一种新型稀土光转换材料的合成及其与农膜(PE)相容性研究

合成了铕与长链羧酸(SA)、二苯甲酰甲烷(DBM)、邻菲罗啉(phen)形成的四元配合物,用元素分析(EA)、红外光谱(FT-IR)、氢谱(1HNMR)和紫外光谱(UV)对所合成的铕配合物进行了袁征;由于长链羧酸的引入,配合物在氯仿等挥发性有机溶剂中具有好的溶解性,为与高分子基体复合创造了条件;配合物在波长342nm激发下,发出以铕的特征发谢谱线612nm左右为主的强荧光,实现了由紫外光向植物需要的红光的转换.     

安息香-邻菲罗啉-铕三元配合物的合成及光致发光性能

合成了配体安息香(BZ)和新的铕配合物Eu(BZ)_3 phen,并用元素分析(EA)、IR、~1H-NMR和UV对配合物进行了表征;配合物Eu(BZ)_3 phen在波长310nm激发下,发出以铕的特征发射谱线612nm左右为主的强荧光,对应跃迁为~5D_0→~7F_2;安息香对铕离子具有敏化作用,是铕配合物的良好配体.     

2-苄基-1,3-二苯基-1,3-丙二酮的合成及其铕配合物光致发光

合成了新的配体2-苄基-1,3-二苯基-1,3-丙二酮和新的铕配合物Eu(RDBM)3phen,并用元素分析(EA)、IR和UV对配合物进行了表征;配合物Eu(RDBM)3phen在波长328nm激发下,发出以铕的特征发射谱线615nm左右为主的强荧光,对应跃迁为5D0→7F2;2-苄基-1,3-二苯基-1,3-丙二酮对铕离子具有敏化作用,是铕配合物的良好配体.     

一种新的可聚合铕配合物单体的合成及其发光性质

合成了新的可聚合的β-二酮(MADBM)及其铕配合物Eu(MADBM)3phen,并用元素分析(EA)、IR、1HNMR,XPS和UV对配合物进行了表征;配合物Eu(MADBM3phen在波长340nm激发下,发出以铕的特征发射谱线615nm左右为主的强荧光,对应跃迁为5D0→7F2;MADBM对铕离子具有强烈的敏化作用,是铕离子的良好配体并具有可聚合性.     

SiO_2/稀土Eu(Ⅲ)配合物核-壳复合粒子的制备及发光性能研究

采用St ber法制备了粒径为40~60nm的单分散纳米SiO2微球,以氧化铕为原料、α-噻吩甲酰三氟丙酮和邻菲啰啉为配体制备了稀土铕的三元配合物,并将其成功包覆在SiO2微球表面,形成核-壳复合粒子。采用红外光谱和元素分析表征配合物的结构。透射电镜照片表明,稀土有机配合物在SiO2微球表面形成了致密的纳米级包覆层,包覆层厚度随配合物用量的增加而增加。复合粒子呈现出很强的Eu配合物发光,纳米SiO2核对配合物有荧光增强作用,但配合物浓度较高时荧光增强效应有所减弱。     

5修-铕油酸长链配合物的性质研究

本文合成了以Eu3+为中心离子,芳香羧酸、邻菲咯啉和噻酚甲酰三氟丙酮为第一配体,油酸为第二配体的七种新的铕三元荧光配合物。通过红外光谱分析、紫外光谱分析、元素分析、EDTA配位滴定分析以及电导率的测定对铕三元荧光配合物的组成及结构进行表征。通过荧光光谱分析,确定了铕三元荧光配合物的最佳激发波长,在最佳激发波长下测定了它们的发射光谱。结果表明,所有铕三元荧光配合物的荧光发射光谱均相似,发出了铕离子的5D0-7F2,5D0-7F1,5D0-7F0(很弱)特征光,荧光表现为红色。在含油酸配体的铕三元荧光配合物中,各第一配体向铕离子传递光能的能力为:邻菲咯啉>噻吩甲酰三氟丙酮>大茴香酸>间氯苯甲酸>苯甲酸>对甲基苯甲酸>对羟基苯甲酸。     

PVA基红光薄膜的制备及其性能研究

以纯红光材料稀土铕配合物Eu(TTA)_2TPY-OCH_3作为发光体,将其掺杂到聚乙烯醇(PVA)基质中通过流延法制备一系列不同浓度的PVA红光薄膜。利用红外光谱、紫外-可见光光谱、荧光光谱、差示量热以及热重等手段对荧光薄膜的结构和性能进行了分析表征。结果表明:铕配合物含量在1%~7%(质量分数)时,PVA荧光薄膜的荧光强度并未出现浓度淬灭现象,随着掺杂铕配合物浓度增加,发光强度逐渐增强。另外,PVA荧光薄膜的玻璃化温度随铕配合物含量升高而降低,所有荧光薄膜失重5%时的热分解温度均在230~240℃之间,热稳定性较好,能够满足其在众多领域的应用。     

新型两亲性铕配合物LB膜的性质研究

研究了一种新型带有长烷基链的铕配合物Langmuir-Blodgett（LB）膜及其发光性质。实验结果表明，此种配合物能够在水面上形成稳定的单分子膜，单分子占有面积为0．6nm^2，并可将单分子Langmuir膜沉积在亲水的石英基片上，其紫外结果表明，位于287nm处的主吸收峰随着LB膜层数的增加而增加，其吸收强度随层数的增加呈线性关系，证明可以形成均匀LB膜。对其LB膜的荧光光谱研究结果显示，具有典型的铕配合物的发射峰，且具有一定的荧光强度。这为以铕配合物作为分子器件的材料研究提供了实验基础。     

稀土铕有机配合物的研究进展及其应用

目的 介绍稀土铕有机配合物的原理、分类、应用及其最新研究进展,为高性能稀土铕配合物的研发提供一定的思路和依据。方法 通过查阅国内外学者近年来对稀土铕有机配合物的各种研究文献,对稀土铕有机配合物的主配体种类及应用进行整理总结。结果 稀土铕有机配合物的主配体有四大类,即β-二酮类、羧酸及羧酸盐类、有机高分子类与超分子大环类,该配合物主要应用于荧光材料、发光材料、磁性材料和生物等四大领域。结论 铕有机配合物的荧光性能良好,且高分子类配合物易加工成型;有机高分子类铕配合物可以结合Eu3+和高分子的优点,在提高其与聚合物材料相容性的前提下,有望成为一种新型的功能材料。     

Ag@SiO_2/Eu(Ⅲ)配合物纳米复合颗粒的制备及荧光性能研究

通过三步反应成功将铕配合物(EuTP)包覆在纳米核壳结构Ag@SiO2复合颗粒的表面。采用化学还原法制备了粒径25~30nm且分散性良好的纳米银溶胶;然后采用改进的Stber法制备了壳层厚度在20nm左右的Ag@SiO2复合颗粒;以氧化铕、α-噻吩甲酰三氟丙酮、邻菲罗啉为原料制备EuTP,并成功包覆在核壳结构的表面。分别采用TEM、FTIR、XRD等对样品的结构进行了表征,并通过对比相同浓度的三价铕的配合物EuTP与复合粒子Ag@SiO2@EuTP的荧光发射光谱发现,SiO2壳层厚度在20nm左右时Eu配合物的荧光强度明显增强,而且随着核壳结构表面配合物浓度的增大,包覆层的厚度增大,荧光强度也呈现增强趋势,对于稀土的研究具有重要的意义。     

Degradation of pentachlorophenol with zero-valence iron coupled with microwave energy

The objective of this research is to study the degradation of pentachlorophenol with zero-valence iron (Fe(0)) coupled with the use of microwave energy. The sample containing 1000 mg/L PCP solution was dosed with 0.5 g Fe(0) and then subject to 700 W microwave energy for 10s; 85% pentachlorophenol was noted to be removed. If the microwave treatment time was increased to 30s, the pentachlorophenol removal efficiency exceeded 99% with end products including H(2)O, CO(2), HCl, etc. Using Fe(0) as a medium, the microwave treatment is made an efficient method for degrading pentachlorophenol. The time needed to achieve a satisfactory treatment is also reduced leading to significant savings of energy consumption to make this method cost-effective. Since this technology applies Fe(0), which is amenable to natural environment, to speed up the decomposition of an industrial solvent, it is not only cost-effective but also environmental friendly for the industry to pursuit sustainable development.     

Complications associated with the development of bacteremia with Staphylococcus aureus

Access-related infections are a leading cause of morbidity and mortality among hemodialysis patients. Staphylococcus aureus bacteremia accounts for 25% of these episodes. Nissenson et al., found that 20.7% of the patients developing S. aureus bacteremia had infectious complications as well as hospital readmissions related to the S. aureus bacteremia. This retrospective analysis did not determine whether the S. aureus bacteremia was access related, nor how each episode was treated. We have prospectively collected a database of all access-related S. aureus bacteremia developing in our unit between 1/1/03 and 8/31/05, including the management of the access. Episodes of S. aureus bacteremia with an identifiable source other than the vascular access were excluded. Seventy-two episodes of S. aureus bacteremia were identified; 54 developed in patients using a catheter and 18 developed in patients using an arteriovenous graft/fistula. The mean age was 64+/-15 years, and 56% of the patients were Caucasian. All patients were treated with 4 weeks of antibiotics. A total of 6 (8%) deaths and 15 (20.8%) infectious complications related to the S. aureus bacteremia were identified. Infectious complications included endocarditis (4), metastatic infection (7), discitis (3), and a myocardial abscess (1). Seventeen (23.6%) of the patients were readmitted within 30 days of the episode of S. aureus bacteremia; 4 readmissions were related to the S. aureus bacteremia. Five of the 54 catheter patients who developed S. aureus bacteremia expired and 14 developed infectious complications despite the catheter being removed/exchanged in all but one patient. One of the arteriovenous graft patients who developed S. aureus bacteremia expired. We conclude that infectious complications from S. aureus bacteremia are common, as 23.6% of the patients in our study developed an infectious complication. Eight percent of the patients who developed S. aureus bacteremia expired. Strategies to avoid S. aureus bacteremia are needed.     

Transverse Vibrations of an Orthotropic Plate with a Collection of Inclusions of Any Configuration with Different Types of Connections with the Matrix

Materials Science - Within the framework of an improved theory that takes into account transverse shear strains and inertial components, we construct the solution of the problem of stationary...     

酸酐固化侧链取代液晶环氧树脂的性能研究

采用DSC、DMA、TGA、SEM等研究了侧链取代液晶环氧树脂酸酐固化产物的动态力学和机械性能，并就侧链长度对液晶环氧树脂的性能影响进行了探讨。结果表明：侧链取代液晶环氧树脂表现出较高的模量和优良的耐热性能，其韧性也得到明显的改善。随着侧链长度的增加，固化产物的交联密度有所下降，随之下降的还有玻璃化转变温度、动态储能模量、弹性模量以及断裂伸长率。柔性链的增加也使其耐热性能下降，而其耐水性能则有所提高。     

用二胺在碳纳米管上引入胺基团的研究

为了在碳纳米管上引入胺基团，先对CVD法制备的多壁碳纳米管进行了有效的纯化和功能化，用TEM观察了纯化过程中的杂质变化和碳纳米管的形态结构，然后用二环己基碳二亚胺(DEC)缩合剂使功能化了的多壁碳管和乙二胺反应，并采用FF-IR红外光谱和Raman光谱对反应前后的碳管进行了表征。红外光谱测试结果表明：反应前红外光谱中在1709cm^-1处有羧基的吸收峰，说明碳纳米管的端口及侧壁已被有效功能化；反应后在1581cm^-1出现吸收峰表明二者通过酰胺键连接起来，增强了碳纳米管在有机溶剂中的溶解性；Raman光谱中反应前后D峰和G峰无明显区别，表明反应前后碳纳米管结构未发生变化。     

Detection of methane with high spatial resolution with photothermal deflection spectroscopy

We demonstrate the use of photothermal deflection spectroscopy for detection and measurement of methane with very high spatial resolution. A high spatial resolution may be important for some applications, and other techniques in current use do not provide this resolution. To the best of our knowledge, this is the first application of photothermal spectroscopy to methane detection. We have succeeded in detecting a signal even from a very weak combination-overtone band of methane in the visible region of the spectrum. If used in conjunction with a strongly absorbing fundamental band, the technique is capable of yielding high sensitivity along with very high spatial and temporal resolutions.     

基于石英晶体微天平的聚醚酰亚胺湿度传感器

研制了基于石英晶体微天平方法的聚醚酰亚胺湿度传感器,研究了它对相对湿度的响应特性和灵敏度以及这种湿度传感器在高湿度对比下的循环特性和长期老化性能。结果表明:在较宽的湿度范围内,这种湿度传感器表现出良好的湿敏特性。当相对湿度从11%变化至95%时,频率变化达2000Hz。高湿度差对比下的响应时间和恢复时间分别为30和20s。在循环测试和长时间老化测试中,也表现出优良的重复性和稳定性。