共查询到20条相似文献,搜索用时 62 毫秒
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由电聚合法用聚苯胺修饰碳纤维电极作为PH敏感电极。 把K3Fe(CN)6/K4Fe(CN)6体系填入医用注射针头内成为参比电极。把经聚苯胺修饰的碳纤维电极安置入该针型参比电极内构成复合针型微PH传感器。该传感器成功地应用于在体PH测定以及水果内微区PH测定。 相似文献
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化学传感器和纳米传感器新材料的应用现状 总被引:2,自引:0,他引:2
对近年来化学传感器的应用和纳米传感器材料制备的进展作了评述。特别对一些新型化学传感器的应用及纳米传感新材料制备的新发展作了重点介绍。引述文献31篇。 相似文献
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小型管道PH传感器的研制及其手自动化在线监测中的应用 总被引:1,自引:0,他引:1
研制了数种结构简单,实用的小型管玻璃膜PH传感器和小型管道PVC膜PH传感器,并将其与普通的酸度计和自动采样器等合理组合,构成了自动采样酸度在线监测装置,该装置与计算机自动化控制系统联网,已用于稀土萃取分离槽液的酸度自动化在线监测,结果满意。 相似文献
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对映体选择性化学传感器的研究是化学传感器研究领域新的重要课题。本文作为作者关于这一课题研究报道的开篇,综述了具有手性识别功能的对映体选择性化学传感器和作为其敏感材料的手性识别载体的研究概况,概述了其发展方面及有关问题,收引参考文献67篇。 相似文献
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综述了普鲁士蓝化学传感器的研究和应用进展。介绍了传感器敏感膜的制备方法,在电化学传感器和光学传感器中的应用及机理研究方面的成果。普鲁士蓝优越的氧化还原性质使普鲁士蓝化学传感器对于许多物质的检测有着重要的意义。 相似文献
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作为半径最小的阴离子,氟离子(F-)表现出高电负性和强碱性,因而具有特殊的化学性质。由于F-与人类健康和环境安全密切相关,因此它的识别与检测已引起了人们极大的关注。到目前为止,用于选择性检测F-的荧光化学传感器已有大量报道,这些传感器主要是基于有机硼化合物和氢键质子给体。与这些传感器相比,反应型传感器具有更高的选择性,并且更容易在水环境中实现F-检测。本文根据有机硅化合物的结构不同,分别综述了近年来基于硅醚、硅炔及其他有机硅化合物的反应型氟离子荧光化学传感器的合成研究进展,其中包括本课题组的一些研究工作。 相似文献
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J. A. Hodgeson 《International journal of environmental analytical chemistry》2013,93(2):113-132
Abstract Instrumental and manual methods currently available for the measurement of atmospheric oxidants are surveyed. Techniques used in the United States are emphasized and their advantages and disadvantages are discussed. Commercial systems are evaluated in terms of general operating principles rather than of specific instruments. The ability of these techniques to meet the measurement requirements defined by U.S. Federal air quality oxidant criteria are discussed. Alternative chemical techniques that may have some advantages over the neutral, buffered KI procedure are discussed. Also some attractive, alternative instrumental procedures that are ozone-specific are presented. These systems are based on chemiluminescence and ultraviolet absorption photometry. Electrochemical and colorimetric methods for total oxidant measurements are compared. Finally, some data are presented on relationships of ozone and total oxidants. 相似文献
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《Physics and Chemistry of Liquids》2012,50(6):561-568
Measurements of densities, speeds of sound, excess volumes and viscosities of binary mixture of methyl tert-butyl ether with tetralin and decalin are reported at 303.15?K over the entire range of composition. Excess volumes are measured using batch dilatometer technique. Sound speeds are obtained using ultrasonic interferometer. Densities are computed from excess volume data. Isentropic compressibilities are derived from density and sound speed data. Speeds of sound are evaluated on the basis of Jacobson's free length theory and Schaff's collision factor theory. The predicted values are in good agreement with the experimental results. The viscosity data are analysed on the basis of corresponding states approach. Excess volumes and deviation in isentropic compressibilities are negative and deviation in viscosities are positive over the entire composition range. The experimental results are discussed in terms of possible molecular interactions between unlike molecules. 相似文献
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《印度化学会志》2023,100(2):100871
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Ng Seik Weng 《结构化学》2005,24(12):1425-1439
1 INTRODUCTION finement stage. The person performing the crysta- llographic manipulations works on numerical data The high degree of order in the arrangement of that are quite different from the diffraction images atoms in a crystal is a fundamental characteristic of on a computer terminal, and most often does not even the crystalline state, an ideal crystal being envisaged see the images. to be constructed of regularly-stacked unit cells, each The refinement program, SHELXL-97[1], has … 相似文献
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Different methods for construction of contactless conductivity detectors (CCD) for microchip electrophoresis device are described in this review. This includes three main schemes of CCD for microchips, such as (i) the detection electrodes are placed along the microchannel from outside of the microchip and they are insulated from the channel by the cover lid of microchip device; (ii) the electrodes are placed across of the microchannel in the same plane and they are insulated by thin separation channel walls and (iii) electrodes are buried in widened part of microchannel and they are insulated from solution by ultrathin layer of silicon carbide. Specific issues related to the CCD on microfluidics are discussed, such as an influence of shape and magnitude of ac voltage and placement of electrodes and their insulation. Various applications for security, pharmacological, bioassays and food analysis purposes are described. 相似文献
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Inorganic electrides are a novel kind of ionic compounds in which the anions are electrons confined in a complex array of cavities or channels and the cations are nanoscale arrays of alkali metal ions that provide charge balance. In electrides the donated electron behaves like a low-density correlated electron gas, whereby the dimensionality of the electron gas and its electronic and magnetic properties are determined by the topology of the cavities in the host matrix. Unlike traditional electrides, in which alkali cations are encapsulated within an organic cage, inorganic electrides are thermally stable. The current inorganic electrides based on alkali metal loaded zeolites can be designed as useful reduced-dimensionality materials. Inorganic electrides are powerful reducing agents, and they are able to reduce small aromatic molecules to the radical anions within the channels of the zeolite. 相似文献
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Pterins are bicyclic heterocycles that are found widely across Nature and are involved in a variety of biological functions. Notably, pterins are found at the core of molybdenum cofactor (Moco) containing enzymes in the molybdopterin (MPT) ligand that coordinates molybdenum and facilitates cofactor activity. Pterins are diverse and can be widely functionalized to tune their properties. Herein, the general methods of synthesis, redox and spectroscopic properties of pterin are discussed to provide more insight into pterin chemistry and their importance to biological systems. 相似文献
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纳米SiO2的表面处理及其在聚合物基纳米复合材料中的应用进展 总被引:27,自引:0,他引:27
简要介绍了纳米二氧化硅(SiO2)粒子的制备方法、结构和特性,对近年来国内外纳米SiO2的表面处理方法及聚合物/SiO2纳米复合材料的制备方法进行了阐述,并针对不同改性方法和制备方法的特点加以分析比较;讨论了SiO2粒子的分散机理和增强机理,并对未来的研究内容及方向提出展望。 相似文献
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Meera Mehta Jose M. Goicoechea 《Angewandte Chemie (International ed. in English)》2020,59(7):2715-2719
Molecular compounds featuring nitrogen atoms are typically regarded as Lewis bases and are extensively employed as donor ligands in coordination chemistry or as nucleophiles in organic chemistry. By contrast, electrophilic nitrogen‐containing compounds are much rarer. Nitrenium cations are a new family of nitrogen‐based Lewis acids, the reactivity of which remains largely unexplored. In this work, nitrenium ions are explored as catalysts in five organic transformations. These reactions are the first examples of Lewis acid catalysis employing nitrogen as the site of substrate activation. Moreover, these compounds are readily accessed from commercially available reagents and exhibit remarkable stability toward moisture, allowing for benchtop transformations without the need to pretreat solvents. 相似文献