海水中某些稀有金属的分离预富集和ICP光谱法测定研究

本提出了以聚二硫代氨基甲酸盐螯合树脂分离预富集－ＩＣＰ－ＡＥＳ测定海水中稀有金属Ｕ，Ｎｂ，Ｔａ，Ｚｒ和Ｈｆ的新方法，对上述元素与螯合树脂在不同ＰＨ下的静态交换行为进行了研究。考察一溶液酸度，流速及基体元素对分离富集效果的影响，比较了吸附在树脂上的待测元素的解脱方法，在优化的实验条件下，方法的相对检出限为０．０２－０．１７ｎｇ／ｍＬ，应用于海水试样分析时，其回收率在８１％－９４％之间。     

微分电位溶出法测定人发中铜铅镉锌的研究

本文报道了０．００２５ｍｏｌ·Ｌ￣（－１）ＨＣｌ－０．２ｍｏｌ·Ｌ￣（－１）ＮＨ＿（４）Ｃｌ底液中连续测定人发中铜、铅、镉、锌的微分电位溶出法。四元素峰电位分别为－０．２０Ｖ，－０．４６Ｖ，－０．６７Ｖ，一１．０２Ｖ（ＳＣＥ），峰形好，灵敏度高，干扰少，测定发样相对标准偏差≤４．３％，回收率为９７．６％～１０４．６％。并对ＨＮＯ＿３－ＨＣｌＯ＿４和ＨＮＯ＿（３）Ｈ＿（２）Ｏ＿２消化发样进行了比较。     

邻羟基萘基荧光酮－DDMBA光度法测定微量锗

邻羟基萘基荧光酮－ＤＤＭＢＡ光度法测定微量锗冯永兰，邝代治（衡阳师范专科学校化学系衡阳，４２１００８）关键词：分光光度法，锗，邻羟基萘基荧光酮，溴化十二烷基二甲基苄铵苯基荧光酮类试剂应用于锗的测定已有报导￣［１－６］。但邻羟基萘基荧光酮（β－ＨＮＦ）...     

钌（Ⅲ）—二安替比林对氯苯甲烷—高碘酸钾体系催化分光光度法？…

在磷酸介质中及加热条件下,钌(Ⅲ)对高锰酸钾氧化二安替比林对氯苯基甲烷(DApCM)显色反应有强烈的催化作用,由此建立了测定痕量钌的方法.体系的最大吸收波长为500nm,钌的含量在0.0～4.0μg/L范围内具有线性关系,检测限为1.94×10-10g/mL,反应的表观活化能为88.20kJ/mol,反应表观速率常数为7.7×10-4/s.本方法用于矿样中痕量钌的测定得到了满意的结果.     

磷脂酰胆碱LB单分子膜诱导下KDP晶体取向生长的研究

有机超薄膜诱导晶体生长是在化学、物理与生物多门学科相互交融的基础上发展起来的新兴学科 ,并逐渐成为仿生合成的重要分支 [1] .目前的研究重点主要集中于以有机化合物 LB膜作为模板剂诱导生物矿化材料上 [2～ 5] .磷脂 LB膜是生物膜的简化模型体系 [6 ] ,用它作模板剂将使该领域的研究进一步接近生物体系 .对晶体而言 ,修饰晶体材料的特征对于改善和测定材料的光学性能至关重要 [2 ] ,但目前有关上述领域的研究几乎均是空白 .KH2 PO4 ( KDP)晶体是性能优良的非线性光学材料 [7] ,本文首次以磷脂分子 LB膜作为模板剂诱导 KDP的晶化…     

碳锂化反应的研究进展

介绍了近年来碳锂化反应在分子间和分子内以及不对称反应方面的研究进展。     

碘杂环化合物的1H NMR谱研究

碘杂环类化合物的合成及性质已有报导[1-4],但碘杂环中碘作为正离子的¹HNMR谱报导较少。由于碘正离子诱导效应的结果,使环上相邻质子的化学位移向低场移动,这主要是碘正离子吸引电子的结果,使相邻质子的电子云密度降低,化学位移向低场移动。本文报导了19个碘取代及碘杂环化合物的¹HNMR谱,这种类型化合物的¹HNMR谱未见过系统报导。     

Towards Dynamic Control of Wettability by Using Functionalized Altitudinal Molecular Motors on Solid Surfaces

We report the synthesis of altitudinal molecular motors that contain functional groups in their rotor part. In an approach to achieve dynamic control over the properties of solid surfaces, a hydrophobic perfluorobutyl chain and a relatively hydrophilic cyano group were introduced to the rotor part of the motors. Molecular motors were attached to quartz surfaces by using interfacial 1,3‐dipolar cycloadditions. To test the effect of the functional groups on the rotary motion, photochemical and thermal isomerization studies of the motors were performed both in solution and when attached to the surface. We found that the substituents have no significant effect on the thermal and photochemical processes, and the functionalized motors preserved their rotary function both in solution and on a quartz surface. Preliminary results on the influence of the functional groups on surface wettability are also described.     

Synthesis and Characterization of Iron Nanowires

The iron nanowires can be fabricated via the process in which sodium borohydride reduces iron salts in external magnetic field. The iron nanowires are found to be covered by passivated layers of iron oxide which prevent the oxidation of iron nanowires. In this process, the boron will include in iron nanowires. The average length and diameter of iron nanowires is around 1.2 micrometers and 60 nanometers, respectively. According to ICP results, the contents of B and Fe are about 1.98 wt% and 87.04 wt%, respectively, in iron nanowires. A wide variety of equipment is used to investigate the morphological, microchemical, and structural characteristics of the newly synthesized iron nanowires ––– e.g., XRD, FE‐SEM, HR‐TEM, VSM and XANES. XANES analysis indicates the boron in iron nanowires exists in the form of B₂O₃. The saturation magnetization and the coercive force of iron nanowires are 157.93 emu/g and 9.74 Oe, respectively. In‐situ images of synthesized iron nanowires during reduction process in magnetic field are observed by NSRRC transmission X‐ray microscope. Thus, this study develop a novel process to produce iron nanowires with large quantitates and can control its length and diameter by various the concentration of precursors for various applications.