不同孔隙率及孔径泡沫铝的力学与吸能特性研究

对三种孔径两种孔隙率共六种泡沫铝试件进行了静态压缩试验,发现对于中孔隙率材料,孔隙率对材料力学性能和吸能性能仍有明显影响:孔隙率越大,其吸能能力越强,但是屈服极限越小.孔径对材料吸能能力也有一定影响.同时,试验中还发现,对于孔隙率为55%的材料,当孔径≤1mm时,泡沫铝材料的孔径对其力学性能及吸能性能影响甚小.     

N-[3-聚醚-3-(二甲氨基)-丙基]全氟辛基磺酰胺的合成及表面性能

阳离子氟碳表面活性剂;聚醚类;季铵盐型;临界胶束浓度     

乙醇溶液中电沉积CuInSe2(CIS)薄膜过程研究

采用三电极体系,以钼片为工作电极,大面积铂网为辅助电极,饱和甘汞电极(SCE)为参比电极,以氯化铜、氯化铟、亚硒酸为原料,在无水乙醇溶液中,用阴极恒流和恒压两种沉积方法制备出CIS前驱体薄膜,采用XRD和EDAX对制备的薄膜进行了表征,分析了沉积方式、镀液离子浓度、导电盐(LiCl)含量及热处理工艺等因素对薄膜成分及形貌的影响,并对电沉积CIS薄膜的机理进行了初步探讨.在最优条件下所制备的薄膜成分接近标准比且表面致密、均匀.     

Synthesis and Crystal Structure of First Trinuclear Copper(Ⅰ) Complex with Coplanar Cu3O3 Core

Very recently, five-coordination copper(Ⅰ) complex with distorted square-pyramidal geometry,[CuL¹(NCCH₃)]⁺(L¹=Dimethyl-2,4-bis(2-pyridinayl)-3,7-diazabicyc lo-[3.3.l]-nonane-9-on-l,5-dicarboxylate)^[1], has been synthesized. X-ray structure shows that the rigid ligand L^[1] is well suited for copper(Ⅱ) ion, and highly strained for copper(Ⅰ) ion. Those results indicate that the lack of Jahn-Teller effect of copper(Ⅰ) ion often decreases the stability of copper(Ⅰ) precursor complexes, and plays an important in the transportation or activation of dioxygen for copper-containing proteins^[1].     

The Effects of Citrato Molybdate on the Growth,Rate of Azotobacter Vinelandii

An iron-molybdenum cofactor (FeMoco or M-cluster) of nitrogenase is believed to be the active center for the N₂-binding and reduction. Recent X-ray crystal structure of MoFe-protein revealed the FeMoco as FeS₃Fe₃(S)₃Fe₃S₃Mo(R-homocitrate) cluster and the biosynthesis of FeMoco requires at least six nif gene products. FeMoco should be assembled firstly and then inserted into the FeMoco-deficient dinitrogenase. It has been known that the NifB-co, the product of nifB, is an iron and sulfur-containing precursor of FeMoco. However, how the molybdenum and homocitrate are assembled into molybdenum free NifB-co remains unknown.     

Synthesis of 1,4-Bis(Chloromethyl)-2-Methoxy-5-Phenoxy Benzene

Much attention has been paid to Poly(p-Phenylene Vinylene) (PPV) because they are associated with good electro-optical characterization, especially electro-luminescence which first discovered by Burroughes in 1990^[1]. 1,4-bis(chloromethyl) benzene is an important tool to synthesize PPV by dehydrochlorination. So the chloromethylation of substituted benzene becomes active. We once synthesized a series of dialkoxyl bischloromethyl benzene^[2]. Unfortunately, short chain alkoxyl-substituted PPV has poor solubility, which limits its utility. There are little reports on aryloxy PPV up to now, while aryloxy-substituted PPV may has good mechanical properties.     

全氟或多氟烷基氯代烷在保险粉引发下与芳香烃 的反应

全氟或多氟烷基氯代烷在保险粉引发下在DMSO溶剂中可以与富电子芳香烃反应,方便地得到氟烷基化的产物。氟烷基化产物的结构和产率主要取决于取代基的供电子能力和位置。     

多孔玻璃载体自转晶B-Al-MFI型沸石膜的原位合成

在乙胺和水的混合蒸汽相中,首次通过载体自转晶,在多孔玻璃表面原位合成了B-Al-MFI型沸石膜。X射线衍射和扫描电镜观察证明,膜中沸石晶体的取向是随机的。晶体尺寸约为15～25μm,单层晶体厚的膜约为10～20μm。在焙作去有机模板剂后的沸石膜上,O~2和N~2的透过性分别为0.095×10^-^8和0.15×10^-^8mol/(m^2·s·Pa)。计算的O~2/N~2的理想选择值(0.63)明显低于诺森扩散的理想选择性值(0.94)和透过原载体的理想选择性值(0.91)。     

堇青石载体表面Silicalite-1沸石膜的合成与表征

沸石分子筛膜是近十年发展起来的一种新型无机膜.它具备一般无机膜结构稳定、耐高温与化学侵蚀、机械强度高等优点.尤其是,它的结构孔径均匀、精密,具备分子筛分性能.沸石晶体中的阳离子可被其它离子交换.硅铝比可以调节,硅铝原子可被其它原子取代.这些特性,使研制孔径与分子尺寸相匹配、均匀致密的沸石分子筛膜,成为实现分子水平上分离和膜催化的关键.这是当前无机膜材料研究的前沿和热点[1-4].     

非金属二元氢化物分子振动固有频率与pKa常数的定量关系

提出了非金属二元氢化物分子振动固有频率的计算原理与方法.将基频和总频作为结构信息指数用于非金属二元氢化物的分子结构与pK_a常数的定量关系研究,结果表明,其相关系数大于0.995,得到的回归方程用于pK_a的计算,计算值与实验值比较,平均绝对误差小于1.82.