gd^(3+)共掺杂TiO_2粉体的制备和性能表征

采用溶胶-凝胶法制备了纯TiO2,1%Sm3+或2%Gd3+单掺杂和1%Sm3+/2%Gd3+共掺杂TiO2复合粉体,采用XRD和SEM/EDAX等技术进行表征。以对亚甲基蓝的光催化降解为目标反应,评价了TiO2复合粉体的光催化活性,探讨了Sm3+/Gd3+共掺杂、亚甲基蓝初始浓度和粉体投加量对TiO2粉体光催化活性的影响机制。结果表明,Sm3+/Gd3+共掺杂可以显著提高TiO2粉体的光催化活性;Sm3+/Gd3+共掺杂在TiO2粉体中产生协同作用,抑制了TiO2由锐钛矿相向金红石相转变,使TiO2粒径尺寸减小,增大了TiO2的晶格畸变。当亚甲基蓝初始浓度为4mg/L和粉体投加量为2g/L时,TiO2复合粉体的光催化活性最高,对亚甲基蓝光催化降解率达99.71%;降解亚甲基蓝反应符合Langmuir-Hinshelwood动力学方程。

Sm^(3+)在玻璃中的发光以及Sb^(6+)、Ce^(6+)、Gd^(3+)对Sm^(3+)发光性质的影响

本文研究了单掺(Sm^(3+),Ce^(3+)、Gd^(3+).Sb^(3+)、双掺(Sm^(3+)+Ce^(3+)、Sm^(3+)+Gd^(3+),Sm^(3+)+Sb^(3+))和兰掺(Sm^(3+)+Gd^(3+)+Ce^(3+))约四十余种不同玻璃的发射谱和激发谱.探讨了玻璃成份和掺杂离子浓度对Sm^(3+)发光性质的影响以及Ce^(3+),Gd^(3+)、Sb^(3+)、Ce^(3+)+Gd^(3+)对Sm^(3+)的敏化作用。

Gd_(1-x)Al_yO_z:Eu_x梯度组合芯片的组织结构和发光性能

将组合材料芯片技术用于Gd1-xAlyOz:Eux荧光材料的研究。通过离子束溅射沉积和两步热处理技术制备Gd1-xAlyOz:Eux梯度组合材料芯片。通过X射线衍射和扫描电镜二次电子像分析发现:根据钆铝配比的不同在组合材料芯片上形成了相应的钆铝酸盐晶相;Gd4Al2O9(GAM)和GdAlO3(GAP)作为Gd2O3-Al2O3中的稳定晶体相,其单相多晶薄膜较容易形成。紫外激发发光照相记录表明Gd1-xAlyOz:Eux可以发射明亮的红色荧光(Eu3+的5D0–7F2发射,主峰值615nm),且对于Eu3+掺杂,GAP是最好的钆铝酸盐基体相。材料芯片的照相筛选结果和发射光谱、吸收光谱的分析结果一致。

Effects of gadolinium on proliferation, differentiation and calcification of primary mouse osteoblasts in vitro

To evaluate the effects of Gd on proliferation, differentiation and mineralization function of primary osteoblasts （OBs） in vitro, we tested cell viability by the 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyl tetrazolium bromide （MTT） assay, cell differentiation by alkaline phos- phatase （ALP） activity assay, synthesis of type I collagen, and oil red O and alizarin red S （ARS） stain assays. The results indicated that effects of Gd on the proliferation, osteogenic differentiation, mineralization function and adipocytic transdifferentiation of primary OBs de- pended on concentration and incubation time, but were not dose-dependent. It was suggested that the effect of Gd on bone metabolism was complicated, and concentration and culture time were key factors for switching the biological effects of Gd from damage to protection.

新型掺铒钆硼硅酸盐玻璃的制备和光学性质的研究

用高温熔融法制备了成分为Gd2O3,SiO2,B2O3和Na2O的新型玻璃体系,探索了该玻璃体系的成玻范围,发现该系统在B2O3:20%以上,SiO2:0～50%,Gd2O3:0～30%的范围内均可形成完全透明的玻璃。在Gd2O3:30%,B2O3:60%和SiO2:60%,B2O3:30%两个组分附近时玻璃轻微失透。除此以外,在其他组分实验上没有得到玻璃。根据差热分析的数据,计算得到的玻璃析晶倾向参数β在0.32～1.76之间,说明含10%Gd2O3的钆硼硅酸盐玻璃具有较强的形成能力;利用McCumber理论计算出样品的吸收和受激发射截面,并从玻璃1.5μm的吸收光谱出发拟合出了J O参数,进而计算了Er3+离子各相关能级的理论振子强度、实验振子强度和自发辐射速率等参数。同时,用Er3+离子1 5μm发射光谱的半高全宽与其峰值发射截面的乘积值对含10%Gd2O3钆硼硅酸盐玻璃1.5μm发射的增益带宽作出了表征,结果表明,含10%Gd2O3玻璃体系的FWHM×σepeak值均大于已有报道的硅酸盐、磷酸盐和锗酸盐玻璃,其中最大值和氧氟硅酸盐玻璃的相差不多。

稀土掺杂钨酸钆钾激光晶体生长

以K_2W_2O_7为助溶剂,在钨酸钆钾[KGd(WO_4)_2,KGW]晶体中分别掺入稀土元素离子Nd^(3+),Yb^(3+),Er^(3+)和Er^(3+)+Yb^(3+),用顶部籽晶提拉法分别生长出Nd∶KGW,Yb∶KGW,Er∶KGW和Er∶Yb∶KGW4种激光晶体。获得最佳的生长工艺参数是:转速为10~15r/min,拉速为1~2mm/d,降温速率为0.05~0.1℃/h,生长周期为10~15d。经X射线分析确定4种晶体均为β相。利用热重差热分析确定了晶体的熔点和相转变温度,结果表明:Nd∶KGW,Yb∶KGW,Er∶KGW和Er∶Yb∶KGW4种晶体的熔点分别为1085,1086,1080℃和1079℃;相转变温度分别为1023,1021,1021℃和1024℃。分析了晶体产生缺陷的原因。

硝酸钆丙氨酸配合物的合成及其配离子的标准生成焓

合成了硝酸钆与丙氨酸的稀土氨基酸配合物Gd(Ala) 4(NO3 ) 3 ·H2 O(s) .采用具有恒温环境的反应热量计 ,测定了Gd(Ala) 4(NO3 ) 3 ·H2 O(s)在水中的溶解焓 ,并计算出配离子Gd(Ala) 3 +4 在 2 98.2K时的标准生成焓ΔfHθm [Gd(Ala) 3 +4 ,aq ,2 98.2K]=- 2 95 6 .1kJ·mol- 1 .

离子束外延制备GaAs:Gd薄膜

室温条件下,用低能离子束外延制备了GaAs∶Gd薄膜,X射线衍射(XRD)结果表明除了GaAs衬底峰没有发现其它新相的衍射峰,并借助于高分辨X射线衍射(HR XRD)进一步分析了晶格常数的变化特点。俄歇电子能谱(AES)分析了样品表面的成分,及元素随深度的分布规律,在60nm深处元素的相对含量发生明显改变,运用原子力显微镜(AFM)揭示了样品表面的形貌特点。

Gd^(3+)为敏化剂的掺Tb^(3+)硅酸盐闪烁玻璃

实验制备了以Tb3+为激活剂、Gd3+为敏化剂的硅酸盐闪烁玻璃,研究了Tb2O3和Gd2O3含量对玻璃密度和玻璃折射率,以及对玻璃在紫外光激发和X射线激发条件下的光学光谱特性的影响.通过研究Tb3+/Gd3+共掺闪烁玻璃的激发与发光特性、荧光寿命,结合稀土离子能级结构,分析了Gd3+→Tb3+离子之间的能量转移与传递机制.结果表明:在紫外激发条件下,大量引入Tb2O3和Gd2O3可提高Gd3+→Tb3+离子之间的能量传递效率,有利于Tb3+离子的绿色发光;但是在X射线激发条件下大量引入Tb3+离子,由于缺陷数增加而弱化Tb3+离子荧光.

GdVO_(4)∶Bi^(3+)纳米晶的水热制备及其超宽光致发光研究

以柠檬酸钠为络合剂和封端剂,采用水热法制备GdVO_(4)∶x%Bi^(3+)荧光粉,其中x=0.1%,0.3%,0.5%,1%,3%和5%,随后将所制备的荧光粉置于马弗炉中600℃退火2h。XRD以及TEM的分析结果表明所制备的荧光粉为四方相,且具有较好分散性。在276 nm的紫外光激发下,GdVO_(4)∶x%Bi^(3+)体现出紫外到可见(300~750 nm)的超宽光致发光。基于发射光谱可见,Bi^(3+)最佳掺杂浓度为1%,由此得到能量传递的临界距离Rc。基于CIE坐标图可见所制备的荧光粉基本体现出绿光发射。

离子束淀积方法制备GdSi_2薄膜

采用离子束淀积方法制备了单相 Gd Si2 薄膜 .用俄歇电子谱仪对样品的成分进行了分析 ,用 X射线衍射方法分析了样品的结构 ,并用扫描电子显微镜观察了样品的表面形貌 .X射线衍射分析发现在 4 0 0℃沉积的样品中仅存在正交的 Gd Si2 相 .样品在氩气氛中 35 0℃ ,30 m in退火处理后 ,Gd Si2 相衍射峰的半高宽变窄 ,说明经过退火处理 ,Gd Si2

微波水热法制备Gd^(3+)掺杂的碳量子点型高性能磁共振-荧光双模态分子影像探针

以同时提供钆源和碳源的钆喷酸单葡甲胺为前驱体,利用微波作为加热手段实现分子水平上的搅拌,达到低温、短时间内制得均匀的小粒度Gd3+掺杂碳量子点(Gd3+/CQDs-MH)的目的。当前驱体在250℃下微波水热反应45 min时,获得的Gd3+/CQDs-MH表现出较高的量子产率和极强的磁共振性能,避免了传统加热方式对碳量子点的发光能力和弛豫性能极难同时提高的矛盾。该条件下合成出尺寸约1.0 nm的碳量子点,其荧光量子产率为11.0%,Gd3+的掺杂质量分数达16.9%,纵向弛豫性能高达4 545.3 mmol-1·L·s-1([Gd3+]=0.01 mmol·L-1)。并且,该碳量子点对He La细胞无明显毒性,有望用作高弛豫性能和高发光性能的磁共振-荧光双模态探针。

Eu^(3+)掺杂Gd_2(WO_4)_3荧光材料的合成及性能研究

以钨酸钠溶液和稀土硝酸盐溶液为原料,采用水热法合成技术制备前驱体颗粒,经后续900℃煅烧能够获得结晶性良好、分散性良好的Gd2-xEux(WO4)3荧光颗粒,在此基础上,采用XRD、PLE/PL对材料的合成及荧光性能等进行一系列表征。分析结果表明:Eu3+的掺杂并未改变钨酸钆的结构,在246 nm W-O电荷迁移带(CTB)的激发下,Gd2-xEux(WO4)3荧光粉于617 nm(Eu3+的5D0→7F2)处呈现优异的红光发射,并得到Gd2(WO4)3:Eu3+的猝灭浓度为30at%,与理论计算值一致。

稀土钆、钇掺杂LiFePO_4正极材料的制备及电化学性能测试

通过水热法制备了稀土钆、钇离子掺杂的LiFe_(1-x)Gd_xPO_4、LiFe_(1-x)Y_xPO_4(x=0,0.01,0.03,0.05)锂离子电池正极材料,通过X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)等方法表征,对电池进行恒流充放电、交流阻抗(EIS)、循环伏安(CV)电化学测试,系统的研究了LiFePO_4微观结构及电化学性能。结果表明,通过水热法制备的少量稀土掺杂的磷酸铁锂正极材料仍然是橄榄石结构,颗粒尺寸300~800 nm,一定程度上细化颗粒有效的减小Li^+的扩散和迁移途径,增加了Li^+的占位无序度,使得锂离子脱嵌变得容易,改善了材料的电导性,使LiFePO_4正极材料放电比容量增加,循环稳定性能提高。在电位范围2.0~4.2 V之间,样品随着掺杂量的增加,初始放电比容量首先升高然后下降,其中LiFe_(0.97)Gd_(0.03)PO_4初始放电率达到143.38 m Ah/g,LiFe_(0.97)Y_(0.03)PO_4初始放电率达到148.35 m Ah/g,和空白样比提高了近45%,且EIS和CV测试结果进一步验证了LiFe_(0.97)Gd_(0.03)PO_4、LiFe_(0.97)Y_(0.03)PO_4样品具有最佳的电化学性能。