共查询到19条相似文献,搜索用时 109 毫秒
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《应用化工》2022,(3):580-583
以巯基乙酸为稳定剂水热法制备Cd Te量子点,考察不同条件下四环素对Cd Te量子点的荧光猝灭作用,建立一种荧光测定四环素含量的新方法。该方法的线性范围为1.020.0μg/m L,工作曲线为ΔF=2.308 2+9.679 3c(μg/m L),相关系数r为0.999 5,检出限(3SD/斜率)为0.025μg/m L。该方法应用于实际样品中四环素含量的测定,相对标准偏差<2.3%,回收率在97.5%20.0μg/m L,工作曲线为ΔF=2.308 2+9.679 3c(μg/m L),相关系数r为0.999 5,检出限(3SD/斜率)为0.025μg/m L。该方法应用于实际样品中四环素含量的测定,相对标准偏差<2.3%,回收率在97.5%103.3%。 相似文献
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本文采用水热法分别制备了Mn2+掺杂ZnS量子点和聚苯乙烯-甲基丙烯酸聚合物,超声辅助包裹法制备双酚A印迹型量子点纳米微球复合物。通过量子点荧光猝灭效应对双酚A进行定量分析。本实验考察了量子点共聚物与双酚A在不同pH值的缓冲溶液中作用及不同反应时间对量子点荧光猝灭效率的影响。实验结果表明,在pH10.5的碱性介质及反应时间30min条件下,方法的线性范围为60~820 ng.mL-1,检出限为0.02μg.mL-1。该方法用于环境水样中双酚A的测定,结果满意。 相似文献
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介绍了一种利用荧光猝灭反应动力学原理探测氧浓度的新方法,报告了一种性能优异的荧光大分子材料,建立了相应的光学探测装置,并详细地研究了实验溶剂、荧光材料在硅橡胶膜中的浓度等因素对设备性能的影响。 相似文献
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用巯基丙酸作为稳定剂,在水相中合成了CdS量子点。基于Cu^2+对CdS量子点有显著的荧光猝灭作用,建立了检测水相中微量Cu^2+的新方法。研究结果表明,在弱碱性的水溶液中,当Cu^2+的浓度在1×10^-5-3×10^-4 mol·L^-1之间时,量子点的荧光猝灭强度△F/F与Cu^2+的浓度之间很好地符合Stern-Volmer线性方程,线性相关系数为0.9952。方法的检出限为5.85×10^-6 mol·L^-1,相对标准偏差为3.75%,加标回收率为95.5%-118.5%。讨论了量子点的荧光猝灭机理。在研究金属离子和一些化合物的干扰作用时,发现有的物质使量子点的荧光猝灭,有的物质却使量子点的荧光强度增强,发光强度对不同的物质就具有选择性。选择合适的掩蔽剂可以消除较强的离子干扰。 相似文献
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合成了13种金属有机络合物,从中筛选了两种性能优良的氧感应指示剂[Ru(bathophen)3](ClO4)2和Pt(TFPP).通过试验确定了制备氧感应膜的最佳方法,制成了两种灵敏度高、响应快、光学稳定性好的氧感应膜:[Ru(bathophen)3](ClO4)2-Cab-O-Sil-silicone膜和Pt(TFPP)-silicone膜.对影响氧传感器性能的因素进行了分析.以[Ru(bathophen)3](ClO4)2-Cab-O-Sil-silicone膜为氧感应膜,研制了一种非接触式氧传感器,该传感器能在计算机控制下同时对大批样品进行扫描检测.还用此传感器进行了生物毒性试验,检测了多种重金属离子对活性污泥和大肠杆菌的毒性影响,结果表明,用该传感器进行毒性试验是可行的,它具有灵敏、快速、高效的特点. 相似文献
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以巯基乙酸为稳定剂,在水溶液中合成了CdTe/CdS量子点,基于十六烷基三甲基溴化铵(CTAB)与CdTe/CdS量子点的荧光猝灭作用,建立了用CdTe/CdS量子点作为荧光探针测定水中微量十六烷基三甲基溴化铵的新方法。考察了缓冲溶液、pH和量子点浓度等因素对体系荧光强度的影响。结果表明,在pH为6.8的磷酸二氢钾-硼砂缓冲溶液中,当CdTe/CdS量子点浓度为3.75×10-4mol/L时,体系的相对荧光强度与十六烷基三甲基溴化铵的浓度在5.49×10-7~4.12×10-5mol/L范围内呈现良好的线性关系,相关系数为0.999 7,检出限为5.43×10-8mol/L。方法应用于水中微量十六烷基三甲基溴化铵测定,回收率在96.7%~101.7%。 相似文献
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利用双柱定容容量法实时记录的数据研究了氮气和氧气在碳分子筛及13X分子筛上的吸附动力学行为,重点讨论了吸附时体系内的温度变化情况以及温度变化对于吸附和扩散行为的影响,指出建立数学模型时,温度变化的不可忽略性,同时获得了可用于非等温动力学模型计算的数据. 相似文献
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目视法检测阴离子用显色剂的研究进展 总被引:2,自引:1,他引:2
评述了以超分子化学分子识别为基础发展起来的新型阴离子目视显色剂,内容主要包括显色剂对选择性阴离子的显色属性以及显色属性和显色剂结构的关系. 相似文献
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A. Cartellier 《化学工程与技术》2001,24(5):535-538
Concentration, velocity, size and interfacial area density are key parameters in the design of multiphase processes involving bubbles or droplets. Optical probes provide a relatively simple and cheap mean to measure these quantities. In this paper, recent advances in probe design and signal processing are summarized, and the performances of these systems are discussed. Finally, various applications are presented and known limitations of the technique are underlined. 相似文献
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Bubble and droplet size distribution influence chemical processes markedly. In order to enable an in‐line analysis of these distributions, a new single‐sided endoscopic version of the Optical Multimode Online Probe (OMOP) was developed. The acquired images are analyzed to gain bubble size distributions (BSDs) and main diagonals. A specific workflow was developed to detect and analyze overlapping bubbles based on standard image processing techniques. It can handle overlapping bubbles of both circular and elliptical shapes. Results confirmed that the combination of OMOP and the image processing workflow leads to robust detection of bubbles from two‐dimensional images. The new single‐sided OMOP proved to be a suitable tool for the acquisition of a BSD at industrial scale within a reasonable computing time. 相似文献
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《Journal of the European Ceramic Society》2023,43(15):7085-7095
The impact of minor stoichiometric variations on the microstructure, optical characteristics, and luminescent properties of YAG:Cr ceramics, synthesized from chemically precipitated ceramic powders, was assessed for the first time. Transparent ceramics with over 70% transparency was produced with a nominal yttrium excess ranging from 0.47 to −1 mol.%. The phase composition, microstructure, and luminescent properties of quasi-stoichiometric YAG:Cr ceramics were examined, and the impact of stoichiometric deviations on the crystal lattice parameter and average grain size in ceramics was outlined. An examination of the optical characteristics of the ceramics revealed a specific absorption band in the case of yttrium excess. The effect of stoichiometry deviation on the luminescent properties of YAG:Cr ceramics was investigated. A change in stoichiometry from −1–0.47 mol.% excess yttrium resulted in a broadening of the luminescence R-line and a decrease in the lifetime of the excited state of Cr3+ from 1.91 to 1.81 ms. 相似文献
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The optical absorption matrix element as a function of one-dimensional (1D) wave vector k, and subband index μ of a single wall carbon nanotube is given analytically for linearly polarized light with polarization parallel to the nanotube axis. For armchair nanotubes, it is found that the optical transitions for non-degenerate A symmetry bands are forbidden over the whole 1D k region and the transitions for all other bands are also forbidden at the k = 0 point. Near the Fermi level, the absorption for all metallic nanotubes is found to be approximately zero. For both metallic and semiconducting nanotubes, it is found that the absorption matrix element has a maximum absolute value at the van Hove singularity (vHS) k point around the Fermi energy for each band. The absorption dependence on diameter and chiral angle is also presented for semiconducting nanotubes. For light polarization perpendicular to the nanotube axis, on the other hand, the absorption for nanotubes is generally weak near a vHS. 相似文献