芳杂环共轭聚合物紫外吸收光谱的递变规律

对芳杂环共轭聚合物的同系线性规律进行了探讨,提出了一种芳杂环共轭聚合物紫外吸收光谱递变规律,其表达式为：P=a b(1／n)。用芳杂环聚合物共轭体系的紫外吸收光谱实验数据对该线性规律进行了验证。结果表明,该表达式线性相关系数较徐光宪提出的线性规律公式要好,且预测芳杂环聚合物紫外吸收光谱比较准确。     

PERVAPORATION SEPARATION OF ETHANOL-WATER MIXTURES THROUGH PHOSPHATIC POLY(VINYL ALCOHOL)MEMBRANES

制备了以磷酸酯化聚乙烯醇为活性分离层的渗透汽化复合膜并用于乙醇－水混合物的分离。实验结果表明，在进料中乙醇浓度为２０～９５ｗｔ％的范围内，磷酸酯化聚乙烯醇复合膜对乙醇－水混合物中的水均具有很好的渗透选择性，而且，复合膜活性层酯化度对其分离性能具有显著的影响     

Miscibility and Crystallization of PHB/PMA Blends

BacterialPoly(5-hydroxybutyrate)(PHB)isabiodegradableandbioc0mpatiblethermo-plasticswithhighmeltingtemperatureandcrystallinity'.Theintrinsicbrittleness0fPHBpreventSitsdirectuseasac0mmoditypolymermaterial.ItisknownthatPHB,sbrittlenessisassociatedwiththecrackswithinthelargespherulitesofPHB2.Hence,itisconsideredthattopreparemiscibleblendsofPHBwithanamorph0usp0lymershouldbeago0dwaytodecreasethebrittleness0fPHBandproducePHBbasedmaterials3'4.PHBisknowntobendsciblewithPoly(vinylacetate)(P…     

STUDY ON REPRODUCTIVE ENDOCRINOLOGY OF HUMAN PLACENTA--CULTURE OF HIGHLY PURIFIED CYTOTROPHOBLAST CELL IN SERUM-FREE HORMONE SUPPLEMENTED MEDIUM

A new method of long-term culture of cytotrophoblast cells in serum-free medium has been developed. Cytotrophoblast cells were isolated with cold trypsin and purified by unit gravity sedimentation through BSA density gradients. The cells were cultured in the FD medium with supplement of EGF, insulin, transferrin and sodium selenite. They could survive over three weeks. The results showed that both EGF and insulin stimulated hCG and progesterone secretion and that sodium selenite elevated hCG output but not progesterone secretion. Transferrin produced synergistic effect with EGF and insulin on hCG and progesterone secretion but it was ineffective when used alone. This study demonstrates that the four growth factors mentioned above are essential for the survival of cytotrophoblast cells in vitro. It is therefore suggested that EGF, insulin and selenium may possibly be involved in the regulation of hCG and progesterone secretion in the human placenta.     

尖晶石锂锰氧化物电极首次脱锂过程的EIS研究

研究了尖晶石锂锰氧化物电极首次脱锂过程中的电化学阻抗特征. 通过选取适当的等效电路拟合实验所得的电化学阻抗谱数据, 获得了首次脱锂过程中固体电解质相界面膜(SEI膜)的电阻、电容以及电荷传递电阻、双电层电容等随电极极化电位的变化规律.     

PBO聚合物紫外吸收光谱中环境因素影响的理论研究

芳杂环液晶高分子聚对亚苯基苯并二噁唑（PBO, poly(p-phenylene-2,6- benzobisoxazole)）的共轭平面结构赋予其光电性能而备受关注.实验结果表明其光电性能受其所处环境状态影响. 通过量子化学计算研究发现,PBO无论固态还是溶液状态的最大紫外吸收均较其本征值有所红移.对PBO二聚体模型以及其在强质子酸中所具有的质子化形态模型的紫外吸收光谱计算模拟的结果表明,PBO聚集态时的分子间相互作用,以及溶液中质子化效应均导致红移.质子化模型所得紫外吸收光谱能很好地阐释溶液中具有精细结构实测的紫外吸收光谱.     

β-PbO2纳米棒及Pb3O4纳米晶的制备与表征

利用NaClO在碱性溶液中与Pb(Ac)2进行氧化反应直接合成出直径为10－20nm、长度为400nm、长径比达20以上的纯相β－PbO2纳米棒，对所得β－PbO2在420℃下进行热解，得到晶粒尺寸为20nm左右的Pb3O4。对液相氧化反应的温度、时间、氧化剂浓度、pH等因素的影响进行了详细研究，获得了最佳合成反应条件，所得产物利用粉末X射线衍射和透射电子显微镜分析进行了表征。     

(C_5H_9C_5H_4)_3NdBrLi(THF)_3和(C_5H_9C_5H_4)_3SmTHF的合成与结构

无水三氯化钕与环戊烷基环戊二烯钠、溴化锂(1:2:1摩尔比)反应,除去不溶物和溶剂后,产物在己烷/四氢呋喃溶剂中冷冻得到兰紫色晶体(C5H9C5H4)3NdBrLi(THF)3(配合物1)。其中心金属Nd3+的配位数为10,以η5与3个环戊二烯基相连,并通过单溴原子桥连锂原子,形成双核结构。该晶体属三斜晶系,P`1空间群。晶体学参数为a=12.048(2)、b=13.498(3)、c=13.831(3);α=104.16(3)、β=104.07(3)、γ=95.96(3); V=2083.3(7)3、Z=2、Dc=1.35Mg/m3、Mr=847.01gmol-1、F(000)=874。无水三氯化钐与环戊烷基环戊二烯钠(1:3)反应,产物在-30oC下的己烷溶剂中结晶得桔红色晶体(C5H9C5H4)3SmTHF(配合物2)。该晶体属正交晶系,Fdd2空间群。晶胞参数a=28.175(5) 、b=46.24(2)、c=9.167(4);V=11943(8)3、Z=16、Dc=1.38Mg/m3、 Mr=622.11 g·mol-1、F(000)=5136。10配位的金属Sm3+与3个环戊二烯基以η5相连,并结合一个四氢呋喃溶剂分子。     

Hydrothermal Assembly and Structural Characterization of an Octamolybdate Supported Copper(Ⅰ) Tetramer:[Cu2(1,10-phen)2(4,4'-bpy)]2[Mo8O26]·4H2O

A hydrothermal reaction of copper acetate with ammonium molybdate, 4,4'-bpy (4,4'-bipyridine) and 1,10-phen (1,10-phenanthroline) led to the formation of brown crystals of [Cu2(1,10-phen)2(4,4'-bpy)]2 [Mo8O26]@4H2O 1. Single-crystal X-ray analysis has revealed that 1 C68H56N12O30Cu4Mo8 crystallizes in the triclinic system, space group P ī with a = 11.270(3), b = 13.113(6), c = 13.906(3)A, α = 103.33(4),α = 98.54(2),β= 101.29(2)°, V = 1920.1(1)A3, Mr = 2542.9(3), Z = 1, Dc = 2.199 g/cm3, μ= 2.435 mm-1, F(000)= 1240, the final R = 0.0445, wR = 0.1082 and S = 1.021 for 5052 observed reflections with I>σ2(I).It consists of copper Ⅰ tetramer units and α-[Mo8O26]4- anions, which are further attached into a three-dimensional framework through hydrogen bonding and π-π stacking interactions.     

GaN基纳米阵列LED器件制备及发光特性

为了降低GaN材料中因应变诱导的量子斯托克斯效应,增加器件有源区内的电子-空穴波函数在实空间的交叠从而提高GaN基LEDs的发光效率,采用紫外软压印技术制备了均匀的周期性纳米柱阵列结构,结合常规LED器件微加工技术获得了In GaN/GaN基蓝光与绿光纳米阵列LED器件并对其进行了表征分析。结果表明:纳米柱阵列LED器件具有均匀的发光和稳定的光电性能。纳米结构不仅有效缓解了量子阱中的应力积累(弛豫度~70%),提高了器件的辐射复合几率和出光效率,同时结合纳米柱侧壁的化学钝化处理进一步降低了器件有源区的缺陷密度,显著降低了LED器件的漏电流(~10-7),最终提高了器件的发光效率。