WATER STATES IN SBR BASED WATER SWELLING RUBBER

Water swelling rubber (WSR) was prepared by reaction blending SBR andsodium polyacrylate (PAANa). The existing states of water in the WSR was studied bymeans of DSC and TG. It was found that water exists in three states: nonfreezing water,bound freezable water and free water. The relationships between water states and structureof PAANa were investigated. The results showed that the amount of non-freezing waterwas related to total water content, and the ratio of non-freezing water versus -COONagroups on PAANa (mol/mol) was about 4. However, total water content slightly affectedthe content of bound freezable water and remarkably affected the amount of free waer.     

苯乙烯基氮氧杂芳烃间的交叉光二聚反应

用中压汞灯(λ > 300 nm)照射4-苯乙烯基吡啶、2-苯乙烯基苯并噁唑和5-苯基-2-苯乙烯基噁唑三种杂芳基乙烯单体中任意两种的硫酸水溶液，得到三种交叉二聚体.用高效液相色谱跟踪研究了交叉光二聚反应，发现每组反应生成三种光二聚体，其中二种为单体自身的光二聚体，而另外一种是两种不同单体的交叉光二聚体.交叉二聚体通过柱色谱分离得到，其顺式头对尾结构经紫外、红外、氢谱、碳谱和元素分析确定.用紫外光谱和高效液相色谱跟踪研究了交叉光二聚体的稀溶液在低压汞灯（λmax=254 nm）照射下的光解反应.研究发现交叉二聚体能够彻底发生光解，首先生成原来的反式单体，所生成的反式单体容易发生异构化而生成顺式单体，最终建立起反顺异构化平衡.     

FIA-ICP/AES法分析茶叶浸取液中多元素的形态

本文报道了分析茶叶浸取液中[Zn、Mn、Fe、Al及Mg]形态的新方法。研究了以C-18柱为分离柱的流动注射与ICP/AES的联用技术。     

三硒化二铒Er_2Se_3的合成与结构

采用高温固相反应和化学气相传输法合成三硒化二铒。晶体属于四方晶系，Ｍ_ｒ＝５７１．４０，空间群为Ｐ４／ｎｍｍ，ａ＝３．９８４（１），ｃ＝８．２２８（３），Ｖ＝１３０．５９（７），Ｚ＝１，Ｄ_ｃ＝７，２７ｇ／ｃｍ￣３，Ｆ（０００）＝２３８，μ（ＭｏＫα）＝５２８．８６ｃｍ￣（－１），对于１８７个Ｉ≥３σ（Ｉ）的独立衍射点，最后偏离因子Ｒ＝０．０６６，Ｒ_ｗ＝０．０７８。化合物Ｅｒ_２Ｓｅ_３的晶体结构是由Ｅｒ配位多面体的双层状结构通过共用Ｓｅ（２）原子，沿ｃ轴方向堆积而形成的三维结构。     

Effects of various donor: acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions

In this work, the donor:acceptor ratio effected photophysical properties of non-fullerene organic solar cells are comparatively investigated. Effective transportation of the photo-generated charge carriers can be obtained with the PDBD-T:ITIC ratio variation. There is no significant energy loss variation exists in the process of changing the D:A ratio.     

CAHN－2000磁天平的调试与数据处理系统的研制

叙述了ＣＡＨＮ－２０００磁天平（美国）调试过程中如何解决液氮温区的测试，自制了磁天平与计算机的接口，编写了数据采集、处理和控制等高原 软件，节省了几万美元，部分指标超过原配套水平，三年来仪器在对国同外开放过程中，液氮温区的工作一直正常，实测了上千个样品，提供的数据已撰写数十篇文章在国内外刊物上发表。由此说明，要充分发挥进口仪器的使用效率，必须对仪器的工作原理、结构特点有透乇的了解，同时要有相当的自     

纳米荧光小球标记在蛋白质微阵列检测中的应用研究

研究了不经分离、一次性制备氨基化联吡啶钌掺杂的双层二氧化硅纳米小球的方法。实验证明该纳米小球尺寸均匀,光稳定性、水溶性好,分散稳定。通过简单的偶联反应后,它能有效的和蛋白质结合,结合后的蛋白能保持其生物活性。以此纳米荧光小球为标记物,应用于蛋白质微阵列的定量检测,结果发现其效果明显优于相同条件下以异硫氰酸荧光素(FITC)为标记物的定量结果,检出限可以达到3.5 mg/L。     

Preliminary study of trace elements in human brain tumor tissues by instrumental neutron activation analysis

Elemental profiles of brain tumor tissues from 15 patients of astrocytomas (grade I–III) and normal human brain tissues of 23 male age matched autopsies as controls have been studied by instrumental neutron activation analysis. The SLOWPOKE reactor with a thermal neutron flux of 8·10¹¹n·cm^–2·s^–1 and swimming pool type reactor with a thermal neutron flux of 1·10¹³n·cm^–2·s^–1 were used for short and long irradiation of samples, respectively. Spectrophotometry was only used for analyzing phosphorus. A total of 18 elements Se, Na, K, Br, Cl, Mn, Mg, S, Ca, Cu, Hg, Cr, Fe, Rb, Zn, Co, Sc and P has been determined for this purpose. The reliability of methods has been checked by analyzing biological standard reference materials horse kidney (IAEA H-8) and bovine liver (NBS SRM 1577a). The analytical results showed that compared with the normal brain tissues, concentrations of Ca, Fe, Cu, Zn, Se, Mn, Br and Sc were significantly higher in tumor tissues (P<0.01) and concentrations of Rb, K and P were lower, while no differences for contents of Mg, S, Cr, Hg, Na and Cl were observed. A negative correlation between P and Ca in malignant and normal brain tissues was observed.     

测定核黄素的化学发光新方法

研究了核黄素的化学发光性质，建立了一种测定核黄素的化学发光新方法，并应用于实际样品中核黄素的测定，与文献相比，本方法无需避光，而且分析体系和样品处理简单；干扰小，牛血清白蛋白、抗坏血酸、天冬氨酸等８种生物有机物质和 Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）、Ｆｅ（Ⅲ）等１５种常见金属离子的允许量较大；核黄素溶液浓度在０． １０～５０ ｍｇ／Ｌ范围内，与化学发光强度成正比，方法线性范围宽；测定１．０ｍｇ／Ｌ核黄素溶液１２次，求得相对标准偏差为２．９％，方法精密度高；方法的检测限为０．０７５ ｍｇ／Ｌ，灵敏度高。     

蔥与菲的激发等离子体质谱的分析和比较

蒽和菲是一对同分异构体,由于它们的结构都很稳定,所以在常规的电子轰击质谱中,它们的分子离子峰都很突出,两者的谱图没有明显的差异,不能成为一种鉴别手段.我们最近在自制的仪器上,记录了以近红外激光作用于这两个稠环芳香烃所产生的正负离子质谱,两者的谱图具有明显的不同,其中包含了较为丰富的结构信息,显示了这一研究手段的结构分析能力。