三氮烯类试剂在镉光度分析中的应用

介绍了1985年以来三氮烯类显色剂在光度分析中的应用,着重介绍了灵敏度高,选择性好的显色剂。     

亚甲蓝在分子有序组合体中的聚集行为

研究了生物染色剂亚甲蓝(MB)在分子有序组合体(胶束、O/W微乳液和层状液晶)介质中的聚集行为。根据MB特征峰处的吸收光谱值,计算了MB的二聚平衡常数和相应单体、二聚体的摩尔消光系数。并用稳态荧光法和无外加探针的循环伏安法进一步论证了计算结果。研究发现,当MB总浓度一定时,在胶束体系中MB单体量较少,在层状液晶体系中单体量较多,在O/W微乳液体系中则介于胶束和层状液晶之间。表明层状液晶体系是获取更多MB单体的理想介质。     

Syntheses of Novel Asymmetric Cyclopentanone Dyes and Measurement of Two－photon Absorption Cross－section

A simple synthesis route with a high yield of novel asymmetric cyclopentanone dyes 3a—3e and their highly two-photon up-converted fluorescences are reported. The dyes have good solubilities in most of ordi-nary solvents, a wide UV absorption wavelength range from 380—540 nm, and high fluorescence quantum yields. The two-photon absorption cross-sections of dyes 3a—M were measured in chloroform by a two-pho-ton induced fluorescence method. All of these properties of the new dyes make them suitable for being used as two-photon fluorescent probes.     

一种含磺酸酯基亲和性变化树脂的合成及其热分解性能研究

本实验合成了一系列含p-苯磺酸异丙酯基亲和性变化的二元、三元共聚物,并对其结构、聚合特征f1-F1曲线以及热分解性能进行了研究.对共聚物的DSC测试发现,随着p-苯磺酸异丙酯基含量的增加,树脂中磺酸酯基的分解温度向低温方向移动,范围在120-170℃;而磺酸酯基的分解能量随其在树脂中含量的增加而升高,范围在20-30kJ/mol.动力学研究结果显示,聚合物中磺酸酯基的热分解过程属于自加速类型,反映了热分解产生的磺酸对磺酸异丙酯热分解过程的催化作用.加热分解后树脂水溶性的研究表明,在二元共聚物中磺酸酯基单元含量等于或大于27%,在引入羧酸基的三元共聚物中磺酸酯基单元含量为21%时,热分解后共聚物涂层表现出优良的水溶性,能够在中性水中快速、彻底溶解并脱离支持版基.     

涤纶工业丝等温收缩中的结构变化

采用广角X 射线衍射、密度梯度、声速和差示扫描量热等实验方法对 145 5dtex/ 110f成品涤纶工业丝等温收缩的结构变化进行了表征 ,外加张力为 0 3N ,测定温度范围 375～ 494K .结果表明 ,涤纶工业丝的热收缩在宏观上表现为速率不同的两个过程 ,对应两种不同机理 .其中快过程对应非晶区的解取向 ,对收缩的贡献是主要的 ;慢过程对应晶区的变化 ,包含了晶粒的增长 ,新的不完善晶粒的形成和晶区的完善 .晶粒的增长在较短的时间内基本完成 ,再结晶则存在于整个收缩过程 .随温度的升高 ,晶区变化速度明显加快 ,对非晶区解取向的抑制效应因此变大 .     

LC-APCI-MS法同时分离测定人体血浆中的精氨酸及二甲基精氨酸的含量

建立了简单、灵敏和快速分离测定人体血浆中L-精氨酸(ARG)、不对称二甲基精氨酸(ADMA)和对称二甲基精氨酸(SDMA)的等度高效液相色谱-质谱联用方法.采用选择性离子检测(SIM)和大气压化学电离离子化(APCI),L-高精氨酸作内标,整个方法测定时间在5min以内.ARG,ADMA和SDMA的分析限均为0.2μmol/L,日间和日内测定的精密度分别为2.9%～6.7%和2.1%～5.2%,标准加入回收率为94.0%～105.0%.采用上述方法测定人体血浆中的精氨酸及二甲基精氨酸的含量,结果令人满意.     

Substituent Effects on the Hydrogen Bonding Between Phenolate and HF, H2O and NH3

IntroductionSubstituent effects have been well known forthe covalently bonded systems for many years,they have found tremendous applications in medicalchemistry,biochemistry,organic chemistry,andmaterial chemistry[1] . In fact,the studies ofsubstituent effects have greatly contributed to ourunderstanding of chemical mechanisms,and theestablishments of many chemical theories haveheavily relied on the observed substituent effects.However,it turns out that little have beenknown so far the substit…     

动态显示增透膜的增透特性

设计了一种简易的模拟实验装置,可以动态显示单层增透膜的增透特性,以及膜层的厚度变化对增透效果的影响.     

在光电效应实验中测量光电管的基本特性

在光电效应测量普朗克常数实验装置的基础上介绍了测量光电管的光频特性、伏安特性和光照特性的实验方法,给出了相应的实验结果,拓宽了实验内容、增强学生综合实验能力。     

Radiative leptonic decay B-c→τ-(v)τγ in the standard model and the two-Higgs-doublet model

We analyze the radiative leptonic Be decay B-→τ-(v)τγ in the Standard Model and the twoHiggs-doublet model using the non-relativistic constituent quark model.The results confirm that this channel is experimentally promising in view of the large number of Bc mesons which are expected to be produced at future hadron facilities.We also find that this decay is sensitive to the parameters of the two-Higgs-doublet model,and it can be tested in future experiments.