15 research outputs found

    典型高温薄膜传感器的研究进展

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    随着航空发动机、燃气轮机、内燃机、石油化工设备等的设计、运行要求不断提高,对典型高温薄膜传感器如高温薄膜应变计、高温薄膜温度计、高温薄膜热流量计的需求越来越迫切。文中介绍了高温薄膜应变计、高温薄膜温度计、高温薄膜热流量计以及多功能集成高温薄膜传感器等典型高温薄膜传感器的研究现状,分析了它们在敏感材料、材料体系、制造工艺和信号传输方面存在的主要问题,可为应用于更严酷环境的高温薄膜传感器的技术研究提供参考

    Experimental Study on Tip-Induced Electrospinning

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    针尖诱导电纺技术(TIE)利用针尖阵列插入聚合物溶液表面后快速抽离,由于高压强电场和黏性力作用在液面抽离处诱导形成泰勒锥,进而在收集板上得到大量纳米纤维,实现纳米纤维的批量制造.实验结果表明在不同电极间距下,电纺阈值电压随着溶液浓度的增加而增大.当工作电压为63 kV,溶液槽尺寸为142 MMx50 MM时,电纺聚氧化乙烯(PEO)溶液的纤维产量达1.961 2 g/H.当工作电压从45 kV增加到63 kV时,纤维沉积均匀性变化范围为31.08%~43.23%.Tip-induced electrospinning(TIE) is demonstrated to produce nanofibers with high throughput.Probe array was plunged into the plane polymer solution and then withdrawn quickly,and due to the effects of viscous force and the electric force,Taylor cones were generated from the position where the probes left,and then mass nanofibers were obtained on the collector.The experimental results show that the threshold voltage under different electrode distances increases with the increase of the concentration,and the mean throughput of polyethylene oxide(PEO) nanofibers is up to 1.961 2 g / h when the solution tank size is 142 mm × 50 mm and the applied voltage is 63 kV.And the maximum deposition error of nanofibers is within the range of 31.08% —43.23% on the condition that the applied voltage changes from 45 kV to 63 kV.国家自然科学基金重点资助项目(51035002); 国家自然科学基金资助项目(51205334); 福建省自然科学基金资助项目(2011J05139

    Continuous Tipless Electrospinning with Rotatory Electrode

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    连续供液的旋转电极式无针尖静电纺丝采用圆柱滚筒电极代替喷丝头实现了高产量纳米纤维制造.该方法避免了喷丝头的堵塞问题,同时也实现了纳米纤维的连续生产.本文利用扫描电镜(SEM)探讨了该制作过程中的关键参数,如溶液浓度、偏置电压、旋转速度以及溶液厚度等对纳米纤维直径的影响.实验结果表明,纳米纤维的平均直径随溶液浓度、圆柱滚筒电极旋转速度和溶液厚度的增大而增大,但随着偏置电压、圆柱滚筒电极直径的增大而减小.圆柱滚筒电极长度为12 CM、直径为60 MM时制备的纳米纤维产量高达8.7 g/H,且纳米纤维的直径均小于500 nM.Tipless electrospinning with rotatory electrode and continuous supply polymer solution,which uses a cylindrical-shape rotatory electrode to replace syringe spinneret,is a novel method for massive production of nanofibers.It not only avoids the blockage of spinneret but also realizes the continuous production of nanofibers.In this paper,the effects of some key parameters such as solution concentration,applied bias voltage,rotatory speed and thickness of solution on the diameter of nanofibers were discussed via scanning electron microscope( SEM).The results demonstrate that the mean diameter of electrospun nanofibers increases with the increase of solution concentration,rotatory speed of cylindrical-shape rotatory electrode and thickness of solution,but decreases with the increase of applied bias voltage and diameter of cylindrical-shape rotatory electrode.The output of nanofibers achieved 8.7 g / h for a cylindricalshape rotatory electrode( 12 cm in length and 60 mm in diameter),and the diameters of nanofibers were less than 500 nm.supportedbyKeyProgramofNationalNaturalScienceFoundationofChina(51035002);theNationalNaturalScienceFoundationofChina(51205334); theNaturalScienceFoundationofFujianProvinceofChina(2011J05139)~

    荧光碳点在活细胞核仁成像或RNA标记或显示中的应用

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    本发明公开了一种荧光碳点在活细胞核仁成像或RNA标记或显示中的应用。所述荧光碳点采用具有上下转化功能的红光发射荧光碳点,特别是CN104263366A中公开的荧光碳点。在一些实施例中,可以通过培养细胞、配制染料溶液、染色、成像,完成使用荧光碳点对活细胞的核仁成像。藉由本发明,可实现对活细胞核仁的成像或对活细胞中RNA的标记或显示,且对核仁成像的选择性高、成像分辨率高,同时具有简单快速、成本低,对生物毒性低等特点,具有很高的实用价值

    过氧亚硝酸根离子检测探针、其制备方法及应用

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    本发明公开了一种过氧亚硝酸根离子检测探针、其制备方法及应用。该检测探针包括:荧光纳米材料,以及与之结合的具有氧化还原性的酶;所述的酶能够被过氧亚硝酸根离子选择性氧化形成氧化态的酶,且当所述荧光纳米材料在被激发光辐射后,处于激发态的电子会被转移至所述氧化态的酶而不能回到基态,导致所述荧光纳米材料的荧光淬灭。本发明提供的过氧亚硝酸根离子检测探针采用无机发光材料作为荧光团,其发光强,稳定性好,不易光漂白,且在其表面修饰具有氧化还原性的酶后,能够被ONOO‑选择性氧化,同时不会受到其他活性氧(ROS)或活性氮(RNS)的干扰,具有优良的特异性

    检测O<sub>2<-sub>·<sup>-<-sup>的荧光分子探针、其合成方法和应用

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    本发明公开了一种检测超氧阴离子自由基(O2·-)的荧光分子探针,其具有下式所示结构:式中,R为氨基烷基或C1~C12的直链烷基,n选自0~2中的任一整数。同时,本发明还提供了合成所述荧光分子探针的方法以及利用所述荧光分子探针检测超氧阴离子自由基的方法。本发明的荧光分子探针对于低浓度、活性高及寿命短的超氧阴离子自由基可以实现快速准确的响应,并且灵敏度(检测限可低至222nM)和选择性高,同时可以应用于水相体系,具有良好的应用前景,另外,本发明荧光分子探针的合成工艺简单,反应条件温和,适于规模化生产
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