ATOMIC FORCE MICROSCOPY STUDIES OF POLYCAPROLACTONE RINGED SPHERULITES*

The surface morphology of free-surface PCL ringed spherulites was investigated by using atomic forcemicroscopy. The spherulites were obtained by crystallization of PCL/PVC blends of different compositions. It was found thatthe ringed spherulite exhibited regularly fluctuating rings on its surface. Compared with the bright-dark ring pattern of thespherulite under a polarizing microscope, it was proved that the optical characteristics of the ringed spherulite underpolarizing microscope coincided with its surface characteristics. The bright rings in polarizing micrographs of the spherulite coincided with the convex rings on its surface, while the dark rings coincided with the concave rings.     

Thermocontrolling ion permeation through binary component membrane composed of crown ether liquid crystal/PVC

In view of the nature of orderness in structure and the mesomorphism in property of liquid crystal, the function of which is further exploited by integrating it with the feature of crown ether. The monoarmed crown ether liquid crystals are successfully applied to the imitation of biomembrane transport. Binary component membrane composed of crown ether liquid crystal and PVC was first developed. Such a novel model of biomimetic membrane is capable of imitating ingeniously the thermocontrolling transport of biomembrane, thus the essential function of liquid crystal in membane transport is more fully exploited. It was suggested, consequently, that the molecules of the crown ether liquid crystal could assemble themselves to form ionic channels, as they exist in mesophase.Of still more significance is that the thermocontrolling transport of ions through the membrane is found to be operative selectively and the permeation of ion is under the direct influence of the thermal turmoil of the crown ether liquid cr     

新的手性配体促进的二芳基二酸和联萘酚的不对称合成

由手性配体α-D-葡萄糖衍生物5，6，7以及薄荷醇（8）和葑醇（9），经 Ulmann偶联反应得到光学活性的（R）－和（S）－6，6′－二硝基联苯－2，2′－ 二甲酸（4a),(R)-6,6′-二甲基联苯－2，2′-二甲酸（4b),(R)-1,1′－联萘－2 ，2′－二甲酸（13）。以三个手性膦酰胺16，17，18和CuCl组成的手性络合物为 催化剂，通过2－萘酚直接氧化偶联得到（S）－2，2′－联萘酚（15）。产物4， 13，15具有中等ee值的光学活性。     

助剂Cu对Ni/γ-Al2O3催化剂低温还原性能影响

制备了一系列铜质量分数不同的CuNi/γ-Al2O3催化剂，进行了TPR和XRD表征并测定了该系列催化剂对苯加氢制环己烷的催化活性。结果表明，助剂Cu的负载量对低温（160 ℃）还原后催化剂的催化活性影响很大，在铜镍原子摩尔比为1∶1时，催化剂具有较高的催化活性和稳定性；添加铜组分可促进镍在载体表面分散，使负载NiO的还原温度降低，催化活性提高。     

阳、阴、非离子表面活性剂胶束对酯碱性水解的影响

应用紫外分光光度法和热动力学方法研究了芳香酸酯和正脂肪酸酯在表面活性剂ＤＴＡＢ、ＴＴＡＢ、ＣＴＡＢ、ＳＤＳ、Ｂｒｉｊ３５、ＴｒｉｔｏｎＸ－１００胶束中的碱性水解反应。阳、阴、非离子表面活性剂胶束对酯的碱性水解均有禁阻作用。讨论了胶束对酯碱性水解禁阻作用的原因。     

526例儿童指血微量元素检测结果分析

为了解吐哈油区婴幼儿体内钙、铁、锌、铜、镁的含量,使用多通道原子吸收光谱仪对门诊体查的526例0~7岁幼儿指血检测了钙、铁、锌、铜、镁。结果表明,各个年龄组中缺铁均居第一位,缺钙居第二位,缺锌居第三位,年龄越小,这3种元素含量越低。提示婴幼儿生长发育快,易缺钙,铁,锌元素,年龄越小,越易缺乏。     

煅烧温度对TiO2/SiO2混合氧化物表面酸量的影响

采用共沉淀法制备了高钛含量的复合氧化物TiO2／SiO2．用BET、XRD、FT-IR和正胺吸附等分析手段，研究了煅烧温度对TiO2／SiO2表面酸量的影响．研究发现，随着煅烧温度的升高，TiO2／SiO2表面羟基密度、比表面积逐渐减少，TiO2晶粒尺寸变大，造成TiO2／SiO2表面酸量降低．当煅烧温度达到600℃到800℃之间，表面酸量基本不再改变．     

A Facile Synthesis of Indole-based Conjugated Derivatives

A novel synthetic method was developed for the preparation of indole-based conjugated derivatives with satisfied yields. By applying this strategy, a series of new compounds were prepared conveniently. All the obtained new indole derivatives were characterized by spectroscopic analyses, giving satisfactory data corresponding to their expected molecular structures.     

气相色谱法测定阳离子表面活性剂合成体系中脂肪烷基二甲基叔胺

选用HP-NINOWax毛细管色谱柱及氢火焰离子化检测器（FID），采用程序升温，建立了4种脂肪烷基二甲基叔胺的分析方法。结果表明，4种脂肪烷基二甲基叔胺质量浓度在0.005~1.0 g/L范围内，其峰面积与质量浓度有良好的线性关系，相关系数（R²）在0.9996以上。检出限（LODs，信噪比为3）在0.001~0.002 g/L之间，定量限（LOQs，信噪比为10）在0.003~0.005 g/L之间，回收率在90%~130%之间，相对标准偏差为1.3%~6.9%（n=6）。方法的线性范围宽、回收率高、选择性好，可用于叔胺的产品质量分析及生产过程控制分析。利用该方法对阳离子表面活性剂合成反应中十六烷基二甲基叔胺进行监测，结果很好地符合双分子亲核取代反应。该方法比滴定分析法更快速、精确，与液相色谱法相比，不需要进行柱前衍生或者使用色谱-质谱联用仪器。     

Synthesis of 2,2＇-（Substituted Arylmethylene）bis（1,6,6-trimethyl 6,7,8,9-tetrahydrophenanthro[1,2-b]furan-10,11-dione） Derivatives

The reactions of tanshinone IIA with aromatic aldehydes have been investigated and several 2, T-（substituted arylmethylene） bis （1,6,6-trimethyl-6,7,8,9-tetrahydrophenanthro[1,2-b]- furan- 10, 11-dione） derivatives were obtained,