GC/MS SIM法快速测定酒中的游离脂肪酸

本文介绍一种简单、快速、灵敏、直接分析酒中游离脂肪酸的测定方法。用涂有OV-17熔融石英毛细管柱。选择游离脂肪酸质谱图中的基峰离子m/z 60进行SIM检测。定量测定了茅台酒、珍酒及鸭溪窖酒中十二种游离脂肪酸。     

多嵌段聚醚氨酯脲为基质的新型高分子固态离子导体

本文合成了一系列聚乙二醇型多嵌段聚醚氨酯脲，而且用这类聚醚氨酯甩与高氯酸锂制得了一种新型的高分子固态离子导体复合物。在室温和50℃之间，其电导率比聚环氧乙烷为基质的固体电解质的高一到二个数量级，它还具有优良的综合性能。因此，对于室温薄膜蓄电池来说，这种新型的固体电解质是一类良好的候选材料。     

人工光合作用反应中心的研究进展

本文对几种人工光合作用反应中心系统,做一个简单的综述,其中包括叶绿素和细菌叶绿素二聚体,卟啉二聚体,卟啉-苯醌共价键络合物以及其他合成中心。     

Diclobutrazol的合成及其生物活性研究

Ｄｉｃｌｏｂｕｔｒａｚｏｌ的合成及其生物活性研究张洪奎，廖联安，陈明德，叶向阳，郭奇珍（厦门大学化学系厦门３６１００５）关键词：Ｄｉｃｌｏｂｕｔｒａｚｏｌ，相转移催化，合成，生物活性Ｄｉｃｌｏｂｕｔｒａｚｏｌ（１）俗名粉锈清，是一种广谱内吸性杀菌剂，...     

非晶态Fe－W合金镀层的表面改性

将Ｆｅ－Ｗ非晶态镀层在铬酸盐钝化液中进行化学钝化与电化学钝化，使之形成含铬钝化膜。阳极极化曲线说明，钝化后镀层的孔蚀电位向正向移动了约１．６８Ｖ；Ｆｅ－Ｗ非晶镀层在氯化钠溶液中浸泡近１ｈ表面发生严重腐蚀，而经钝化处理的镀层浸泡１个月，表面无变化，仍具有金属光泽。     

微克级样品的NMR实验技术研究

作者在500兆周NMR波谱仪上,实验测定了微克级样品的NMR谱图,并讨论了微量NMR技术的一些主要因素。除了尽量选用高场仪器及保持其操作参数最佳化外,样品的制备技术,如选用高纯度氘化试剂,消除溶剂、样品中微量水分等,也是影响实验成败的重要因素。     

NATIONAL STANDARD OF HEAT CAPACITY MEASUREMENT OF SOLIDS IN THE RANGE OF 4.2—90K——AN AUTOMATED ADIABATIC CALORIMETER FROM 25 TO 90K AND MOLAR HEAT CAPACITIES OF α-ALUMINA

The construction of an automated adiabatic calorimeter for heat capacity measurement ofsolids in the temperature range of 25- 90K is described in detail. The sample vessel of thecalorimeter has thin radial vanes which make no contact with its inner wall and are distrib-uted evenly, thus greatly improving the internal thermal equilibration of the vessel. Theprecision of temperature control for the adiabatic shields and electrical leads of the calori-metric system are heightened to a great extent by using the high precision ACD- 79 modeladiabatic controller specially developed by us for this purpose. Measurements of the heatcapacities of high purity α-Al_2O_3, one of the internationally-accepted standard referencematerials, agree with those of the National Bureau of Standards (NBS), USA within ±0.3%,demonstrating the reliability of this apparatus.     

基地建设经验交流

南京大学化学化工学院于1991年被国家教委批准为首批国家基础科学研究和教学人才培养基地."基地方案的制定和实施"于1997年获国家教委优秀教学成果二等奖,并于1998年在国家自然科学基金委组织的中期评估中获得优秀基地的称号,1999年又以优异成绩顺利通过了教育部组织的基地挂牌验收.     

New Photoluminescence Phenomena of Ge／SiO2 Glass Synthesized by Sol-gel Method

New Ge/SiO2 glasses have been synthesized by heating the GeO2/SiO2 dry gels under H2 gas at 700℃. The resulting fluorescence spectra show that this kind of Ge/SiO2 glasses emit strong photoluminescence at 392 nm (3.12 eV), medium strong photoluminescence at 600 nm (2.05 eV) and weak photoluminescence at 770 nm (1.60 eV) respectively. Possible photoluminescence mechanisms are also discussed based on the results of X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS).     

Ring-opening Polymerization of e-Caprolactone Using Lanthanide Tris(4-tert-butylphenolate)s as a Single-component Initiator

The ring-opening polymerization of e-caprolactone (CL) initiated by novel single lanthanide tris(4-tert-butylphenolate)s [Ln(OTBP)3] is reported. Single-component La(OTBP)3 can effectively prepare polycaprolactone (PCL) with over 90% yield and viscosity average molecular weight about 60 x 10 under quite mild conditions: molar ratio of CL to initiator is 1000, 60 C, 2 h in toluene. Mechanism study indicates that the monomer inserts into the growing chain via the break of acyl-oxygen bond of CL.