共查询到19条相似文献，搜索用时 562 毫秒
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目的：制备了萘酚-多壁碳纳米管电极（Nafion-MWCNTs/GCE）,研究人乳腺癌细胞MCF-7的循环伏安行为,以及在不同的富集时间、富集电位及扫速对人乳腺癌细胞MCF-7的电化学影响。方法：使用滴涂法制备Nafion-MWCNTs/GCE修饰玻碳电极。采用循环伏安法研究Nafion-MWCNTs/GCE对MCF-7的电催化性质。结果：发现富集时间、富集电位和扫速对MCF-7的氧化还原峰的峰形,峰位有很大影响。结论：MCF-7在Nafion-MWCNTs/GCE上有灵敏的氧化还原峰,Nafion-MWCNTs/GCE对MCF-7具有良好的催化作用。 相似文献
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以电化学沉积法在玻碳电极上修饰纳米金颗粒,以修饰后的电极作为工作电极,用于同位镀铋膜法连续测定水中铅的含量。在含铋的溶液中,采用示差脉冲溶出伏安法测定铅离子的浓度,考察电解液pH值、富集电位、富集时间及铋膜浓度对溶出峰的影响,优化出最佳实验条件。在优化的实验条件下,金属离子浓度和峰电流有较好的线性关系,结果表明,本法测定结果准确度,灵敏度较高,重现性良好,可实现水中微量重金属离子的快速测定。 相似文献
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设计了适用于仿生机器人系统的离子型电活性聚合物柔性驱动器结构,采用溶胶-凝胶法制备新型离子液体聚合物凝胶,涂布法制备活性炭电极,并组装成柔性驱动器。利用扫描电镜表征驱动器的微观结构,结合循环伏安法分析电化学性能,根据应力-应变曲线求出杨氏模量。在分析驱动器致动机理的基础上,对其驱动性能进行测试,结果表明研制的新型柔性驱动器在仿生机器人领域有很好的应用潜力。 相似文献
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《Journal of The Franklin Institute》2003,340(3-4):221-242
The Franklin Institute, Philadelphia, Pennsylvania, awarded the 2002 Benjamin Franklin Medal in physics to Sumio Iijima for his discovery and elucidation of the atomic structure and helical character of multi- and single-wall carbon nanotubes. His pioneering work created a new, tremendously active and expanding area in the field of nanoscience and technology that involves condensed matter and material scientists, chemists and computer scientists. Iijima has also made key contributions to the mechanisms that are involved in the growth of carbon nanotubes, to the role of pentagonal and heptagonal carbon rings in the formation of caps that form at the ends of the nanotubes and to the encapsulation of molecules within the nanotubes. 相似文献
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用蒙脱土制备了蒙脱土/SnO_2/染料(靛蓝胭脂红)化学修饰电极.循环伏安图表明,有机染料分子可以持留在蒙脱上膜中,并显示出电化学活性.用蒙脱土制备的化学修饰电极(CME)可以很大地改进电极反应的稳定性.电活性物在蒙脱土膜中的电化学行为是受扩散控制的.测得扩散系数的数量级为10~(-10)cm~2/s.所制得的蒙脱土/SnO_2/染料化学修饰电极对抗坏血酸的电化学氧化显示电催化作用,使它的氧化电位降低了100mV. 相似文献
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Junya Suehiro 《Biomicrofluidics》2010,4(2)
Dielectrophoresis (DEP) is an electrokinetic motion of dielectrically polarized materials in nonuniform electric fields. DEP has been successfully applied to manipulation of nanomaterials including carbon nanotubes (CNTs), metallic nanoparticles, and semiconducting nanowires. Under positive DEP force, which attracts nanomaterials toward the higher field region, nanomaterials are trapped in the electrode gap and automatically establish good electrical connections between them and the external measuring circuit. This feature allows us a fast, simple, and low-cost fabrication of nanomaterial-based sensors based on a bottom-up approach. This paper first presents a theoretical background of DEP phenomena and then reviews recent works of the present author, which were aimed to develop nanomaterial-based sensors, such as a CNT gas sensor and a ZnO nanowire photosensor, using DEP fabrication technique. It is also demonstrated that DEP technique enables self-formation of interfaces between various nanomaterials, which can be also applicable as novel sensing transducers. 相似文献
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Frank F Yun Zhenwei Yu Yahua He Lei Jiang Zhao Wang Haoshuang Gu Xiaolin Wang 《国家科学评论(英文版)》2020,7(2):366
Room-temperature liquid metal is discovered to be capable of penetrating through macro- and microporous materials by applying a voltage. The liquid metal penetration effects are demonstrated in various porous materials such as tissue paper, thick and fine sponges, fabrics, and meshes. The underlying mechanism is that the high surface tension of liquid metal can be significantly reduced to near-zero due to the voltage-induced oxidation of the liquid metal surface in a solution. It is the extremely low surface tension and gravity that cause the liquid metal to superwet the solid surface, leading to the penetration phenomena. These findings offer new opportunities for novel microfluidic applications and could promote further discovery of more exotic fluid states of liquid metals. 相似文献
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《中国科学院院刊(英文版)》2004,18(4):201-201
One-dimensional carbon nanotubes (CNT) have received considerable attention from researchers worldwide. It is not only because of their unique physical properties, but also their potential applications. Recently, researchers of the CAS Institute of Physics have made new progress in the field. 相似文献
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Ronald Pethig 《Biomicrofluidics》2010,4(2)
A review is presented of the present status of the theory, the developed technology and the current applications of dielectrophoresis (DEP). Over the past 10 years around 2000 publications have addressed these three aspects, and current trends suggest that the theory and technology have matured sufficiently for most effort to now be directed towards applying DEP to unmet needs in such areas as biosensors, cell therapeutics, drug discovery, medical diagnostics, microfluidics, nanoassembly, and particle filtration. The dipole approximation to describe the DEP force acting on a particle subjected to a nonuniform electric field has evolved to include multipole contributions, the perturbing effects arising from interactions with other cells and boundary surfaces, and the influence of electrical double-layer polarizations that must be considered for nanoparticles. Theoretical modelling of the electric field gradients generated by different electrode designs has also reached an advanced state. Advances in the technology include the development of sophisticated electrode designs, along with the introduction of new materials (e.g., silicone polymers, dry film resist) and methods for fabricating the electrodes and microfluidics of DEP devices (photo and electron beam lithography, laser ablation, thin film techniques, CMOS technology). Around three-quarters of the 300 or so scientific publications now being published each year on DEP are directed towards practical applications, and this is matched with an increasing number of patent applications. A summary of the US patents granted since January 2005 is given, along with an outline of the small number of perceived industrial applications (e.g., mineral separation, micropolishing, manipulation and dispensing of fluid droplets, manipulation and assembly of micro components). The technology has also advanced sufficiently for DEP to be used as a tool to manipulate nanoparticles (e.g., carbon nanotubes, nano wires, gold and metal oxide nanoparticles) for the fabrication of devices and sensors. Most efforts are now being directed towards biomedical applications, such as the spatial manipulation and selective separation∕enrichment of target cells or bacteria, high-throughput molecular screening, biosensors, immunoassays, and the artificial engineering of three-dimensional cell constructs. DEP is able to manipulate and sort cells without the need for biochemical labels or other bioengineered tags, and without contact to any surfaces. This opens up potentially important applications of DEP as a tool to address an unmet need in stem cell research and therapy. 相似文献
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运用专利计量与信息可视化技术手段,对会聚技术进行测度与可视化分析,是一个较新的研究课题。对纳米-生物(NB)会聚技术测度与可视化分析的结果显示,2000-2009年间,NB会聚技术呈现出快速发展的势头;NB会聚技术共涉及到4 998个不同的技术小类,其中"细菌、真菌、病毒等的测试与探测技术"是最重要的领域;NB会聚技术的热点主题,主要集中在核酸、碳纳米管、制备方法、生物标本、癌症治疗、靶标分子等方面。中国政府和科学技术界,应通过加强纳米与生物技术领域的合作,拓展纳米与生物技术的合作领域和合作主题,培养更多的NB会聚技术领域人才等途径,推动中国NB会聚技术的不断发展。NB会聚技术的测度与可视化分析方法,可应用于其他会聚技术领域。 相似文献