反相流动注射-化学发光法测定苯胺

在酸性介质中,苯胺与过量亚硝酸盐重氮化,剩余亚硝酸盐快速氧化亚铁氰化钾,生成的铁氰化钾与鲁米诺发生化学发光反应。据此,建立了反相流动注射 化学发光法测定苯胺的新方法。方法的线性范围为0 070～10.0mg L,检出限为0 03mg L,相对标准偏差(n=11,ρ=1.0mg L)为2 0%。方法已用于环境水样中苯胺的测定。     

流动注射化学发光测定人体血清中的DNA

在硝酸介质中,DNA被高锰酸钾氧化能产生很强的化学发光,而且发光强度在一定的范围内与DNA的浓度呈线性关系,据此建立了流动注射化学发光测定DNA的新的分析方法。探讨了最佳的发光条件。测定的线性范围为20～100μg mL,检出限为6.2μg mL。进样频率为40次 h。该法应用于人体血清中DNA的测定。     

锂喹啉配合物作为电子注入层对有机电致发光器件性能的影响

利用锂喹啉配合物(8-hydroxy-quinolinato lithium,Liq)作电子注入层,制备了结构为氧化铟锡／锂喹啉配合物铝{ITO(indium tin oxidc) TPD(N,N′-di-phenyl-N,N′-bis(3-mmethylphenyl)-l.l′biphenyl-4,4′diamine)/Alq3[tris-8-hydroxy-quinolinato)aluminum] Liq AI的电致发光器件。通过改变电子注入层Liq的厚度,考查了Liq厚度对器件电致发光效率及电流密度-电压关系的影响。实验表明Liq厚度大约为0．5nm左右时器件的性能最佳、电致发光效率约为没有Liq器件效率的5倍,而定电流下的工作电压最低,其原因可归于Liq在金属铝电极与有机层Alqs之间产生偶极层,使铝与有机层间的界面接近欧姆接触,从而使电子注入效率大幅提高;随着Liq厚度的增加,器件的电致发光效率降低,而定电流下的工作电压升高,与同类型以LiF作注入层的器件相比,这种器件性能受厚度影响而变化的趋势是类似的,但以Liq作注入层的器件具有较低的厚度敏感性,这是由于LiF为绝缘体,而Liq为半导体的缘故。Liq作注入层器件的这种对注入层厚度的不敏感性对批量生产中所用的大尺寸基底来说是非常有利的。     

鲁米诺-铁氰化钾化学发光体系测定甲基多巴

本文研究发现,铁氰化钾在碱性条件能氧化鲁米诺产生微弱的化学发光,而甲基多巴能大大增强该体系的发光强度.基于此,结合流动注射技术,建立起一种直接测定甲基多巴的流动注射化学发光新方法.该方法的检出限为5.7×10-10g/mL,甲基多巴浓度在1.0×10-9～1.0×10-7g/mL范围内与发光强度呈良好的线性关系.对1.0×10-9g/mL的甲基多巴平行测定11次,其相对标准偏差为2.3%.利用该方法对甲基多巴片剂含量的测定,结果令人满意.     

FIA-3100流动注射仪数据采集系统的开发及其应用

介绍了一种数据采集系统,阐述了系统组成、实现和主要功能,并结合梯度稀释技术介绍了其在火电厂炉水磷酸根测定中的应用．     

Effect of Growth Temperature on the Characteristics of CsPbI3-Quantum Dots Doped Perovskite Film

In this study, adding CsPbI₃ quantum dots to organic perovskite methylamine lead triiodide (CH₃NH₃PbI₃) to form a doped perovskite film filmed by different temperatures was found to effectively reduce the formation of unsaturated metal Pb. Doping a small amount of CsPbI₃ quantum dots could enhance thermal stability and improve surface defects. The electron mobility of the doped film was 2.5 times higher than the pristine film. This was a major breakthrough for inorganic quantum dot doped organic perovskite thin films.     

玻璃芯片上温控微阀的制备和微流体控制性能研究

聚N-异丙基丙烯酰胺(PNIPAAm)在临界温度(32 ℃)附近会发生敏锐的相变, 导致其体积和表面亲疏水性的突变. 利用这种由温度刺激引起的体积变化, 可以控制微通道内微流体的运动状态. 本文以2-羟基-2-甲基-1-苯基丙酮为引发剂, 水-乙醇混合体系为溶剂, 在玻璃芯片通道内局部区域以紫外光诱导聚合PNIPAAm整体柱塞, 制备温控微阀. 系统地考察了聚合条件对该阀的形态和性能的影响. 在此基础上, 建立了一个芯片上的集成化单温控阀流动注射分析模型, 利用镁离子与荧光探针O,O'-二羟基偶氮苯的螯合荧光反应, 表征温控微阀的控流效果. 结果表明, 所制作的微阀温控效果良好, 在微流控领域有应用前景.     

Studies on melt flow properties during capillary extrusion of PP/Al(OH)3/Mg(OH)2 flame retardant composites

The apparent melt shear viscosity of polypropylene (PP) composites filled with aluminium hydroxide (Al(OH)₃) and magnesium hydroxide (Mg(OH)₂) was measured by means of a melt flow rate instrument under experimental conditions of temperature ranging from 170 to 195 °C and load varying from 2.16 to 12.5 kg, to identify the effects of particle size and content. The results showed that the melt shear flow of the composites obeyed the power law under the experimental conditions, the dependence of the melt apparent shear viscosity (η_a) on temperature was consistent with the Arrhenius equation, and the sensitivity of the η_a for the composite melts to temperature increased with addition of flame retardant. The η_a of the composites decreased with increasing apparent shear rate. The η_a increased with an increase of the content of flame retardant, but this rate of increase decreased with a rise of temperature or load. When the particle size of flame retardant was smaller than 5 μm, the η_a of the composites increased with increase of particle size of flame retardant, and then reduced with a further increase of particle size of flame retardant.     

Local effects of atomizing analyte droplets on the plasma parameters of the inductively coupled plasma

Monodisperse droplets from aqueous analyte solutions with selected diameters in the range 35–67 µm are introduced into an inductively coupled plasma with frequencies between 1 to 10 droplets per second. The effect of desolvation and atomization in the ICP is studied end-on by optical emission spectroscopy employing simultaneously up to three calibrated monochromators with fast photomultipliers. The onsets of desolvation and analyte atomization and the extremely fast diffusion of hydrogen in the ICP and its effect on the plasma are studied by simultaneous measurements of hydrogen, analyte and Ar lines. The local cooling by analyte atomization as well as the recovering of the plasma excitation temperature after completed atomization is measured quantitatively in dependence on time applying the Boltzmann plot method to simultaneously recorded line intensities of atomized analyte atoms which act as plasma probes. Furthermore, it is shown that relatively small differences in analyte mass cause significant temperature changes during atomization and, as consequence, strong variations of the emission intensity of analyte lines during atomization if measured by end-on observation.     

胶束敏化化学发光法测定赤藓红

N-氯代丁二酰亚胺在碱性条件下可氧化赤藓红产生弱的化学发光.十六烷基三甲基溴化铵胶束的存在对这一反应的化学发光信号具有显著的增强作用.基于此,结合流动注射技术,优化了化学发光反应条件,建立了测定赤藓红的化学发光新方法.赤藓红质量浓度在1.0×10-7～1.0×10-5g/mL范围内与化学发光强度具有线性关系.该方法测定赤藓红的检出限为3×10-8g/mL,相对标准偏差为3.7%(1.0×10-6g/mL赤藓红溶液,n=11).该方法已用于糖果中赤藓红含量的测定.